ICD-10-CM 2027
ICD-10 code for brain fistula
From the official ICD-10-CM alphabetic index entry “Fistula (cutaneous) › brain”. Page updated September 29, 2026.
About coding brain fistula
The ICD-10-CM code for brain fistula is G93.89 (Other specified disorders of brain). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on G93.89.
Within G93.8, choose G93.89 (Other specified disorders of brain) only when documentation doesn't support a more specific option: temporal sclerosis (G93.81) and brain death (G93.82).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 070 (Other Cerebrovascular Disorders with MCC, relative weight 1.6093), DRG 071 (Other Cerebrovascular Disorders with CC, relative weight 1.0177) and DRG 072 (Other Cerebrovascular Disorders without CC/MCC, relative weight 0.7348), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific brain fistula codes (official index)
Common questions about brain fistula ICD-10 codes
What is the ICD-10 code for brain fistula?
- G93.89 — Other specified disorders of brain. More specific codes apply when the documentation supports them: I67.1, Q28.2.
What is the ICD-10 code for arteriovenous brain fistula?
- I67.1 — Cerebral aneurysm, nonruptured.
Is G93.89 billable?
- Yes. G93.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G93.89 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G93.89 as a principal diagnosis.
Is G93.89 a CC or MCC?
- No. G93.89 is neither a CC nor an MCC under MS-DRG v44.0.