DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

G45 Transient cerebral ischemic attacks and related syndromes

  • Header · not billable

G45 is not billable. The category heads 7 billable codes in FY2027: the 7 codes directly below it.

Index → code

  • Syndromebasilar artery → G45.0
  • Amnesiatransient global → G45.4
  • Syndromesubclavian steal → G45.8

Where it sits

  1. Chapter 6 Diseases of the nervous system (G00-G99)
  2. G40-G47 Episodic and paroxysmal disorders (G40-G47)
  3. G45 Transient cerebral ischemic attacks and related syndromes
Billable codes
7
Subdivisions
7
CC / MCC codes
6 / 0
HCC V28 codes
0
New FY2027
0
Index entries
25

Codes in G45

  1. G45.0
    Vertebro-basilar artery syndrome
    BillableCC
  2. G45.1
    Carotid artery syndrome (hemispheric)
    BillableCC
  3. G45.2
    Multiple and bilateral precerebral artery syndromes
    BillableCC
  4. G45.3
    Amaurosis fugax
    BillableCC
  5. G45.4
    Transient global amnesia
    Billable
    Excludes1 1

    Excludes1

    • amnesia NOS (R41.3) R41.3
  6. G45.8
    Other transient cerebral ischemic attacks and related syndromes
    BillableCC
  7. G45.9
    Transient cerebral ischemic attack, unspecified
    BillableCC
    Inclusion terms 3

    Inclusion terms

    • Spasm of cerebral artery
    • TIA
    • Transient cerebral ischemia NOS

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At G45

Excludes1

  • neonatal cerebral ischemia (P91.0) P91.0
  • transient retinal artery occlusion (H34.0-) H34.0

Notes that also apply

Chapter 6 instructions (Excludes2 8): printed on the chapter 6 page.

Index entries

  • Syndromebasilar artery → G45.0
  • Syndromevertebro-basilar artery → G45.0
  • Syndromeprecerebral artery (multiple) (bilateral) → G45.2
  • Amaurosis (acquired) (congenital)fugax → G45.3
  • Amnesiatransient global → G45.4
  • Syndromesubclavian steal → G45.8
  • Angiospasm (peripheral) (traumatic) (vessel)cerebral → G45.9
  • Attack, attackstransient ischemic (TIA) → G45.9
  • Claudication (intermittent)cerebral (artery) → G45.9
  • Spasm(s), spastic, spasticitycerebral (arteries) (vascular) → G45.9
  • Insufficiency, insufficientarterialbasilar → G45.0
  • Insufficiency, insufficientarterialvertebral → G45.0
  • Syndromevertebralartery → G45.0
  • Syndromevertebralsteal → G45.0
  • Insufficiency, insufficientarterialcarotid (hemispheric) → G45.1
  • Syndromecarotidartery (hemispheric) (internal) → G45.1
  • Insufficiency, insufficientarterialprecerebral (multiple) (bilateral) → G45.2
  • Attack, attackstransient ischemic (TIA)specified NEC → G45.8
  • Insufficiency, insufficientcerebrovascular (acute)with transient focal neurological signs and symptoms → G45.8
  • Ischemia, ischemiccerebral (chronic) (generalized)recurrent focal → G45.8
  • Syndromestealsubclavian → G45.8
  • Disease, diseasedangiospasticcerebral → G45.9
  • Ischemia, ischemiccerebral (chronic) (generalized)intermittent → G45.9
  • Ischemia, ischemiccerebral (chronic) (generalized)transient → G45.9
  • Spasm(s), spastic, spasticityarterycerebral → G45.9

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy