ICD-10-CM category M05

Rheumatoid arthritis with rheumatoid factor: every M05 code with its CMS-HCC V28 status

M05, Rheumatoid arthritis with rheumatoid factor, holds 284 codes in the FY2026 ICD-10-CM set: 211 billable codes and 73 header codes that need a further character. Every one of them maps to a CMS-HCC V28 payment category (HCC 93) for payment year 2026.

M05211 billable codes (FY2026)211 map to CMS-HCC V28

CMS-HCC V28 categories in M05 (1)

Coefficients are the code-level reference values from the CMS V28 factor file (community, non-dual, aged), not a member's score. Hierarchy, interactions, and enrollment segment decide what a documented condition contributes.

HCC 93 Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders211 codes · ref. 0.617

All 284 M05 codes (FY2026)

Descriptors are the FY2026 order-file text. Header codes need a further character and cannot be reported; open any billable code for its tabular notes, MEAT guidance, and mapping detail.

Code	Description	FY2026	CMS-HCC V28
M05	Rheumatoid arthritis with rheumatoid factor	Header	Header code, not reportable
M05.0	Felty's syndrome	Header	Header code, not reportable
M05.00	Felty's syndrome, unspecified site	Billable	HCC 93
M05.01	Felty's syndrome, shoulder	Header	Header code, not reportable
M05.011	Felty's syndrome, right shoulder	Billable	HCC 93
M05.012	Felty's syndrome, left shoulder	Billable	HCC 93
M05.019	Felty's syndrome, unspecified shoulder	Billable	HCC 93
M05.02	Felty's syndrome, elbow	Header	Header code, not reportable
M05.021	Felty's syndrome, right elbow	Billable	HCC 93
M05.022	Felty's syndrome, left elbow	Billable	HCC 93
M05.029	Felty's syndrome, unspecified elbow	Billable	HCC 93
M05.03	Felty's syndrome, wrist	Header	Header code, not reportable
M05.031	Felty's syndrome, right wrist	Billable	HCC 93
M05.032	Felty's syndrome, left wrist	Billable	HCC 93
M05.039	Felty's syndrome, unspecified wrist	Billable	HCC 93
M05.04	Felty's syndrome, hand	Header	Header code, not reportable
M05.041	Felty's syndrome, right hand	Billable	HCC 93
M05.042	Felty's syndrome, left hand	Billable	HCC 93
M05.049	Felty's syndrome, unspecified hand	Billable	HCC 93
M05.05	Felty's syndrome, hip	Header	Header code, not reportable
M05.051	Felty's syndrome, right hip	Billable	HCC 93
M05.052	Felty's syndrome, left hip	Billable	HCC 93
M05.059	Felty's syndrome, unspecified hip	Billable	HCC 93
M05.06	Felty's syndrome, knee	Header	Header code, not reportable
M05.061	Felty's syndrome, right knee	Billable	HCC 93
M05.062	Felty's syndrome, left knee	Billable	HCC 93
M05.069	Felty's syndrome, unspecified knee	Billable	HCC 93
M05.07	Felty's syndrome, ankle and foot	Header	Header code, not reportable
M05.071	Felty's syndrome, right ankle and foot	Billable	HCC 93
M05.072	Felty's syndrome, left ankle and foot	Billable	HCC 93
M05.079	Felty's syndrome, unspecified ankle and foot	Billable	HCC 93
M05.09	Felty's syndrome, multiple sites	Billable	HCC 93
M05.1	Rheumatoid lung disease with rheumatoid arthritis	Header	Header code, not reportable
M05.10	Rheumatoid lung disease with rheumatoid arthritis of unspecified site	Billable	HCC 93
M05.11	Rheumatoid lung disease with rheumatoid arthritis of shoulder	Header	Header code, not reportable
M05.111	Rheumatoid lung disease with rheumatoid arthritis of right shoulder	Billable	HCC 93
M05.112	Rheumatoid lung disease with rheumatoid arthritis of left shoulder	Billable	HCC 93
M05.119	Rheumatoid lung disease with rheumatoid arthritis of unspecified shoulder	Billable	HCC 93
M05.12	Rheumatoid lung disease with rheumatoid arthritis of elbow	Header	Header code, not reportable
M05.121	Rheumatoid lung disease with rheumatoid arthritis of right elbow	Billable	HCC 93
M05.122	Rheumatoid lung disease with rheumatoid arthritis of left elbow	Billable	HCC 93
M05.129	Rheumatoid lung disease with rheumatoid arthritis of unspecified elbow	Billable	HCC 93
M05.13	Rheumatoid lung disease with rheumatoid arthritis of wrist	Header	Header code, not reportable
M05.131	Rheumatoid lung disease with rheumatoid arthritis of right wrist	Billable	HCC 93
M05.132	Rheumatoid lung disease with rheumatoid arthritis of left wrist	Billable	HCC 93
M05.139	Rheumatoid lung disease with rheumatoid arthritis of unspecified wrist	Billable	HCC 93
M05.14	Rheumatoid lung disease with rheumatoid arthritis of hand	Header	Header code, not reportable
M05.141	Rheumatoid lung disease with rheumatoid arthritis of right hand	Billable	HCC 93
M05.142	Rheumatoid lung disease with rheumatoid arthritis of left hand	Billable	HCC 93
M05.149	Rheumatoid lung disease with rheumatoid arthritis of unspecified hand	Billable	HCC 93
M05.15	Rheumatoid lung disease with rheumatoid arthritis of hip	Header	Header code, not reportable
M05.151	Rheumatoid lung disease with rheumatoid arthritis of right hip	Billable	HCC 93
M05.152	Rheumatoid lung disease with rheumatoid arthritis of left hip	Billable	HCC 93
M05.159	Rheumatoid lung disease with rheumatoid arthritis of unspecified hip	Billable	HCC 93
M05.16	Rheumatoid lung disease with rheumatoid arthritis of knee	Header	Header code, not reportable
M05.161	Rheumatoid lung disease with rheumatoid arthritis of right knee	Billable	HCC 93
M05.162	Rheumatoid lung disease with rheumatoid arthritis of left knee	Billable	HCC 93
M05.169	Rheumatoid lung disease with rheumatoid arthritis of unspecified knee	Billable	HCC 93
M05.17	Rheumatoid lung disease with rheumatoid arthritis of ankle and foot	Header	Header code, not reportable
M05.171	Rheumatoid lung disease with rheumatoid arthritis of right ankle and foot	Billable	HCC 93
M05.172	Rheumatoid lung disease with rheumatoid arthritis of left ankle and foot	Billable	HCC 93
M05.179	Rheumatoid lung disease with rheumatoid arthritis of unspecified ankle and foot	Billable	HCC 93
M05.19	Rheumatoid lung disease with rheumatoid arthritis of multiple sites	Billable	HCC 93
M05.2	Rheumatoid vasculitis with rheumatoid arthritis	Header	Header code, not reportable
M05.20	Rheumatoid vasculitis with rheumatoid arthritis of unspecified site	Billable	HCC 93
M05.21	Rheumatoid vasculitis with rheumatoid arthritis of shoulder	Header	Header code, not reportable
M05.211	Rheumatoid vasculitis with rheumatoid arthritis of right shoulder	Billable	HCC 93
M05.212	Rheumatoid vasculitis with rheumatoid arthritis of left shoulder	Billable	HCC 93
M05.219	Rheumatoid vasculitis with rheumatoid arthritis of unspecified shoulder	Billable	HCC 93
M05.22	Rheumatoid vasculitis with rheumatoid arthritis of elbow	Header	Header code, not reportable
M05.221	Rheumatoid vasculitis with rheumatoid arthritis of right elbow	Billable	HCC 93
M05.222	Rheumatoid vasculitis with rheumatoid arthritis of left elbow	Billable	HCC 93
M05.229	Rheumatoid vasculitis with rheumatoid arthritis of unspecified elbow	Billable	HCC 93
M05.23	Rheumatoid vasculitis with rheumatoid arthritis of wrist	Header	Header code, not reportable
M05.231	Rheumatoid vasculitis with rheumatoid arthritis of right wrist	Billable	HCC 93
M05.232	Rheumatoid vasculitis with rheumatoid arthritis of left wrist	Billable	HCC 93
M05.239	Rheumatoid vasculitis with rheumatoid arthritis of unspecified wrist	Billable	HCC 93
M05.24	Rheumatoid vasculitis with rheumatoid arthritis of hand	Header	Header code, not reportable
M05.241	Rheumatoid vasculitis with rheumatoid arthritis of right hand	Billable	HCC 93
M05.242	Rheumatoid vasculitis with rheumatoid arthritis of left hand	Billable	HCC 93
M05.249	Rheumatoid vasculitis with rheumatoid arthritis of unspecified hand	Billable	HCC 93
M05.25	Rheumatoid vasculitis with rheumatoid arthritis of hip	Header	Header code, not reportable
M05.251	Rheumatoid vasculitis with rheumatoid arthritis of right hip	Billable	HCC 93
M05.252	Rheumatoid vasculitis with rheumatoid arthritis of left hip	Billable	HCC 93
M05.259	Rheumatoid vasculitis with rheumatoid arthritis of unspecified hip	Billable	HCC 93
M05.26	Rheumatoid vasculitis with rheumatoid arthritis of knee	Header	Header code, not reportable
