Occlusion and stenosis of unspecified middle cerebral artery
Billable / specific
I66.09 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.
Inclusion terms
Includes (from I66)
- embolism of cerebral artery
- narrowing of cerebral artery
- obstruction (complete) (partial) of cerebral artery
- thrombosis of cerebral artery
Excludes1
Not coded here — never report together with this code.
Excludes2
Not included here — may be reported together when both conditions exist.
- certain conditions originating in the perinatal period (P04-P96) (from I66)
- certain infectious and parasitic diseases (A00-B99) (from I66)
- complications of pregnancy, childbirth and the puerperium (O00-O9A) (from I66)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) (from I66)
- endocrine, nutritional and metabolic diseases (E00-E88) (from I66)
- injury, poisoning and certain other consequences of external causes (S00-T88) (from I66)
- neoplasms (C00-D49) (from I66)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) (from I66)
- systemic connective tissue disorders (M30-M36) (from I66)
- transient cerebral ischemic attacks and related syndromes (G45.-) (from I66)
Use additional code
Add a code to identify the following, if applicable.
- code to identify presence of: (from I66)
- alcohol abuse and dependence (F10.-) (from I66)
- exposure to environmental tobacco smoke (Z77.22) (from I66)
- history of tobacco dependence (Z87.891) (from I66)
- hypertension (I10-I1A) (from I66)
- occupational exposure to environmental tobacco smoke (Z57.31) (from I66)
- tobacco dependence (F17.-) (from I66)
- tobacco use (Z72.0) (from I66)
Parent code
- I66.0Occlusion and stenosis of middle cerebral arteryHeader