G35.C1 – Active secondary progressive multiple sclerosis
ICD-10-CM 2027 diagnosis code · Demyelinating diseases of the central nervous system
ICD-10-CM code
G35.C1
- Code
G35.C1(claims format:G35C1)- Description
- Active secondary progressive multiple sclerosis
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G35-G37 Demyelinating diseases of the central nervous system
- Parent codes
- G35 › G35.C
Notes for G35.C1
Applicable to:
- Secondary progressive multiple sclerosis with evidence of inflammatory disease activity
Index terms for G35.C1
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in G35.C
Frequently asked questions
What is ICD-10 code G35.C1?
G35.C1 is the ICD-10-CM code for active secondary progressive multiple sclerosis, in the block G35-G37 (Demyelinating diseases of the central nervous system).
Is G35.C1 a billable code?
Yes. G35.C1 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does G35.C1 belong to?
It belongs to category G35 – Multiple sclerosis.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.