ICD-10-CM 2027
ICD-10 code for basilar trunk aneurysm
From the official ICD-10-CM alphabetic index entry “Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › basilar (trunk)”. Page updated September 29, 2026.
About coding basilar trunk aneurysm
The ICD-10-CM code for basilar trunk aneurysm is I72.5 (Aneurysm of other precerebral arteries).
Within I72, choose I72.5 (other precerebral arteries) 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), vertebral artery (I72.6), other specified arteries (I72.8) and unspecified site (I72.9).
The conditions in its Excludes2 note aren't part of I72.5, but may be coded alongside it if the patient has both: aneurysm of carotid artery (I72.0), aneurysm of vertebral artery (I72.6), dissection of carotid artery (I77.71), dissection of other precerebral arteries (I77.75) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about basilar trunk aneurysm ICD-10 codes
What is the ICD-10 code for basilar trunk aneurysm?
- I72.5 — Aneurysm of other precerebral arteries.
Is I72.5 billable?
- Yes. I72.5 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I72.5 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I72.5 as a principal diagnosis.
Is I72.5 a CC or MCC?
- No. I72.5 is neither a CC nor an MCC under MS-DRG v44.0.