2020 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
  • I65 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • Short description: Occls and stenosis of precerb art, not rslt in cereb infrc
  • The 2020 edition of ICD-10-CM I65 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of I65 - other international versions of ICD-10 I65 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as I65. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • insufficiency, NOS, of precerebral artery (
    ICD-10-CM Diagnosis Code G45
    • G45 Transient cerebral ischemic attacks and relat...
      • G45.0 Vertebro-basilar artery syndrome
      • G45.1 Carotid artery syndrome (hemispheric)
      • G45.2 Multiple and bilateral precerebral artery syn...
      • G45.3 Amaurosis fugax
      • G45.4 Transient global amnesia
      • G45.8 Other transient cerebral ischemic attacks and...
      • G45.9 Transient cerebral ischemic attack, unspecifi...
    G45.-
    )
  • insufficiency of precerebral arteries causing cerebral infarction (
    ICD-10-CM Diagnosis Code I63.0

    Cerebral infarction due to thrombosis of precerebral arteries

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    I63.0-
    ICD-10-CM Diagnosis Code I63.2

    Cerebral infarction due to unspecified occlusion or stenosis of precerebral arteries

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    I63.2
    )
Includes
Includes Help
"Includes" further defines, or give examples of, the content of the code or category.
  • embolism of precerebral artery
  • narrowing of precerebral artery
  • obstruction (complete) (partial) of precerebral artery
  • thrombosis of precerebral artery
The following code(s) above I65 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:
  • 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
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
ICD-10-CM Codes Adjacent To I65
I63.541 Cerebral infarction due to unspecified occlusion or stenosis of right cerebellar artery
I63.542 Cerebral infarction due to unspecified occlusion or stenosis of left cerebellar artery
I63.543 Cerebral infarction due to unspecified occlusion or stenosis of bilateral cerebellar arteries
I63.549 Cerebral infarction due to unspecified occlusion or stenosis of unspecified cerebellar artery
I63.59 Cerebral infarction due to unspecified occlusion or stenosis of other cerebral artery
I63.6 Cerebral infarction due to cerebral venous thrombosis, nonpyogenic
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

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