I67.83 Posterior reversible encephalopathy syndrome

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• PRES

Applies from I67 Other cerebrovascular diseases

Excludes1 (never code together)

• Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5-)
• Occlusion and stenosis of precerebral artery causing cerebral infarction (I63.2-)

Excludes2 (not included here)

• sequelae of the listed conditions (I69.8)

MS-DRG index

Defines the logic of DRG(s) 070-072 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 348.39 Other encephalopathy (approximate)

Code annotations containing back-references to I67.83

Back-references to I67

• Type 1 Excludes: G31.84 Mild cognitive impairment of uncertain or unknown etiology ("cerebrovascular diseases (I60-I69)")
• Code First: G46 Vascular syndromes of brain in cerebrovascular diseases ("underlying cerebrovascular disease (I60-I69)")
• Type 2 Excludes: I10 Essential (primary) hypertension ("essential (primary) hypertension involving vessels of brain (I60-I69)")
• Type 2 Excludes: I15 Secondary hypertension ("secondary hypertension involving vessels of brain (I60-I69)")

Diagnosis Index entries for I67.83

• PRES (posterior reversible encephalopathy syndrome)
• Syndrome › posterior › reversible encephalopathy (PRES)

Nearby codes

• I67.6 Nonpyogenic thrombosis of intracranial venous system
• I67.7 Cerebral arteritis, not elsewhere classified
• I67.8 Other specified cerebrovascular diseases
• I67.81 Acute cerebrovascular insufficiency
• I67.82 Cerebral ischemia
• I67.83 Posterior reversible encephalopathy syndrome (this code)
• I67.84 Cerebral vasospasm and vasoconstriction
• I67.841 Reversible cerebrovascular vasoconstriction syndrome
• I67.848 Other cerebrovascular vasospasm and vasoconstriction
• I67.85 Hereditary cerebrovascular diseases
• I67.850 Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy