ICD-10-CM › G00-G99 › G89-G99 › G91 Hydrocephalus › G91.0
Communicating hydrocephalus
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Communicating hydrocephalus
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from G91 Hydrocephalus
Excludes1 - never coded here
- Arnold-Chiari syndrome with hydrocephalus (Q07.-)
- congenital hydrocephalus (Q03.-)
- spina bifida with hydrocephalus (Q05.-)
Includes
- acquired hydrocephalus
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Macrohydrocephalus
- Water > on > brain
- Dropsy, dropsical > brain
- Hydrocephalus > communicating
- Hydrocephalus > normal pressure > secondary
Codes in the same group
| Code | Description | Status |
|---|---|---|
| G91.1 | Obstructive hydrocephalus | Valid |
| G91.2 | (Idiopathic) normal pressure hydrocephalus | Valid |
| G91.3 | Post-traumatic hydrocephalus, unspecified | Valid |
| G91.4 | Hydrocephalus in diseases classified elsewhere | Valid |
| G91.8 | Other hydrocephalus | Valid |
| G91.9 | Hydrocephalus, unspecified | Valid |