ICD-10 M08.279
Billable / Specific HCC v28: 40Juvenile rheumatoid arthritis with systemic onset, unspecified ankle and foot
About ICD-10-CM M08.279
ICD-10-CM code M08.279 represents Juvenile rheumatoid arthritis with systemic onset, unspecified ankle and foot. This is a billable/specific code in the Musculoskeletal and Connective Tissue chapter (block M08). The 2026 edition of ICD-10-CM M08.279 became effective on October 1, 2025.
Coding Tips for M08.279
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
M08.279 is a CMS-HCC v28 risk-adjustment code (category 40). To count for the patient Risk Adjustment Factor (RAF), document the diagnosis with MEAT language each calendar year: Monitored, Evaluated, Assessed, Treated. A diagnosis on the problem list alone does not satisfy CMS RADV audit standards. Include the diagnosis in the assessment with current status and current treatment plan.
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Medicare LCD Coverage for M08.279
Local Coverage Determinations (LCDs) from CMS MACs that list M08.279 as a covered diagnosis.
Showing top 6. Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing M08.279.
1 Cigna
2 Medicare
CPT Codes Commonly Billed with M08.279
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert M08.279 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| M08.279 | 71430 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To M08.279
Other codes in section M05-M14 (Inflammatory polyarthropathies).
ICD-10 M08.279, Billing FAQ
Is ICD-10 code M08.279 billable? +
Yes, M08.279 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Does M08.279 affect Medicare Advantage HCC risk adjustment? +
Yes. M08.279 maps to CMS-HCC v28 category 40. Capture this diagnosis annually for accurate Medicare Advantage risk score.
What ICD-9 codes does M08.279 map to? +
Per CMS GEMs, M08.279 maps to ICD-9 codes: 71430. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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