G91
Header — not billableHydrocephalus
The ICD-10 code for hydrocephalus is G91.
G91 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 7 more specific codes below.
Clinical notes
Excludes1 (not coded here)
An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).
Includes
Terms listed here further define or give examples of the conditions grouped under this code — they describe what the code covers, not a separate diagnosis.
- acquired hydrocephalus
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- G89Pain, not elsewhere classifiednon-billable header
- G90Disorders of autonomic nervous systemnon-billable header
- G92Toxic encephalopathynon-billable header
- G93Other disorders of brainnon-billable header
- G94Other disorders of brain in diseases classified elsewhere
- G95Other and unspecified diseases of spinal cordnon-billable header
- G96Other disorders of central nervous systemnon-billable header
- G97Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classifiednon-billable header
- G98Other disorders of nervous system not elsewhere classifiednon-billable header
- G99Other disorders of nervous system in diseases classified elsewherenon-billable header
- G91Hydrocephalusnon-billable header