AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2025 Issue 4; New/Revised ICD-10-CM Codes
Relapsing-Remitting Multiple Sclerosis
Code G35, Multiple sclerosis, has been expanded and new codes and subcategories have been created for multiple sclerosis phenotypes as follows:G35.A Relapsing-remitting multiple sclerosis G35.B Primary progressive multiple sclerosis G35.B0 Primary progressive multiple sclerosis, unspecified G35.B1 Active primary progressive multiple sclerosis G35.B2 Non-active primary progressive multiple sclerosis G35.C Secondary progressive multiple sclerosis G35.C0 Secondary progressive multiple sclerosis, unspecified G35.C1 Active secondary progressive multiple sclerosis G35.C2 Non-active secondary progressive multiple sclerosis G35.D Multiple sclerosis, unspecified Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system leading to...
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Article Overview
This article covers a coding update for multiple sclerosis along with a plain-language overview of the major disease phenotypes. It is relevant to coders, clinical documentation staff, and healthcare teams who need to understand how multiple sclerosis subtypes are organized in the code set and how the condition is described clinically at a high level.
Why This Topic Matters
Multiple sclerosis documentation can depend on the phenotype being described, and this update adds more specific categories within the broader diagnosis. Understanding the structure of the revised code family helps support accurate record review and code lookup.
What You Will Learn
- How the multiple sclerosis code family has been expanded
- What the major multiple sclerosis phenotypes are
- How the article frames the condition in broad clinical terms
- Why phenotype-specific documentation matters for understanding progression
Who Should Read This
- Medical coders
- Coding auditors
- Clinical documentation specialists
- Neurology practices
- Health information management professionals
Codes Discussed
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