2020 ICD-10-CM Diagnosis Code I65.1

Occlusion and stenosis of basilar artery

    2016 2017 2018 2019 2020 Billable/Specific Code
  • I65.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM I65.1 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of I65.1 - other international versions of ICD-10 I65.1 may differ.
The following code(s) above I65.1 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 I65.1:
  • I00-I99
    2020 ICD-10-CM Range I00-I99

    Diseases of the circulatory system

    Type 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.-)
    Diseases of the circulatory system
  • I60-I69
    2020 ICD-10-CM Range I60-I69

    Cerebrovascular diseases

    Type 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-I16)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
    Cerebrovascular diseases
  • I65
    ICD-10-CM Diagnosis Code I65

    Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Includes
    • embolism of precerebral artery
    • narrowing of precerebral artery
    • obstruction (complete) (partial) of precerebral artery
    • thrombosis of precerebral artery
    Type 1 Excludes
    • insufficiency, NOS, of precerebral artery (G45.-)
    • insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2)
    Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
Approximate Synonyms
  • Basilar artery occlusion
  • Basilar artery stenosis
  • Occlusion of basilar artery
  • Stenosis of basilar artery
ICD-10-CM I65.1 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 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

Convert I65.1 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
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to I65.1:
  • Type 2 Excludes: I74
    ICD-10-CM Diagnosis Code I74

    Arterial embolism and thrombosis

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code First
    • embolism and thrombosis complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2)
    • embolism and thrombosis complicating pregnancy, childbirth and the puerperium (O88.-)
    Includes
    • embolic infarction
    • embolic occlusion
    • thrombotic infarction
    • thrombotic occlusion
    Type 2 Excludes

Diagnosis Index entries containing back-references to I65.1:
  • Embolism (multiple) (paradoxical) I74.9
    ICD-10-CM Diagnosis Code I74.9

    Embolism and thrombosis of unspecified artery

      2016 2017 2018 2019 2020 Billable/Specific Code
    • basilar I65.1 (artery)
  • Occlusion, occluded

ICD-10-CM Codes Adjacent To I65.1
I63.8 Other cerebral infarction
I63.81 …… due to occlusion or stenosis of small artery
I63.89 Other cerebral infarction
I63.9 Cerebral infarction, unspecified
I65 Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
I65.0 Occlusion and stenosis of vertebral artery
I65.01 Occlusion and stenosis of right vertebral artery
I65.02 Occlusion and stenosis of left vertebral artery
I65.03 Occlusion and stenosis of bilateral vertebral arteries
I65.09 Occlusion and stenosis of unspecified vertebral artery
I65.1 Occlusion and stenosis of basilar artery
I65.2 Occlusion and stenosis of carotid artery
I65.21 Occlusion and stenosis of right carotid artery
I65.22 Occlusion and stenosis of left carotid artery
I65.23 Occlusion and stenosis of bilateral carotid arteries
I65.29 Occlusion and stenosis of unspecified carotid artery
I65.8 Occlusion and stenosis of other precerebral arteries
I65.9 Occlusion and stenosis of unspecified precerebral artery
I66 Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
I66.0 Occlusion and stenosis of middle cerebral artery
I66.01 Occlusion and stenosis of right middle cerebral artery

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.