ICD-10-CM 2027
ICD-10 code for infective aneurysm
From the official ICD-10-CM alphabetic index entry “Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › infective”. Page updated September 29, 2026.
About coding infective aneurysm
The ICD-10-CM code for infective aneurysm is I72.9 (Aneurysm of unspecified site). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on I72.9.
Within I72, choose I72.9 (unspecified site) only when documentation doesn't support a more specific option: carotid artery (I72.0), artery of upper extremity (I72.1), renal artery (I72.2), iliac artery (I72.3), artery of lower extremity (I72.4), other precerebral arteries (I72.5), vertebral artery (I72.6) and other specified arteries (I72.8).
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 infective aneurysm codes (official index)
- endocardial (any valve) I33.0 — Acute and subacute infective endocarditis
Common questions about infective aneurysm ICD-10 codes
What is the ICD-10 code for infective aneurysm?
- I72.9 — Aneurysm of unspecified site. More specific codes apply when the documentation supports them: I33.0.
What is the ICD-10 code for endocardial infective aneurysm?
- I33.0 — Acute and subacute infective endocarditis.
Is I72.9 billable?
- Yes. I72.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I72.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I72.9 as a principal diagnosis.
Is I72.9 a CC or MCC?
- No. I72.9 is neither a CC nor an MCC under MS-DRG v44.0.