Alphabetic Index FY2027

G46.3

Brain stem stroke syndrome

FY2027Chapter 6: Diseases of the nervous system/G40–G47 Episodic and paroxysmal disorders

BillableComplete code, valid to report

G46.3 (also written G463) is a billable ICD-10-CM diagnosis code for brain stem stroke syndrome. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 9 codes in category G46 (Vascular syndromes of brain in cerebrovascular diseases). The Alphabetic Index lists it under 24 entries. Its coding notes include a Code first instruction and 8 Excludes2 entries.

Code first

If the underlying condition listed here is present and known, sequence it first.

Inherited from G46 Vascular syndromes of brain in cerebrovascular diseases
  • underlying cerebrovascular disease (I60-I69)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (8 notes)
Inherited from Chapter 6 Diseases of the nervous system
  • 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)

Inclusion terms

Conditions classified to this code.

This code
  • Benedikt syndrome
  • Claude syndrome
  • Foville syndrome
  • Millard-Gubler syndrome
  • Wallenberg syndrome
  • Weber syndrome

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 24 entries

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