G35.CHeader code — not billable
Secondary progressive multiple sclerosis
- Chapter
- 6. Diseases of the nervous system
- Category
- G35
- Effective date
- October 1, 2026
Related codes in category G35
G35Multiple sclerosisG35.ARelapsing-remitting multiple sclerosisYesG35.BPrimary progressive multiple sclerosisG35.B0Primary progressive multiple sclerosis, unspecifiedYesG35.B1Active primary progressive multiple sclerosisYesG35.B2Non-active primary progressive multiple sclerosisYesG35.C0Secondary progressive multiple sclerosis, unspecifiedYesG35.C1Active secondary progressive multiple sclerosisYesG35.C2Non-active secondary progressive multiple sclerosisYesG35.DMultiple sclerosis, unspecifiedYes
Frequently asked questions
What is ICD-10 code G35.C?
G35.C is an ICD-10-CM diagnosis code for Secondary progressive multiple sclerosis.
Is G35.C a billable code?
No. G35.C is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is G35.C in?
G35.C falls under Chapter 6: Diseases of the nervous system.
When did G35.C become effective?
G35.C has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to G35.C?
G35.C belongs to category G35, which includes 10 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.