ICD-10-CM 2027
ICD-10 code for aorta ectasia
From the official ICD-10-CM alphabetic index entry “Ectasia, ectasis › aorta”. Page updated September 29, 2026.
About coding aorta ectasia
The ICD-10-CM code for aorta ectasia is I77.819 (Aortic ectasia, unspecified site). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I77.819.
Within I77.81, choose I77.819 (unspecified site) only when documentation doesn't support a more specific option: thoracic aortic ectasia (I77.810), abdominal aortic ectasia (I77.811) and thoracoabdominal aortic ectasia (I77.812).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 299 (Peripheral Vascular Disorders with MCC, relative weight 1.5842), DRG 300 (Peripheral Vascular Disorders with CC, relative weight 1.0464) and DRG 301 (Peripheral Vascular Disorders without CC/MCC, relative weight 0.7133), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific aorta ectasia codes (official index)
Common questions about aorta ectasia ICD-10 codes
What is the ICD-10 code for aorta ectasia?
- I77.819 — Aortic ectasia, unspecified site. More specific codes apply when the documentation supports them: I77.811, I77.810, I77.812.
What is the ICD-10 code for abdominal aorta ectasia?
- I77.811 — Abdominal aortic ectasia.
What is the ICD-10 code for thoracic aorta ectasia?
- I77.810 — Thoracic aortic ectasia.
What is the ICD-10 code for thoracoabdominal aorta ectasia?
- I77.812 — Thoracoabdominal aortic ectasia.
Is I77.819 billable?
- Yes. I77.819 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I77.819 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I77.819 as a principal diagnosis.
Is I77.819 a CC or MCC?
- No. I77.819 is neither a CC nor an MCC under MS-DRG v44.0.