G37.9 Demyelinating disease of central nervous system, unspecified

The ICD-10-CM code for Demyelinating disease of central nervous system, unspecified is G37.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

6: Diseases of the nervous system (G00-G99)

Section

G35-G37: Demyelinating diseases of the central nervous system (G35-G37)

Category G37

11 codes (9 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to G37.9:

• Syndrome › clinically isolated
• Disease, diseased › demyelinating, demyelinizating (nervous system)
• Syndrome › demyelinating
• Degeneration, degenerative › myelin, central nervous system
• Sclerosis, sclerotic › brain (generalized) (lobular)
• Demyelination, demyelinization › central nervous system

Inclusion Terms

• Clinically isolated syndromes

U.S. Hospital Utilization

• An estimated 6,070 U.S. inpatient stays in 2023 included G37.9 among the documented diagnoses.
• 1,870 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Dominant/nondominant side (TOC entry)

a. Dominant/nondominant side ................................................................................................. 45

Pain - Category G89 (TOC entry)

b. Pain - Category G89.............................................................................................................. 45

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)