AHA Coding Clinic® for ICD-9 - 2007 Issue 4; VOLUMES 1 AND 2 NEW/REVISED CODES

Idiopathic Normal Pressure Hydrocephalus

Effective October 1, 2007, a new code 331.5, Idiopathic normal pressure hydrocephalus (INPH), has been created to separately identify and distinguish INPH from secondary normal pressure hydrocephalus (NPH). Currently, secondary NPH is assigned to code 331.3, Communicating hydrocephalus. In the Tabular list, the narrative under code 331.3 has been revised to include secondary NPH. Normal pressure hydrocephalus (NPH) is an abnormal increase of cerebrospinal fluid (CSF) in the brain’s ventricles, or cavities, which occurs when the flow of cerebrospinal fluid (CSF) is blocked. The buildup of CSF leads to ventriculomegaly, enlargement of the...

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