ICD-10-CM 2027
ICD-10 code for Cylindroid aorta aneurysm
From the official ICD-10-CM alphabetic index entry “Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › cylindroid (aorta)”. Page updated September 29, 2026.
About coding Cylindroid aorta aneurysm
The ICD-10-CM code for Cylindroid aorta aneurysm is I71.9 (Aortic aneurysm of unspecified site, without rupture). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I71.9.
Within I71, choose I71.9 (Aortic aneurysm of unspecified site, without rupture) only when documentation doesn't support a more specific option: dissection of aorta (I71.0), thoracic aortic aneurysm, ruptured (I71.1), thoracic aortic aneurysm, without rupture (I71.2), abdominal aortic aneurysm, ruptured (I71.3), abdominal aortic aneurysm, without rupture (I71.4), thoracoabdominal aortic aneurysm, ruptured (I71.5), thoracoabdominal aortic aneurysm, without rupture (I71.6) and aortic aneurysm of unspecified site, ruptured (I71.8).
Code first , if applicable: syphilitic aortic aneurysm (A52.01) and traumatic aortic aneurysm (S25.09, S35.09).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific Cylindroid aorta aneurysm codes (official index)
Common questions about Cylindroid aorta aneurysm ICD-10 codes
What is the ICD-10 code for Cylindroid aorta aneurysm?
- I71.9 — Aortic aneurysm of unspecified site, without rupture. More specific codes apply when the documentation supports them: I71.8, A52.01.
What is the ICD-10 code for ruptured cylindroid aorta aneurysm?
- I71.8 — Aortic aneurysm of unspecified site, ruptured.
What is the ICD-10 code for syphilitic cylindroid aorta aneurysm?
- A52.01 — Syphilitic aneurysm of aorta.
Is I71.9 billable?
- Yes. I71.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I71.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I71.9 as a principal diagnosis.
Is I71.9 a CC or MCC?
- No. I71.9 is neither a CC nor an MCC under MS-DRG v44.0.