I66.1
Occlusion and stenosis of anterior cerebral artery
I66.1 is a non-billable ICD-10-CM code header for occlusion and stenosis of anterior cerebral artery. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are I66.11 Occlusion and stenosis of right anterior cerebral artery, I66.12 Occlusion and stenosis of left anterior cerebral artery, I66.13 Occlusion and stenosis of bilateral anterior cerebral arteries and I66.19 Occlusion and stenosis of unspecified anterior cerebral artery. Its coding notes include a Use additional code instruction, 2 Excludes1 entries and 10 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
Also from chapter/block level (8 notes)
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Includes
Further defines or gives examples of the content of the category.
- embolism of cerebral artery
- narrowing of cerebral artery
- obstruction (complete) (partial) of cerebral artery
- thrombosis of cerebral artery
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry