I79.1 Aortitis in diseases classified elsewhere

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• syphilitic aortitis (A52.02)

Code first

• underlying disease

Risk adjustment (HCC)

• CMS-HCC V22: HCC 108 — Vascular Disease
• ESRD V24: HCC 108

MS-DRG index

Defines the logic of DRG(s) 299-301 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 443.81 Peripheral angiopathy in diseases classified elsewhere (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.

Diagnosis Index entries for I79.1

• Aortitis (nonsyphilitic) (calcific) › syphilitic › congenital

Nearby codes

• I79 Disorders of arteries, arterioles and capillaries in diseases classified elsewhere
• I79.0 Aneurysm of aorta in diseases classified elsewhere
• I79.1 Aortitis in diseases classified elsewhere (this code)
• I79.8 Other disorders of arteries, arterioles and capillaries in diseases classified elsewhere