M05.261	Rheumatoid vasculitis with rheumatoid arthritis of right knee	Billable	HCC 93
M05.262	Rheumatoid vasculitis with rheumatoid arthritis of left knee	Billable	HCC 93
M05.269	Rheumatoid vasculitis with rheumatoid arthritis of unspecified knee	Billable	HCC 93
M05.27	Rheumatoid vasculitis with rheumatoid arthritis of ankle and foot	Header	Header code, not reportable
M05.271	Rheumatoid vasculitis with rheumatoid arthritis of right ankle and foot	Billable	HCC 93
M05.272	Rheumatoid vasculitis with rheumatoid arthritis of left ankle and foot	Billable	HCC 93
M05.279	Rheumatoid vasculitis with rheumatoid arthritis of unspecified ankle and foot	Billable	HCC 93
M05.29	Rheumatoid vasculitis with rheumatoid arthritis of multiple sites	Billable	HCC 93
M05.3	Rheumatoid heart disease with rheumatoid arthritis	Header	Header code, not reportable
M05.30	Rheumatoid heart disease with rheumatoid arthritis of unspecified site	Billable	HCC 93
M05.31	Rheumatoid heart disease with rheumatoid arthritis of shoulder	Header	Header code, not reportable
M05.311	Rheumatoid heart disease with rheumatoid arthritis of right shoulder	Billable	HCC 93
M05.312	Rheumatoid heart disease with rheumatoid arthritis of left shoulder	Billable	HCC 93
M05.319	Rheumatoid heart disease with rheumatoid arthritis of unspecified shoulder	Billable	HCC 93
M05.32	Rheumatoid heart disease with rheumatoid arthritis of elbow	Header	Header code, not reportable
M05.321	Rheumatoid heart disease with rheumatoid arthritis of right elbow	Billable	HCC 93
M05.322	Rheumatoid heart disease with rheumatoid arthritis of left elbow	Billable	HCC 93
M05.329	Rheumatoid heart disease with rheumatoid arthritis of unspecified elbow	Billable	HCC 93
M05.33	Rheumatoid heart disease with rheumatoid arthritis of wrist	Header	Header code, not reportable
M05.331	Rheumatoid heart disease with rheumatoid arthritis of right wrist	Billable	HCC 93
M05.332	Rheumatoid heart disease with rheumatoid arthritis of left wrist	Billable	HCC 93
M05.339	Rheumatoid heart disease with rheumatoid arthritis of unspecified wrist	Billable	HCC 93
M05.34	Rheumatoid heart disease with rheumatoid arthritis of hand	Header	Header code, not reportable
M05.341	Rheumatoid heart disease with rheumatoid arthritis of right hand	Billable	HCC 93
M05.342	Rheumatoid heart disease with rheumatoid arthritis of left hand	Billable	HCC 93
M05.349	Rheumatoid heart disease with rheumatoid arthritis of unspecified hand	Billable	HCC 93
M05.35	Rheumatoid heart disease with rheumatoid arthritis of hip	Header	Header code, not reportable
M05.351	Rheumatoid heart disease with rheumatoid arthritis of right hip	Billable	HCC 93
M05.352	Rheumatoid heart disease with rheumatoid arthritis of left hip	Billable	HCC 93
M05.359	Rheumatoid heart disease with rheumatoid arthritis of unspecified hip	Billable	HCC 93
M05.36	Rheumatoid heart disease with rheumatoid arthritis of knee	Header	Header code, not reportable
M05.361	Rheumatoid heart disease with rheumatoid arthritis of right knee	Billable	HCC 93
M05.362	Rheumatoid heart disease with rheumatoid arthritis of left knee	Billable	HCC 93
M05.369	Rheumatoid heart disease with rheumatoid arthritis of unspecified knee	Billable	HCC 93
M05.37	Rheumatoid heart disease with rheumatoid arthritis of ankle and foot	Header	Header code, not reportable
M05.371	Rheumatoid heart disease with rheumatoid arthritis of right ankle and foot	Billable	HCC 93
M05.372	Rheumatoid heart disease with rheumatoid arthritis of left ankle and foot	Billable	HCC 93
M05.379	Rheumatoid heart disease with rheumatoid arthritis of unspecified ankle and foot	Billable	HCC 93
M05.39	Rheumatoid heart disease with rheumatoid arthritis of multiple sites	Billable	HCC 93
M05.4	Rheumatoid myopathy with rheumatoid arthritis	Header	Header code, not reportable
M05.40	Rheumatoid myopathy with rheumatoid arthritis of unspecified site	Billable	HCC 93
M05.41	Rheumatoid myopathy with rheumatoid arthritis of shoulder	Header	Header code, not reportable
M05.411	Rheumatoid myopathy with rheumatoid arthritis of right shoulder	Billable	HCC 93
M05.412	Rheumatoid myopathy with rheumatoid arthritis of left shoulder	Billable	HCC 93
M05.419	Rheumatoid myopathy with rheumatoid arthritis of unspecified shoulder	Billable	HCC 93
M05.42	Rheumatoid myopathy with rheumatoid arthritis of elbow	Header	Header code, not reportable
M05.421	Rheumatoid myopathy with rheumatoid arthritis of right elbow	Billable	HCC 93
M05.422	Rheumatoid myopathy with rheumatoid arthritis of left elbow	Billable	HCC 93
M05.429	Rheumatoid myopathy with rheumatoid arthritis of unspecified elbow	Billable	HCC 93
M05.43	Rheumatoid myopathy with rheumatoid arthritis of wrist	Header	Header code, not reportable
M05.431	Rheumatoid myopathy with rheumatoid arthritis of right wrist	Billable	HCC 93
M05.432	Rheumatoid myopathy with rheumatoid arthritis of left wrist	Billable	HCC 93
M05.439	Rheumatoid myopathy with rheumatoid arthritis of unspecified wrist	Billable	HCC 93
M05.44	Rheumatoid myopathy with rheumatoid arthritis of hand	Header	Header code, not reportable
M05.441	Rheumatoid myopathy with rheumatoid arthritis of right hand	Billable	HCC 93
M05.442	Rheumatoid myopathy with rheumatoid arthritis of left hand	Billable	HCC 93
M05.449	Rheumatoid myopathy with rheumatoid arthritis of unspecified hand	Billable	HCC 93
M05.45	Rheumatoid myopathy with rheumatoid arthritis of hip	Header	Header code, not reportable
M05.451	Rheumatoid myopathy with rheumatoid arthritis of right hip	Billable	HCC 93
M05.452	Rheumatoid myopathy with rheumatoid arthritis of left hip	Billable	HCC 93
M05.459	Rheumatoid myopathy with rheumatoid arthritis of unspecified hip	Billable	HCC 93
M05.46	Rheumatoid myopathy with rheumatoid arthritis of knee	Header	Header code, not reportable
M05.461	Rheumatoid myopathy with rheumatoid arthritis of right knee	Billable	HCC 93
M05.462	Rheumatoid myopathy with rheumatoid arthritis of left knee	Billable	HCC 93
M05.469	Rheumatoid myopathy with rheumatoid arthritis of unspecified knee	Billable	HCC 93
M05.47	Rheumatoid myopathy with rheumatoid arthritis of ankle and foot	Header	Header code, not reportable
M05.471	Rheumatoid myopathy with rheumatoid arthritis of right ankle and foot	Billable	HCC 93
M05.472	Rheumatoid myopathy with rheumatoid arthritis of left ankle and foot	Billable	HCC 93
M05.479	Rheumatoid myopathy with rheumatoid arthritis of unspecified ankle and foot	Billable	HCC 93
M05.49	Rheumatoid myopathy with rheumatoid arthritis of multiple sites	Billable	HCC 93
M05.5	Rheumatoid polyneuropathy with rheumatoid arthritis	Header	Header code, not reportable
M05.50	Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified site	Billable	HCC 93
M05.51	Rheumatoid polyneuropathy with rheumatoid arthritis of shoulder	Header	Header code, not reportable
M05.511	Rheumatoid polyneuropathy with rheumatoid arthritis of right shoulder	Billable	HCC 93
M05.512	Rheumatoid polyneuropathy with rheumatoid arthritis of left shoulder	Billable	HCC 93
M05.519	Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified shoulder	Billable	HCC 93
M05.52	Rheumatoid polyneuropathy with rheumatoid arthritis of elbow	Header	Header code, not reportable
M05.521	Rheumatoid polyneuropathy with rheumatoid arthritis of right elbow	Billable	HCC 93
M05.522	Rheumatoid polyneuropathy with rheumatoid arthritis of left elbow	Billable	HCC 93
M05.529	Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified elbow	Billable	HCC 93
M05.53	Rheumatoid polyneuropathy with rheumatoid arthritis of wrist	Header	Header code, not reportable
M05.531	Rheumatoid polyneuropathy with rheumatoid arthritis of right wrist	Billable	HCC 93
M05.532	Rheumatoid polyneuropathy with rheumatoid arthritis of left wrist	Billable	HCC 93
M05.539	Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified wrist	Billable	HCC 93
M05.54	Rheumatoid polyneuropathy with rheumatoid arthritis of hand	Header	Header code, not reportable
M05.541	Rheumatoid polyneuropathy with rheumatoid arthritis of right hand	Billable	HCC 93
