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G91.1

✓ Billable

Obstructive hydrocephalus

Diseases of the nervous system (G00-G99)

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❌ Excludes1

inherited from G91

Rules from parent category G91: Hydrocephalus

  • • Arnold-Chiari syndrome with hydrocephalus (Q07.-)
  • • congenital hydrocephalus (Q03.-)
  • • spina bifida with hydrocephalus (Q05.-)

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Code Information

CodeG91.1
BillableYes
ParentG91
CategoryDiseases of the nervous system (G00-G99)
Excludes13 rule(s)
Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)