M06.871 ICD-10-CM Code: Other specified rheumatoid arthritis, right ankle and foot
M06.871 maps to CMS-HCC V28 93. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Inflammatory polyarthropathies (M05-M14)
M06.871
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther specified rheumatoid arthritis, right ankle and foot
A form of rheumatoid arthritis affecting the right ankle and foot, characterized by inflammation and joint damage that doesn't fit into other specific rheumatoid arthritis categories.
Buddy Insight
Other specified rheumatoid arthritis of the right ankle and foot indicates an atypical RA variant affecting weight-bearing joints crucial for ambulation and balance.
CMS-HCC V28
MappedHCC 93
Code-level coefficient reference
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 056
Code-level coefficient reference
ESRD/PACE
MappedHCC 40
Code-level coefficient reference
RXHCC
MappedHCC 83
Code-level coefficient reference
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for M06.871. Check the code and parent instructions in the Code Book.
Excludes 2
Official- arthropathic psoriasis (L40.5-)Inherited from M00-M99
- certain conditions originating in the perinatal period (P04-P96)Inherited from M00-M99
- certain infectious and parasitic diseases (A00-B99)Inherited from M00-M99
- compartment syndrome (traumatic) (T79.A-)Inherited from M00-M99
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from M00-M99
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from M00-M99
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from M00-M99
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from M00-M99
- neoplasms (C00-D49)Inherited from M00-M99
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from M00-M99
Related Codes
Includes
OfficialNo Includes notes are included in this display for M06.871. Check the code and parent instructions in the Code Book.
Excludes 1
OfficialNo Excludes 1 notes are included in this display for M06.871. Check the code and parent instructions in the Code Book.
Code First
OfficialNo Code First sequencing instructions are included in this display for M06.871. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for M06.871. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for M06.871. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is M06.871 an HCC code?
Yes. M06.871 (Other specified rheumatoid arthritis, right ankle and foot) maps to HCC 93, Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.617. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.
Coder answer: M06.871 is billable and maps to V28 HCC 93, Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- M06.871
- Description
- Other specified rheumatoid arthritis, right ankle and foot
- HCC (V28)
- HCC 93 — Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders
- RAF reference coefficient
- 0.617
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work M06.871 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for M06.871
For M06.871, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Coder workflow notes
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What This Code Means
M06.871 is the ICD-10-CM diagnosis code for other specified rheumatoid arthritis, right ankle and foot. A form of rheumatoid arthritis affecting the right ankle and foot, characterized by inflammation and joint damage that doesn't fit into other specific rheumatoid arthritis categories. M06.871 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering inflammatory polyarthropathies (m05-m14).
Under the CMS-HCC V28 risk adjustment model, M06.871 maps to Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders (HCC 93) with a source-labeled community, non-dual, aged reference coefficient of 0.617. No V24 mapping is shown for M06.871; use the applicable model and payment year when reviewing the V28 mapping. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.
This code encompasses both ankle and foot involvement on the right side; document which specific joints are affected. For M06.871, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for M06.871 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code encompasses both ankle and foot involvement on the right side; document which specific joints are affected
- •Foot and ankle involvement in RA can significantly impact mobility; ensure functional impact is documented for treatment planning
Clinical Significance
Other specified rheumatoid arthritis of the right ankle and foot indicates an atypical RA variant affecting weight-bearing joints crucial for ambulation and balance. Involvement of these joints significantly impacts mobility, gait stability, and activities requiring standing or walking.
Documentation Requirements
- ✓Confirmed rheumatoid arthritis diagnosis with specific atypical characteristics
- ✓Physical examination documenting right ankle and/or foot joint involvement
- ✓Description of features that distinguish this as 'other specified' RA type
- ✓Assessment of ankle and foot range of motion and weight-bearing capacity
- ✓Laboratory evidence supporting active rheumatoid disease process
- ✓Functional evaluation of gait, balance, and ambulation limitations
- ✓Documentation of specific joints affected (ankle, subtalar, midfoot, forefoot)
- ✓Treatment plan including orthotic considerations when appropriate
Commonly Confused Codes
- •M06.872: Other specified rheumatoid arthritis, left ankle and foot (incorrect laterality)
- •M06.879: Other specified rheumatoid arthritis, unspecified ankle and foot (when laterality documented)
- •M05.871: Other rheumatoid arthritis with rheumatoid factor of right ankle and foot (different RA classification)
- •M25.571: Pain in right ankle (symptom code without inflammatory diagnosis)
- •M79.3: Panniculitis, unspecified (non-articular inflammation)