I68.2 Cerebral arteritis in other diseases classified elsewhere

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

Excludes1 (never code together)

• cerebral arteritis (in):
• listerosis (A32.89)
• systemic lupus erythematosus (M32.19)
• syphilis (A52.04)
• tuberculosis (A18.89)

Code first

• underlying disease

MS-DRG index

Defines the logic of DRG(s) 102-103 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 437.4 Cerebral arteritis (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Code annotations containing back-references to I68.2

Back-references to I68

• 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 I68.2

• Arteritis › cerebral › in › diseases classified elsewhere

Nearby codes

• I68 Cerebrovascular disorders in diseases classified elsewhere
• I68.0 Cerebral amyloid angiopathy
• I68.2 Cerebral arteritis in other diseases classified elsewhere (this code)
• I68.8 Other cerebrovascular disorders in diseases classified elsewhere