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ICD-10-CM Codes
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I00-I99
Diseases of the circulatory system
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I60-I69
Cerebrovascular diseases
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I66-
Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
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2017/18 ICD-10-CM Diagnosis Code I66.21
Occlusion and stenosis of right posterior cerebral artery
2016 2017 2018 Billable/Specific Code
- I66.21 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2018 edition of ICD-10-CM I66.21 became effective on October 1, 2017.
- This is the American ICD-10-CM version of I66.21 - other international versions of ICD-10 I66.21 may differ.
The following code(s) above
I66.21 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
- Applicable To annotations, or
- Code Also annotations, or
- Code First annotations, or
- Excludes1 annotations, or
- Excludes2 annotations, or
- Includes annotations, or
- Note annotations, or
- Use Additional annotations
that may be applicable to
I66.21:
- I00-I99
2018 ICD-10-CM Range I00-I99
Diseases of the circulatory systemType 2 Excludes- 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.-)
- I60-I69
2018 ICD-10-CM Range I60-I69
Cerebrovascular diseasesType 1 Excludes- traumatic intracranial hemorrhage (S06.-)
Use Additional- code to identify presence of:
- alcohol abuse and dependence (F10.-)
- exposure to environmental tobacco smoke (Z77.22)
- history of tobacco dependence (Z87.891)
- hypertension (I10-I15)
- occupational exposure to environmental tobacco smoke (Z57.31)
- tobacco dependence (F17.-)
- tobacco use (Z72.0)
- I66
ICD-10-CM Diagnosis Code I66
Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
2016 2017 2018 Non-Billable/Non-Specific Code
Includes- embolism of cerebral artery
- narrowing of cerebral artery
- obstruction (complete) (partial) of cerebral artery
- thrombosis of cerebral artery
Type 1 Excludes- Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)
- Right posterior cerebral artery occlusion
ICD-10-CM I66.21 is grouped within Diagnostic Related Group(s) (MS-DRG v35.0):
- 061 Ischemic stroke, precerebral occlusion or transient ischemia with thrombolytic agent with mcc
- 062 Ischemic stroke, precerebral occlusion or transient ischemia with thrombolytic agent with cc
- 063 Ischemic stroke, precerebral occlusion or transient ischemia with thrombolytic agent without cc/mcc
- 067 Nonspecific cva and precerebral occlusion without infarction with mcc
- 068 Nonspecific cva and precerebral occlusion without infarction without mcc
- 793 Full term neonate with major problems
Convert I66.21 to ICD-9-CM
Code History
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 2017 (effective 10/1/2016): No change
- 2018 (effective 10/1/2017): No change
ICD-10-CM Codes Adjacent To I66.21
I66.01 Occlusion and stenosis of right middle cerebral artery
I66.02 Occlusion and stenosis of left middle cerebral artery
I66.03 Occlusion and stenosis of bilateral middle cerebral arteries
I66.09 Occlusion and stenosis of unspecified middle cerebral artery
I66.1 Occlusion and stenosis of anterior cerebral artery
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
I66.19 Occlusion and stenosis of unspecified anterior cerebral artery
I66.2 Occlusion and stenosis of posterior cerebral artery
I66.21
Occlusion and stenosis of right posterior cerebral artery
I66.22 Occlusion and stenosis of left posterior cerebral artery
I66.23 Occlusion and stenosis of bilateral posterior cerebral arteries
I66.29 Occlusion and stenosis of unspecified posterior cerebral artery
I66.3 Occlusion and stenosis of cerebellar arteries
I66.8 Occlusion and stenosis of other cerebral arteries
I66.9 Occlusion and stenosis of unspecified cerebral artery
I67 Other cerebrovascular diseases
I67.0 Dissection of cerebral arteries, nonruptured
I67.1 Cerebral aneurysm, nonruptured
I67.2 Cerebral atherosclerosis
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
