ICD-10-CM 2027
ICD-10 code for Fernels' disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › Fernels' (aortic aneurysm)”. Page updated September 29, 2026.
About coding Fernels' disease
The ICD-10-CM code for Fernels' disease is I71.9 (Aortic aneurysm of unspecified site, without rupture).
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.
Common questions about Fernels' disease ICD-10 codes
What is the ICD-10 code for Fernels' disease?
- I71.9 — Aortic aneurysm of unspecified site, without rupture.
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.