G91.8
BillableOther hydrocephalus
HCC Category Mapping
V28HCC 127 — Dementia, Mild or Unspecified
0.464What This Code Means
A condition where excess fluid builds up in the brain due to various causes other than the more common types of hydrocephalus. This fluid accumulation can increase pressure inside the skull and affect brain function.
Coding Tips
- •Use this code when hydrocephalus is present but doesn't fit into the communicating or obstructive categories
- •Ensure documentation specifies the underlying cause or type of hydrocephalus to support medical necessity
Clinical Significance
Other hydrocephalus captures specified forms of hydrocephalus that do not fit into the communicating, obstructive, normal pressure, or post-traumatic categories. This includes conditions such as arrested hydrocephalus or other atypical presentations. Accurate use of this code prevents inappropriate use of the unspecified code when the type is documented but does not match other specific categories.
Documentation Requirements
- ✓Specification of the type of hydrocephalus that differentiates it from communicating, obstructive, normal pressure, or post-traumatic
- ✓Imaging evidence of ventricular enlargement or other hydrocephalus findings
- ✓Clinical symptoms and their relationship to the hydrocephalus
- ✓Treatment plan and any surgical interventions in place
- ✓Rationale for why more specific hydrocephalus codes do not apply
Commonly Confused Codes
G91.9 — Hydrocephalus, unspecified: use only when no further detail is available; G91.8 is for specified-but-other typesG91.0 — Communicating hydrocephalus: use when CSF absorption is impaired with open flow pathwaysG91.2 — Normal pressure hydrocephalus: use when the classic triad and normal CSF pressure are documentedG91.1 — Obstructive hydrocephalus: use when a specific point of obstruction is identified