I79.0 Aneurysm of aorta in diseases classified elsewhere

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• syphilitic aneurysm (A52.01)

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)

• 441.9 Aortic aneurysm of unspecified site without mention of rupture (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 I79.0

• Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › syphilitic (aorta) › congenital (late)
• Syphilis, syphilitic (acquired) › aneurysm (aorta) (ruptured) › congenital

Nearby codes

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