2019 ICD-10-CM Diagnosis Code G45.9

Transient cerebral ischemic attack, unspecified

    2016 2017 2018 2019 Billable/Specific Code
  • G45.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM G45.9 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of G45.9 - other international versions of ICD-10 G45.9 may differ.
Applicable To
  • Spasm of cerebral artery
  • TIA
  • Transient cerebral ischemia NOS
The following code(s) above G45.9 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 G45.9:
  • G00-G99
    2019 ICD-10-CM Range G00-G99

    Diseases of the nervous 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)
    Diseases of the nervous system
  • G45
    ICD-10-CM Diagnosis Code G45

    Transient cerebral ischemic attacks and related syndromes

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • neonatal cerebral ischemia (P91.0)
    • transient retinal artery occlusion (H34.0-)
    Transient cerebral ischemic attacks and related syndromes
Approximate Synonyms
  • Transient cerebral ischemia
  • Transient ischemic attack
Clinical Information
  • A brief attack (from a few minutes to an hour) of cerebral dysfunction of vascular origin, with no persistent neurological deficit.
  • A disorder characterized by a brief attack (less than 24 hours) of cerebral dysfunction of vascular origin, with no persistent neurological deficit.
  • A transient ischemic attack (tia) is a stroke that comes and goes quickly. It happens when the blood supply to part of the brain stops briefly. Symptoms of a tia are like other stroke symptoms, but do not last as long. They happen suddenly, and include
    • numbness or weakness, especially on one side of the body
    • confusion or trouble speaking or understanding speech
    • trouble seeing in one or both eyes
    • loss of balance or coordination
    most symptoms of a tia disappear within an hour, although they may last for up to 24 hours. Because you cannot tell if these symptoms are from a tia or a stroke, you should get to the hospital quickly. Tias are often a warning sign for future strokes. Taking medicine, such as blood thinners, may reduce your risk of a stroke. Your doctor might also recommend surgery.
  • Brief reversible episodes of focal, nonconvulsive ischemic dysfunction of the brain having a duration of less than 24 hours, and usually less than one hour, caused by transient thrombotic or embolic blood vessel occlusion or stenosis. Events may be classified by arterial distribution, temporal pattern, or etiology (e.g., embolic vs. Thrombotic). (from Adams et al., Principles of Neurology, 6th ed, pp814-6)
  • Mini stroke which is recoverable
  • Recurring, transient episodes of neurologic dysfunction caused by cerebral ischemia; onset is usually sudden, often when the patient is active; the attack may last a few seconds to several hours; neurologic symptoms depend on the artery involved.
ICD-10-CM G45.9 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 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
  • 069 Transient ischemia without thrombolytic

Convert G45.9 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
Code annotations containing back-references to G45.9:
  • Type 1 Excludes: R29.5
    ICD-10-CM Diagnosis Code R29.5

    Transient paralysis

      2016 2017 2018 2019 Billable/Specific Code
    Code First
    Type 1 Excludes
    • transient ischemic attack (G45.9)
  • Type 2 Excludes: I73
    , I69.322
    , I69.351
    ICD-10-CM Diagnosis Code I73

    Other peripheral vascular diseases

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 2 Excludes
    ICD-10-CM Diagnosis Code I69.322

    Dysarthria following cerebral infarction

      2016 2017 2018 2019 Billable/Specific Code POA Exempt
    Type 2 Excludes
    • transient ischemic attack (TIA) (G45.9)
    ICD-10-CM Diagnosis Code I69.351

    Hemiplegia and hemiparesis following cerebral infarction affecting right dominant side

      2016 2017 2018 2019 Billable/Specific Code POA Exempt
    Type 2 Excludes
    • transient ischemic attack (TIA) (G45.9)

Diagnosis Index entries containing back-references to G45.9:
  • Angiospasm (peripheral) (traumatic) (vessel) I73.9
    ICD-10-CM Diagnosis Code I73.9

    Peripheral vascular disease, unspecified

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Intermittent claudication
    • Peripheral angiopathy NOS
    • Spasm of artery
    Type 1 Excludes
    • cerebral G45.9
  • Attack, attacks
  • Claudication (intermittent) I73.9
    ICD-10-CM Diagnosis Code I73.9

    Peripheral vascular disease, unspecified

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Intermittent claudication
    • Peripheral angiopathy NOS
    • Spasm of artery
    Type 1 Excludes
    • cerebral G45.9 (artery)
  • Disease, diseased - see also Syndrome
    • angiospastic I73.9
      ICD-10-CM Diagnosis Code I73.9

      Peripheral vascular disease, unspecified

        2016 2017 2018 2019 Billable/Specific Code
      Applicable To
      • Intermittent claudication
      • Peripheral angiopathy NOS
      • Spasm of artery
      Type 1 Excludes
      • cerebral G45.9
  • Ischemia, ischemic I99.8
    ICD-10-CM Diagnosis Code I99.8

    Other disorder of circulatory system

      2016 2017 2018 2019 Billable/Specific Code
    • cerebral (chronic) (generalized) I67.82
      ICD-10-CM Diagnosis Code I67.82

      Cerebral ischemia

        2016 2017 2018 2019 Billable/Specific Code
      Applicable To
      • Chronic cerebral ischemia
      • intermittent G45.9
      • transient G45.9
  • Spasm(s) R25.2
    - see also condition
    ICD-10-CM Diagnosis Code R25.2

    Cramp and spasm

      2016 2017 2018 2019 Billable/Specific Code
    Type 2 Excludes
    • artery I73.9
      ICD-10-CM Diagnosis Code I73.9

      Peripheral vascular disease, unspecified

        2016 2017 2018 2019 Billable/Specific Code
      Applicable To
      • Intermittent claudication
      • Peripheral angiopathy NOS
      • Spasm of artery
      Type 1 Excludes
      • cerebral G45.9
    • cerebral G45.9 (arteries) (vascular)

ICD-10-CM Codes Adjacent To G45.9
G44.84 Primary exertional headache
G44.85 Primary stabbing headache
G44.89 Other headache syndrome
G45 Transient cerebral ischemic attacks and related syndromes
G45.0 Vertebro-basilar artery syndrome
G45.1 Carotid artery syndrome (hemispheric)
G45.2 Multiple and bilateral precerebral artery syndromes
G45.3 Amaurosis fugax
G45.4 Transient global amnesia
G45.8 Other transient cerebral ischemic attacks and related syndromes
G45.9 Transient cerebral ischemic attack, unspecified
G46 Vascular syndromes of brain in cerebrovascular diseases
G46.0 Middle cerebral artery syndrome
G46.1 Anterior cerebral artery syndrome
G46.2 Posterior cerebral artery syndrome
G46.3 Brain stem stroke syndrome
G46.4 Cerebellar stroke syndrome
G46.5 Pure motor lacunar syndrome
G46.6 Pure sensory lacunar syndrome
G46.7 Other lacunar syndromes
G46.8 Other vascular syndromes of brain in cerebrovascular diseases

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