FY2027 ICD-10-CM reference
G35: Multiple sclerosis
Deleted 9/30/2025
G35 (Multiple sclerosis) was deleted as a billable code in the FY2026 ICD-10-CM update. Use it only for dates of service through 9/30/2025.
Prior-year mapping (payment year 2026): CMS-HCC V28 HCC 198 · RxHCC V08 HCC 159 · ESRD V24 HCC 77.Source: CMS 2026 Final ICD-10-CM Mappings, row 3438.
Codes CMS added under G35 in the FY2026 addenda:
- G35.A: Relapsing-remitting 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.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
Source: CMS FY2026 ICD-10-CM code descriptions addenda (icd10cm_codes_addenda_2026.txt, line 38).
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Multiple sclerosis. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
More specific FY2027 codes
- G35.A: Relapsing-remitting multiple sclerosisBillable code
- G35.B: Primary progressive multiple sclerosisNonbillable heading
- G35.C: Secondary progressive multiple sclerosisNonbillable heading
- G35.D: Multiple sclerosis, unspecifiedBillable code
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: G00-G99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: G00-G99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: G00-G99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: G00-G99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: G00-G99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: G00-G99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: G00-G99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: G00-G99 (chapter, inherited).
Compare the FY2027 additions, removals and billable-status changes
What does G35 mean in FY2027?
The official ICD-10-CM descriptor is Multiple sclerosis. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is G35 billable in FY2027?
The FY2027 order file marks G35 as a nonbillable heading. Select a complete billable child code.
Does G35 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.
Review the FY2026 April edition