ICDcodes.org
FY2027

I67.1 vs I72.0

I67.1 and I72.0 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.

The official note, declared on I72.0
aneurysm of internal carotid artery, intracranial portion (I67.1)
I67.1

Cerebral aneurysm, nonruptured

Billable
Chapter 9
Diseases of the circulatory system
Section
I60-I69
Use when the record says
  • Cerebral aneurysm NOS
  • Cerebral arteriovenous fistula, acquired
  • Internal carotid artery aneurysm, intracranial portion
  • Internal carotid artery aneurysm, NOS
Indexed under
  • Aneurysm › berry (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
  • Aneurysm › brain (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
  • Aneurysm › cavernous sinus (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
  • Aneurysm › circle of Willis (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
  • Aneurysm › miliary (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
I72.0

Aneurysm of carotid artery

Billable
Chapter 9
Diseases of the circulatory system
Section
I70-I79
Use when the record says
  • Aneurysm of common carotid artery
  • Aneurysm of external carotid artery
  • Aneurysm of internal carotid artery, extracranial portion
Indexed under
  • Aneurysm › carotid artery (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
  • Aneurysm › neck (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
  • Aneurysm › carotid artery › internal › extracranial portion (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)

Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027