M05.619 ICD-10-CM Code: Rheumatoid arthritis of unspecified shoulder with involvement of other organs and systems
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Inflammatory polyarthropathies (M05-M14)
M05.619
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceRheumatoid arthritis of unspecified shoulder with involvement of other organs and systems
Rheumatoid arthritis affecting an unspecified shoulder with systemic complications involving other organs such as the heart, lungs, or blood vessels.
Buddy Insight
Indicates rheumatoid arthritis of unspecified shoulder with involvement of other organs and systems, representing severe systemic inflammatory disease with extra-articular manifestations.
CMS-HCC V28
MappedHCC 93
RAF 0.617
CMS-HCC V24
MappedHCC 40
RAF 0.421
ACA/HHS
MappedHCC 56
Varies by metal level
ESRD/PACE
MappedHCC 40
RAF 0.058
RXHCC
MappedHCC 83
RAF 0.222
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for M05.619 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for M05.619 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for M05.619 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for M05.619 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for M05.619 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for M05.619 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for M05.619 in this effective period.
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 M05.619 an HCC code?
Yes. M05.619 (Rheumatoid arthritis of unspecified shoulder with involvement of other organs and systems) maps to Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders under the CMS-HCC V28 risk adjustment model (and Rheumatoid Arthritis and Inflammatory Connective Tissue Disease under V24), with a community non-dual aged RAF of 0.617. It is billable for payment year 2026.
Coder answer: M05.619 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
- M05.619
- Description
- Rheumatoid arthritis of unspecified shoulder with involvement of other organs and systems
- HCC (V28)
- HCC 93 — Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders
- RAF
- 0.617
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
Each model's RAF is its CMS base weight for that model's standard population, so 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 segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
Work M05.619 in the Code Book — tabular path, V28 RAF, and MEAT checklist →
MEAT Criteria for M05.619
For M05.619 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.
- 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
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed M05.619 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
Get the V28 RAF + MEAT cheat sheet
One printable page: confirm a code's V28 HCC status, its RAF weight, and the MEAT your note needs to make it stick. Free, no card.
Free PDF. No card. Unsubscribe anytime.
What This Code Means
M05.619 is the ICD-10-CM diagnosis code for rheumatoid arthritis of unspecified shoulder with involvement of other organs and systems. Rheumatoid arthritis affecting an unspecified shoulder with systemic complications involving other organs such as the heart, lungs, or blood vessels. M05.619 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, M05.619 maps to Rheumatoid Arthritis and Other Specified Inflammatory Rheumatic Disorders (HCC 93) with a community, non-dual, aged base RAF weight of 0.617. Under the older CMS-HCC V24 model, M05.619 maps to Rheumatoid Arthritis and Inflammatory Connective Tissue Disease (HCC 40) with a community, non-dual, aged base RAF weight of 0.421. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
Use this code only when the specific shoulder (right or left) is not documented; query provider for laterality when possible. Because M05.619 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. 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, RAF weights, and MEAT documentation criteria for M05.619 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the specific shoulder (right or left) is not documented; query provider for laterality when possible
- •Confirm presence of systemic organ involvement beyond the joint to justify this code assignment
Clinical Significance
Indicates rheumatoid arthritis of unspecified shoulder with involvement of other organs and systems, representing severe systemic inflammatory disease with extra-articular manifestations. This diagnosis reflects complex RA with multi-organ involvement requiring intensive medical management and monitoring.
Documentation Requirements
- ✓Confirmed rheumatoid arthritis diagnosis meeting clinical criteria
- ✓Shoulder joint involvement without laterality specification
- ✓Documentation of extra-articular organ system involvement
- ✓Evidence of systemic manifestations beyond joint disease
- ✓Laboratory evidence of systemic inflammation and disease activity
- ✓Specialist evaluations documenting multi-organ involvement
- ✓Assessment of functional status and disability level
- ✓Physician documentation linking RA to systemic complications
Commonly Confused Codes
- •M05.611: Use when right shoulder is specifically documented
- •M05.612: Use when left shoulder is specifically documented
- •M19.019: Shoulder osteoarthritis without rheumatoid component
- •M06.819: Other RA of unspecified shoulder without organ involvement
- •M75.30: Calcific tendinitis of unspecified shoulder without RA