M05.542	Rheumatoid polyneuropathy with rheumatoid arthritis of left hand	Billable	HCC 93
M05.549	Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified hand	Billable	HCC 93
M05.55	Rheumatoid polyneuropathy with rheumatoid arthritis of hip	Header	Header code, not reportable
M05.551	Rheumatoid polyneuropathy with rheumatoid arthritis of right hip	Billable	HCC 93
M05.552	Rheumatoid polyneuropathy with rheumatoid arthritis of left hip	Billable	HCC 93
M05.559	Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified hip	Billable	HCC 93
M05.56	Rheumatoid polyneuropathy with rheumatoid arthritis of knee	Header	Header code, not reportable
M05.561	Rheumatoid polyneuropathy with rheumatoid arthritis of right knee	Billable	HCC 93
M05.562	Rheumatoid polyneuropathy with rheumatoid arthritis of left knee	Billable	HCC 93
M05.569	Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified knee	Billable	HCC 93
M05.57	Rheumatoid polyneuropathy with rheumatoid arthritis of ankle and foot	Header	Header code, not reportable
M05.571	Rheumatoid polyneuropathy with rheumatoid arthritis of right ankle and foot	Billable	HCC 93
M05.572	Rheumatoid polyneuropathy with rheumatoid arthritis of left ankle and foot	Billable	HCC 93
M05.579	Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified ankle and foot	Billable	HCC 93
M05.59	Rheumatoid polyneuropathy with rheumatoid arthritis of multiple sites	Billable	HCC 93
M05.6	Rheumatoid arthritis with involvement of other organs and systems	Header	Header code, not reportable
M05.60	Rheumatoid arthritis of unspecified site with involvement of other organs and systems	Billable	HCC 93
M05.61	Rheumatoid arthritis of shoulder with involvement of other organs and systems	Header	Header code, not reportable
M05.611	Rheumatoid arthritis of right shoulder with involvement of other organs and systems	Billable	HCC 93
M05.612	Rheumatoid arthritis of left shoulder with involvement of other organs and systems	Billable	HCC 93
M05.619	Rheumatoid arthritis of unspecified shoulder with involvement of other organs and systems	Billable	HCC 93
M05.62	Rheumatoid arthritis of elbow with involvement of other organs and systems	Header	Header code, not reportable
M05.621	Rheumatoid arthritis of right elbow with involvement of other organs and systems	Billable	HCC 93
M05.622	Rheumatoid arthritis of left elbow with involvement of other organs and systems	Billable	HCC 93
M05.629	Rheumatoid arthritis of unspecified elbow with involvement of other organs and systems	Billable	HCC 93
M05.63	Rheumatoid arthritis of wrist with involvement of other organs and systems	Header	Header code, not reportable
M05.631	Rheumatoid arthritis of right wrist with involvement of other organs and systems	Billable	HCC 93
M05.632	Rheumatoid arthritis of left wrist with involvement of other organs and systems	Billable	HCC 93
M05.639	Rheumatoid arthritis of unspecified wrist with involvement of other organs and systems	Billable	HCC 93
M05.64	Rheumatoid arthritis of hand with involvement of other organs and systems	Header	Header code, not reportable
M05.641	Rheumatoid arthritis of right hand with involvement of other organs and systems	Billable	HCC 93
M05.642	Rheumatoid arthritis of left hand with involvement of other organs and systems	Billable	HCC 93
M05.649	Rheumatoid arthritis of unspecified hand with involvement of other organs and systems	Billable	HCC 93
M05.65	Rheumatoid arthritis of hip with involvement of other organs and systems	Header	Header code, not reportable
M05.651	Rheumatoid arthritis of right hip with involvement of other organs and systems	Billable	HCC 93
M05.652	Rheumatoid arthritis of left hip with involvement of other organs and systems	Billable	HCC 93
M05.659	Rheumatoid arthritis of unspecified hip with involvement of other organs and systems	Billable	HCC 93
M05.66	Rheumatoid arthritis of knee with involvement of other organs and systems	Header	Header code, not reportable
M05.661	Rheumatoid arthritis of right knee with involvement of other organs and systems	Billable	HCC 93
