ICD10Check
CheckerBrowseOpen

G91.4

✓ Billable

Hydrocephalus in diseases classified elsewhere

Diseases of the nervous system (G00-G99)

Check This Code

📋 Code Instructions

  • • Code first: underlying condition, such as:
  • • Code first: congenital syphilis (A50.4-)
  • • Code first: neoplasm (C00-D49)
  • • Code first: plasminogen deficiency (E88.02)

❌ Excludes1

direct

Cannot be coded with G91.4

  • • hydrocephalus due to congenital toxoplasmosis (P37.1)

❌ Excludes1

inherited from G91

Rules from parent category G91: Hydrocephalus

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

🧪 Validate Combinations

Add G91.4 to the Excludes Checker to validate against your full code list.

Open in Checker →

Code Information

CodeG91.4
BillableYes
ParentG91
CategoryDiseases of the nervous system (G00-G99)
Excludes14 rule(s)
Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)