G35.A ICD-10-CM Code: Relapsing-remitting multiple sclerosis

G35.A is the ICD-10-CM diagnosis code for relapsing-remitting multiple sclerosis. Relapsing-remitting multiple sclerosis is the most common form of MS, characterized by periods of new or worsening symptoms (relapses) followed by periods of partial or complete recovery (remissions). G35.A sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering demyelinating diseases of the central nervous system (g35-g37).

Under the CMS-HCC V28 risk adjustment model, G35.A maps to Multiple Sclerosis (HCC 198) with a source-labeled community, non-dual, aged reference coefficient of 0.647. No V24 mapping is shown for G35.A; 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 is the most common MS subtype; ensure documentation specifies relapsing-remitting rather than other MS types. For G35.A, 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.