M05.662	Rheumatoid arthritis of left knee with involvement of other organs and systems	Billable	HCC 93
M05.669	Rheumatoid arthritis of unspecified knee with involvement of other organs and systems	Billable	HCC 93
M05.67	Rheumatoid arthritis of ankle and foot with involvement of other organs and systems	Header	Header code, not reportable
M05.671	Rheumatoid arthritis of right ankle and foot with involvement of other organs and systems	Billable	HCC 93
M05.672	Rheumatoid arthritis of left ankle and foot with involvement of other organs and systems	Billable	HCC 93
M05.679	Rheumatoid arthritis of unspecified ankle and foot with involvement of other organs and systems	Billable	HCC 93
M05.69	Rheumatoid arthritis of multiple sites with involvement of other organs and systems	Billable	HCC 93
M05.7	Rheumatoid arthritis with rheumatoid factor without organ or systems involvement	Header	Header code, not reportable
M05.70	Rheumatoid arthritis with rheumatoid factor of unspecified site without organ or systems involvement	Billable	HCC 93
M05.71	Rheumatoid arthritis with rheumatoid factor of shoulder without organ or systems involvement	Header	Header code, not reportable
M05.711	Rheumatoid arthritis with rheumatoid factor of right shoulder without organ or systems involvement	Billable	HCC 93
M05.712	Rheumatoid arthritis with rheumatoid factor of left shoulder without organ or systems involvement	Billable	HCC 93
M05.719	Rheumatoid arthritis with rheumatoid factor of unspecified shoulder without organ or systems involvement	Billable	HCC 93
M05.72	Rheumatoid arthritis with rheumatoid factor of elbow without organ or systems involvement	Header	Header code, not reportable
M05.721	Rheumatoid arthritis with rheumatoid factor of right elbow without organ or systems involvement	Billable	HCC 93
M05.722	Rheumatoid arthritis with rheumatoid factor of left elbow without organ or systems involvement	Billable	HCC 93
M05.729	Rheumatoid arthritis with rheumatoid factor of unspecified elbow without organ or systems involvement	Billable	HCC 93
M05.73	Rheumatoid arthritis with rheumatoid factor of wrist without organ or systems involvement	Header	Header code, not reportable
M05.731	Rheumatoid arthritis with rheumatoid factor of right wrist without organ or systems involvement	Billable	HCC 93
M05.732	Rheumatoid arthritis with rheumatoid factor of left wrist without organ or systems involvement	Billable	HCC 93
M05.739	Rheumatoid arthritis with rheumatoid factor of unspecified wrist without organ or systems involvement	Billable	HCC 93
M05.74	Rheumatoid arthritis with rheumatoid factor of hand without organ or systems involvement	Header	Header code, not reportable
M05.741	Rheumatoid arthritis with rheumatoid factor of right hand without organ or systems involvement	Billable	HCC 93
M05.742	Rheumatoid arthritis with rheumatoid factor of left hand without organ or systems involvement	Billable	HCC 93
M05.749	Rheumatoid arthritis with rheumatoid factor of unspecified hand without organ or systems involvement	Billable	HCC 93
M05.75	Rheumatoid arthritis with rheumatoid factor of hip without organ or systems involvement	Header	Header code, not reportable
M05.751	Rheumatoid arthritis with rheumatoid factor of right hip without organ or systems involvement	Billable	HCC 93
M05.752	Rheumatoid arthritis with rheumatoid factor of left hip without organ or systems involvement	Billable	HCC 93
M05.759	Rheumatoid arthritis with rheumatoid factor of unspecified hip without organ or systems involvement	Billable	HCC 93
M05.76	Rheumatoid arthritis with rheumatoid factor of knee without organ or systems involvement	Header	Header code, not reportable
M05.761	Rheumatoid arthritis with rheumatoid factor of right knee without organ or systems involvement	Billable	HCC 93
M05.762	Rheumatoid arthritis with rheumatoid factor of left knee without organ or systems involvement	Billable	HCC 93
M05.769	Rheumatoid arthritis with rheumatoid factor of unspecified knee without organ or systems involvement	Billable	HCC 93
