Sequelae of inflammatory diseases of central nervous system
In Inflammatory diseases of the central nervous system (G00-G09), chapter 6: Diseases of the Nervous System
- G09 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under G00-G09 below.
- As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
- AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
- 127 US deaths in 2024 had an underlying cause in category G09, per the National Vital Statistics System on CDC WONDER. Death records use WHO ICD-10, so the count is for the whole category.
Also indexed as: Abscess, cerebellum, cerebellar, sequelae; Abscess, cerebral, sequelae; Abscess, extradural, brain, sequelae; Abscess, subdural, brain, sequelae; Parencephalitis, sequelae; Sequelae, abscess, intracranial or intraspinal; Sequelae, encephalitis or encephalomyelitis; Sequelae, infection, pyogenic, intracranial or intraspinal; Sequelae, meningitis, bacterial; Sequelae, meningitis, other or unspecified cause; Sequelae, phlebitis or thrombophlebitis of intracranial or intraspinal venous sinuses and veins; Suppuration, brain, sequelae; Thrombophlebitis, cerebral, sequelae; Thrombophlebitis, intracranial venous sinus, sequelae
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Instructional notes
Code first: code the underlying condition first, then this code
- condition resulting from (sequela) of inflammatory diseases of central nervous system
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers default dominant or nondominant side for hemiplegia and monoplegia, and use and sequencing of G89 pain codes, including postoperative, chronic, and neoplasm-related pain.
- Dominant/nondominant side (page 45)
- Pain - Category G89 (page 45)
Other codes under G00-G09
Inflammatory diseases of the central nervous system (G00-G09)
- G00Bacterial meningitis, not elsewhere classified
- G01Meningitis in bacterial diseases classified elsewhere
- G02Meningitis in other infectious and parasitic diseases classified elsewhere
- G03Meningitis due to other and unspecified causes
- G04Encephalitis, myelitis and encephalomyelitis
- G05Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
- G06Intracranial and intraspinal abscess and granuloma
- G07Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere
- G08Intracranial and intraspinal phlebitis and thrombophlebitis
- G09Sequelae of inflammatory diseases of central nervous system(this code)
G09 MS-DRGs
As the principal diagnosis, G09 groups to MS-DRG 091, 092, or 093 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
G09 is in Sequela of specified nervous system conditions (NVS022, its default category), with 6 codes. Others in it:
Medicare coverage articles listing G09
This Medicare billing and coding article lists G09 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Brain Diseases
Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body. Your nerves take in information from your senses and send it to the brain to be processed. Your brain and nerves also communicate to help you move and to control your body's functions.
Read more about brain diseases on MedlinePlusSpinal Cord Diseases
Your spinal cord is a bundle of nerves that runs down the middle of your back. It carries signals back and forth between your body and your brain. It is protected by your vertebrae, which are the bone disks that make up your spine. If you have an accident that damages the vertebrae or other parts of the spine, this can also injure the spinal cord. Other spinal cord problems include:
Read more about spinal cord diseases on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 326 Late effects of intracranial abscess or pyogenic infection (approximate)