G91: Hydrocephalus
Codes under G91 (Hydrocephalus). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| G91.0 | Communicating hydrocephalus | ✓ |
| G91.0 | Communicating hydrocephalus | ✓ |
| G91.1 | Obstructive hydrocephalus | ✓ |
| G91.1 | Obstructive hydrocephalus | ✓ |
| G91.2 | (Idiopathic) normal pressure hydrocephalus | ✓ |
| G91.2 | (Idiopathic) normal pressure hydrocephalus | ✓ |
| G91.3 | Post-traumatic hydrocephalus, unspecified | ✓ |
| G91.3 | Post-traumatic hydrocephalus, unspecified | ✓ |
| G91.4 | Hydrocephalus in diseases classified elsewhere | ✓ |
| G91.4 | Hydrocephalus in diseases classified elsewhere | ✓ |
| G91.8 | Other hydrocephalus | ✓ |
| G91.8 | Other hydrocephalus | ✓ |
| G91.9 | Hydrocephalus, unspecified | ✓ |
| G91.9 | Hydrocephalus, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code G91?
G91 is an ICD-10-CM category covering Hydrocephalus. It contains 14 more specific diagnosis codes, 14 of which are billable.
Is G91 a billable code?
No — G91 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example G91.0 — Communicating hydrocephalus). 14 of the 14 codes under G91 are billable.
What codes fall under G91?
G91 includes G91.0, G91.0, G91.1, G91.1, G91.2, plus 9 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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