331.5
Idiopathic normal pressure hydrocephalus (INPH)
The ICD-9 code for idiopathic normal pressure hydrocephalus (inph) is 331.5.
Legacy code — retired October 1, 2015ICD-10-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents.
View ICD-9 → ICD-10 crosswalk for 331.5 →