Obstructive hydrocephalus

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2016 onwards.

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 Obstructive 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.

Icterus
Cholemia
Impervious
Imperforate
Yellow > jaundice
Macrohydrocephalus
Water > on > brain
Stroke > cryptogenic
Dropsy, dropsical > brain
Disease, diseased > artery
Infarct, infarction > brain
Absence > congenital > lumen
Infarct, infarction > cerebellar
Valve, valvular > congenital NEC
Blind > tract or tube, congenital NEC
Stricture > organ or site, congenital NEC
Constriction > organ or site, congenital NEC
Obliteration > organ or site, congenital NEC
Block, blocked > organ or site, congenital NEC
Stenosis, stenotic > organ or site, congenital NEC
Occlusion, occluded > organ or site, congenital NEC
Strangulation, strangulated > organ or site, congenital NEC
Contraction, contracture, contracted > organ or site, congenital NEC
Obstruction, obstructed, obstructive > organ or site, congenital NEC
Hydrocephalus > obstructive
Hydrocephalus > noncommunicating
Block, blocked > foramen Magendie
Occlusion, occluded > ventricle NEC
Hydrocephalus > foramen Magendie block
Occlusion, occluded > aqueduct of Sylvius
Stricture > aqueduct of Sylvius > acquired
Stenosis, stenotic > aqueduct of Sylvius > acquired
Obstruction, obstructed, obstructive > aqueduct of Sylvius

Codes in the same group

Code	Description	Status
G91.0	Communicating 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