2019 ICD-10-CM Diagnosis Code G45.4

Transient global amnesia

    2016 2017 2018 2019 Billable/Specific Code
  • G45.4 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 G45.4 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of G45.4 - other international versions of ICD-10 G45.4 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 G45.4. 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.
  • amnesia NOS (
    ICD-10-CM Diagnosis Code R41.3

    Other amnesia

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Amnesia NOS
    • Memory loss NOS
    Type 1 Excludes
    • amnestic disorder due to known physiologic condition (F04)
    • amnestic syndrome due to psychoactive substance use (F10-F19 with 5th character .6)
    • mild memory disturbance due to known physiological condition (F06.8)
    • transient global amnesia (G45.4)
    R41.3
    )
The following code(s) above G45.4 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 G45.4:
  • 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
Clinical Information
  • A condition characterized by sudden, temporary, usually short-lived memory loss, not associated with a neurologic disorder. Affected individuals lose memory function for recent events and have a decreased ability to retain new information. It is usually a solitary event.
  • A syndrome characterized by a transient loss of the ability to form new memories. It primarily occurs in middle aged or elderly individuals, and episodes may last from minutes to hours. During the period of amnesia, immediate and recent memory abilities are impaired, but the level of consciousness and ability to perform other intellectual tasks are preserved. The condition is related to bilateral dysfunction of the medial portions of each temporal lobe. Complete recovery normally occurs, and recurrences are unusual. (from Adams et al., Principles of Neurology, 6th ed, pp429-30)
ICD-10-CM G45.4 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 070 Nonspecific cerebrovascular disorders with mcc
  • 071 Nonspecific cerebrovascular disorders with cc
  • 072 Nonspecific cerebrovascular disorders without cc/mcc

Convert G45.4 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 G45.4:
  • Type 1 Excludes: R41.3
    ICD-10-CM Diagnosis Code R41.3

    Other amnesia

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Amnesia NOS
    • Memory loss NOS
    Type 1 Excludes
    • amnestic disorder due to known physiologic condition (F04)
    • amnestic syndrome due to psychoactive substance use (F10-F19 with 5th character .6)
    • mild memory disturbance due to known physiological condition (F06.8)
    • transient global amnesia (G45.4)

Diagnosis Index entries containing back-references to G45.4:
  • Amnesia R41.3
    ICD-10-CM Diagnosis Code R41.3

    Other amnesia

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Amnesia NOS
    • Memory loss NOS
    Type 1 Excludes
    • amnestic disorder due to known physiologic condition (F04)
    • amnestic syndrome due to psychoactive substance use (F10-F19 with 5th character .6)
    • mild memory disturbance due to known physiological condition (F06.8)
    • transient global amnesia (G45.4)
    • transient global G45.4

ICD-10-CM Codes Adjacent To G45.4
G44.82 Headache associated with sexual activity
G44.83 Primary cough headache
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

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