FY2027
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Excludes1 pair

I67.1 vs I72.0

I67.1 and I72.0 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

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 (congenital) (nonruptured)
  • Aneurysm › brain
  • Aneurysm › cavernous sinus
  • Aneurysm › circle of Willis
  • Aneurysm › miliary (congenital)
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 (common) (external)
  • Aneurysm › neck
  • Aneurysm › carotid artery › internal › extracranial portion

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