M05.77	Rheumatoid arthritis with rheumatoid factor of ankle and foot without organ or systems involvement	Header	Header code, not reportable
M05.771	Rheumatoid arthritis with rheumatoid factor of right ankle and foot without organ or systems involvement	Billable	HCC 93
M05.772	Rheumatoid arthritis with rheumatoid factor of left ankle and foot without organ or systems involvement	Billable	HCC 93
M05.779	Rheumatoid arthritis with rheumatoid factor of unspecified ankle and foot without organ or systems involvement	Billable	HCC 93
M05.79	Rheumatoid arthritis with rheumatoid factor of multiple sites without organ or systems involvement	Billable	HCC 93
M05.7A	Rheumatoid arthritis with rheumatoid factor of other specified site without organ or systems involvement	Billable	HCC 93
M05.8	Other rheumatoid arthritis with rheumatoid factor	Header	Header code, not reportable
M05.80	Other rheumatoid arthritis with rheumatoid factor of unspecified site	Billable	HCC 93
M05.81	Other rheumatoid arthritis with rheumatoid factor of shoulder	Header	Header code, not reportable
M05.811	Other rheumatoid arthritis with rheumatoid factor of right shoulder	Billable	HCC 93
M05.812	Other rheumatoid arthritis with rheumatoid factor of left shoulder	Billable	HCC 93
M05.819	Other rheumatoid arthritis with rheumatoid factor of unspecified shoulder	Billable	HCC 93
M05.82	Other rheumatoid arthritis with rheumatoid factor of elbow	Header	Header code, not reportable
M05.821	Other rheumatoid arthritis with rheumatoid factor of right elbow	Billable	HCC 93
M05.822	Other rheumatoid arthritis with rheumatoid factor of left elbow	Billable	HCC 93
M05.829	Other rheumatoid arthritis with rheumatoid factor of unspecified elbow	Billable	HCC 93
M05.83	Other rheumatoid arthritis with rheumatoid factor of wrist	Header	Header code, not reportable
M05.831	Other rheumatoid arthritis with rheumatoid factor of right wrist	Billable	HCC 93
M05.832	Other rheumatoid arthritis with rheumatoid factor of left wrist	Billable	HCC 93
M05.839	Other rheumatoid arthritis with rheumatoid factor of unspecified wrist	Billable	HCC 93
M05.84	Other rheumatoid arthritis with rheumatoid factor of hand	Header	Header code, not reportable
M05.841	Other rheumatoid arthritis with rheumatoid factor of right hand	Billable	HCC 93
M05.842	Other rheumatoid arthritis with rheumatoid factor of left hand	Billable	HCC 93
M05.849	Other rheumatoid arthritis with rheumatoid factor of unspecified hand	Billable	HCC 93
M05.85	Other rheumatoid arthritis with rheumatoid factor of hip	Header	Header code, not reportable
M05.851	Other rheumatoid arthritis with rheumatoid factor of right hip	Billable	HCC 93
M05.852	Other rheumatoid arthritis with rheumatoid factor of left hip	Billable	HCC 93
M05.859	Other rheumatoid arthritis with rheumatoid factor of unspecified hip	Billable	HCC 93
M05.86	Other rheumatoid arthritis with rheumatoid factor of knee	Header	Header code, not reportable
M05.861	Other rheumatoid arthritis with rheumatoid factor of right knee	Billable	HCC 93
M05.862	Other rheumatoid arthritis with rheumatoid factor of left knee	Billable	HCC 93
M05.869	Other rheumatoid arthritis with rheumatoid factor of unspecified knee	Billable	HCC 93
M05.87	Other rheumatoid arthritis with rheumatoid factor of ankle and foot	Header	Header code, not reportable
M05.871	Other rheumatoid arthritis with rheumatoid factor of right ankle and foot	Billable	HCC 93
M05.872	Other rheumatoid arthritis with rheumatoid factor of left ankle and foot	Billable	HCC 93
M05.879	Other rheumatoid arthritis with rheumatoid factor of unspecified ankle and foot	Billable	HCC 93
M05.89	Other rheumatoid arthritis with rheumatoid factor of multiple sites	Billable	HCC 93
M05.8A	Other rheumatoid arthritis with rheumatoid factor of other specified site	Billable	HCC 93
M05.9	Rheumatoid arthritis with rheumatoid factor, unspecified	Billable	HCC 93
M05.A	Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis	Billable	HCC 93

