FY2027 ICD-10-CM reference
G45: Transient cerebral ischemic attacks and related syndromes
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Transient cerebral ischemic attacks and related syndromes. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
More specific FY2027 codes
- G45.0: Vertebro-basilar artery syndromeBillable code
- G45.1: Carotid artery syndrome (hemispheric)Billable code
- G45.2: Multiple and bilateral precerebral artery syndromesBillable code
- G45.3: Amaurosis fugaxBillable code
- G45.4: Transient global amnesiaBillable code
- G45.8: Other transient cerebral ischemic attacks and related syndromesBillable code
- G45.9: Transient cerebral ischemic attack, unspecifiedBillable code
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: G00-G99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: G00-G99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: G00-G99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: G00-G99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: G00-G99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: G00-G99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: G00-G99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: G00-G99 (chapter, inherited).
Excludes1
neonatal cerebral ischemia (P91.0)
Source: G45 (category, direct).
Excludes1
transient retinal artery occlusion (H34.0-)
Source: G45 (category, direct).
Compare the FY2027 additions, removals and billable-status changes
What does G45 mean in FY2027?
The official ICD-10-CM descriptor is Transient cerebral ischemic attacks and related syndromes. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is G45 billable in FY2027?
The FY2027 order file marks G45 as a nonbillable heading. Select a complete billable child code.
Does G45 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition