I67.4Hypertensive encephalopathy

I67.4 is the ICD-10-CM diagnosis code for hypertensive encephalopathy. It belongs to category I67 (other cerebrovascular diseases), block I60-I69 (cerebrovascular diseases) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within I67 (other cerebrovascular diseases), I67.4 is specifically for hypertensive encephalopathy. Related codes cover dissection of cerebral arteries, nonruptured (I67.0), cerebral aneurysm, nonruptured (I67.1), cerebral atherosclerosis (I67.2), progressive vascular leukoencephalopathy (I67.3), Moyamoya disease (I67.5), nonpyogenic thrombosis of intracranial venous system (I67.6), cerebral arteritis, not elsewhere classified (I67.7), other specified cerebrovascular diseases (I67.8) and 1 more.

The conditions in its Excludes2 note aren't part of I67.4, but may be coded alongside it if the patient has both: insufficiency, NOS, of precerebral arteries (G45.2).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 070 (Other Cerebrovascular Disorders with MCC, relative weight 1.6093), DRG 071 (Other Cerebrovascular Disorders with CC, relative weight 1.0177) and DRG 072 (Other Cerebrovascular Disorders without CC/MCC, relative weight 0.7348), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 437.2 (hypertensive encephalopathy).