Meningitis in bacterial diseases classified elsewhere
In Inflammatory diseases of the central nervous system (G00-G09), chapter 6: Diseases of the Nervous System
- G01 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 an MCC (major complication), which can raise the MS-DRG payment. It doesn't count when the principal diagnosis is one of 106 closely related codes.
- 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).
- Can't be the principal diagnosis: code the underlying condition first. (Manifestation list)
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Instructional notes
Excludes1: not coded here, use a different code
Code first: code the underlying condition first, then this code
- underlying disease
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(this code)
- 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
G01 MS-DRGs
As the principal diagnosis, G01 groups to these 7 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 023 Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
- DRG 024 Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC
- DRG 094 Bacterial and Tuberculous Infections of Nervous System with MCC
- DRG 095 Bacterial and Tuberculous Infections of Nervous System with CC
- DRG 096 Bacterial and Tuberculous Infections of Nervous System without CC/MCC
- DRG 791 Prematurity with Major Problems
- DRG 793 Full Term Neonate with Major Problems
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
G01 is in Bacterial infections (INF003), with 398 codes. Others in it:
Medicare coverage articles listing G01
These 2 Medicare billing and coding articles list G01 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.
- Visual Fields Testing (2 contractors)
- MRI and CT Scans of the Head and Neck
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Meningitis
Meningitis is inflammation of the thin tissue that surrounds the brain and spinal cord, called the meninges. There are several types of meningitis. The most common is viral meningitis. You get it when a virus enters the body through the nose or mouth and travels to the brain. Bacterial meningitis is rare but can be deadly. It usually starts with bacteria that cause a cold-like infection. It can cause stroke, hearing loss, and brain damage. It can also harm other organs. Pneumococcal infections and meningococcal infections are the most common causes of bacterial meningitis.
Read more about meningitis 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).
- 320.7 Meningitis in other bacterial diseases classified elsewhere