ICD-10-CM 2027
ICD-10 code for aorta nonsyphilitic disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › aorta (nonsyphilitic)”. Page updated September 29, 2026.
About coding aorta nonsyphilitic disease
The ICD-10-CM code for aorta nonsyphilitic disease is I77.9 (Disorder of arteries and arterioles, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on I77.9.
Within I77, choose I77.9 (Disorder of arteries and arterioles, unspecified) only when documentation doesn't support a more specific option: arteriovenous fistula, acquired (I77.0), stricture of artery (I77.1), rupture of artery (I77.2), arterial fibromuscular dysplasia (I77.3), celiac artery compression syndrome (I77.4), necrosis of artery (I77.5), arteritis, unspecified (I77.6), other arterial dissection (I77.7) and 1 more.
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 nonsyphilitic disease codes (official index)
- syphilitic NEC A52.02 — Syphilitic aortitis
Common questions about aorta nonsyphilitic disease ICD-10 codes
What is the ICD-10 code for aorta nonsyphilitic disease?
- I77.9 — Disorder of arteries and arterioles, unspecified. More specific codes apply when the documentation supports them: A52.02.
What is the ICD-10 code for syphilitic nec aorta nonsyphilitic disease?
- A52.02 — Syphilitic aortitis.
Is I77.9 billable?
- Yes. I77.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I77.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I77.9 as a principal diagnosis.
Is I77.9 a CC or MCC?
- No. I77.9 is neither a CC nor an MCC under MS-DRG v44.0.