2026 ICD-10-CM Diagnosis Code G35.B0Primary progressive multiple sclerosis, unspecified

ICD-10-CM Codes›G00–G99›G35-G37›G35

ICD-10-CM G35.B0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G35.B0 is a billable ICD-10-CM diagnosis code for primary progressive multiple sclerosis, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as primary progressive multiple sclerosis.

Code Identity

ICD-10-CM Code
G35.B0
Billable Status
Yes — Valid for Submission
Code Describes
Primary progressive multiple sclerosis, unspecified
Short Description
Primary progressive multiple sclerosis, unspecified
Same as the full description in the CMS dataset.
Parent Code
G35.B
Primary progressive multiple sclerosis

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG35-G37Demyelinating diseases of the central nervous system
CategoryG35Multiple sclerosis
This CodeG35.B0Primary progressive multiple sclerosis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Primary progressive multiple sclerosis
  • Progressive multiple sclerosis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Sclerosis, sclerotic
      • multiple (brain stem) (cerebral) (disseminated) (generalized) (spinal cord)
        • progressive
          • primary

Code History & ChangesHistory

New Code G35.B0 was added to the ICD-10-CM code set for FY 2026, effective October 1, 2025.

Replacement G35.B0 replaces the following previously assigned code(s):

  • G35 - Multiple sclerosis
FY 2026AddedAdded to the ICD-10-CM code setEffective October 1, 2025.
FY 2026CurrentRevised in the current code setEffective October 1, 2025 through September 30, 2026.

Questions About G35.B0Overview

Is G35.B0 (Primary progressive multiple sclerosis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report primary progressive multiple sclerosis, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.