2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Circulatory System 390-459 > Cerebrovascular Disease 430-438 > Other And Ill-Defined Cerebrovascular Disease 437.* > 2006 ICD-9-CM Diagnosis 437.2 Hypertensive encephalopathy View the most recent version of ICD-9-CM 437.2 Brain dysfunction or damage resulting from sustained MALIGNANT HYPERTENSION. When BLOOD PRESSURE exceeds the limits of cerebral autoregulation, cerebral blood flow is impaired (BRAIN ISCHEMIA). Clinical manifestations include HEADACHE; NAUSEA; VOMITING; SEIZURES; altered mental status (in some cases progressing to COMA); PAPILLEDEMA; and RETINAL HEMORRHAGE. 437.2 is a specific code that can be used to specify a diagnosis 437.2 contains 4 index entries View the ICD-9-CM Volume 1 437.* hierarchy  Index entries containing 437.2: Degeneration, degenerative cerebrovascular 437.1 due to hypertension 437.2 Encephalopathy (acute) 348.30 hypertensive 437.2 Lesion(s) brain 348.8 vascular (see also Lesion, cerebrovascular) 437.9 hypertensive 437.2 cerebrovascular (see also Disease, cerebrovascular NEC) 437.9 hypertensive 437.2