I77.812 Thoracoabdominal aortic ectasia

Billable ICD-10-CM code, FY2026.

Applies from I77 Other disorders of arteries and arterioles

Excludes2 (not included here)

• collagen (vascular) diseases (M30-M36)
• hypersensitivity angiitis (M31.0)
• pulmonary artery (I28.-)

Applies from I77.81 Aortic ectasia

Applicable to

• Ectasis aorta

Excludes1 (never code together)

• aortic aneurysm and dissection (I71.-)

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)

• 447.73 Thoracoabdominal aortic ectasia

Diagnosis Index entries for I77.812

• Ectasia, ectasis › aorta › thoracoabdominal

Nearby codes

• I77.79 Dissection of other specified artery
• I77.8 Other specified disorders of arteries and arterioles
• I77.81 Aortic ectasia
• I77.810 Thoracic aortic ectasia
• I77.811 Abdominal aortic ectasia
• I77.812 Thoracoabdominal aortic ectasia (this code)
• I77.819 Aortic ectasia, unspecified site
• I77.82 Antineutrophilic cytoplasmic antibody [ANCA] vasculitis
• I77.89 Other specified disorders of arteries and arterioles
• I77.9 Disorder of arteries and arterioles, unspecified