What does ICD-10 code G09 mean?

G09 is the ICD-10-CM diagnosis code for Sequelae of inflammatory diseases of central nervous system. Sequelae of inflammatory diseases of central nervous system

Is G09 a billable ICD-10 code?

Yes, G09 is a billable ICD-10-CM code that can be used on medical claims.

What chapter is G09 in?

G09 is classified under Chapter 6: Diseases of the nervous system (G00-G99), Section G00-G09: Inflammatory diseases of the central nervous system (G00-G09).

G09 Sequelae of inflammatory diseases of central nervous system

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The ICD-10-CM code for Sequelae of inflammatory diseases of central nervous system is G09 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter: 6: Diseases of the nervous system (G00-G99)
Section: G00-G09: Inflammatory diseases of the central nervous system (G00-G09)
Category G09: 1 code (1 billable)
FY2026 Status: Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to G09:

Sequelae (of) › abscess, intracranial or intraspinal (conditions in G06)
Sequelae (of) › encephalitis or encephalomyelitis (conditions in G04)
Sequelae (of) › infection, pyogenic, intracranial or intraspinal
Sequelae (of) › phlebitis or thrombophlebitis of intracranial or intraspinal venous sinuses and veins (conditions in G08)
Parencephalitis › sequelae
Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › cerebral (embolic) › sequelae
Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › cerebellum, cerebellar › sequelae
Sequelae (of) › meningitis › bacterial (conditions in G00)

Code First

condition resulting from (sequela) of inflammatory diseases of central nervous system

Notes

Category G09 is to be used to indicate conditions whose primary classification is to G00-G08 as the cause of sequelae, themselves classifiable elsewhere. The 'sequelae' include conditions specified as residuals.

U.S. Hospital Utilization

An estimated 1,100 U.S. inpatient stays in 2023 included G09 among the documented diagnoses.

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

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.6.a

Pain - Category G89 (TOC entry)

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

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.6.b

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