Documentation guides for M05

Rheumatoid ArthritisMusculoskeletal

Frequently asked questions

How many M05 codes are there?

The M05 category (Rheumatoid arthritis with rheumatoid factor) has 284 codes in the FY2026 ICD-10-CM order file: 211 billable and 73 header codes, counting the category itself. Only a billable code can be reported on a claim.

Which M05 codes map to an HCC under CMS-HCC V28?

211 billable codes in M05 map to HCC 93 in the CMS-HCC V28 model for payment year 2026. HCC 93 (Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders) carries the most, with 211 codes.

Which M05 codes are not billable?

M05 itself and 72 subcategory codes are header codes that need a further character before they can be reported: M05.0 (Felty's syndrome), M05.01 (Felty's syndrome, shoulder), M05.02 (Felty's syndrome, elbow), M05.03 (Felty's syndrome, wrist), M05.04 (Felty's syndrome, hand), M05.05 (Felty's syndrome, hip), M05.06 (Felty's syndrome, knee), M05.07 (Felty's syndrome, ankle and foot), and 64 more. Each one is listed in the table with the billable codes beneath it.

Source: FY2026 ICD-10-CM order file (FY 2026 Apr update) for codes, billability, and descriptors; CMS-HCC V28 PY2026 final ICD-10-CM mappings and relative factors for payment status. Table generated 2026-09-10.