ICD-9 Code 436 - Acute, but ill-defined, cerebrovascular disease

ICD-9-CM Diagnosis Code 436

Diagnosis Code: 436 (Raw: 436)

Description: Acute, but ill-defined, cerebrovascular disease

Classification: International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM)

Fiscal Year: 2026 Reference

CMS Section 111 Status: Valid for reporting.

Overview & Historical Usage

ICD-9-CM code 436 is designated for Acute, but ill-defined, cerebrovascular disease. While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical clinical data analysis.