FY2027
MenuClose
Excludes1 pair

T78.2- vs T81.1-

T78.2 and T81.1 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

The official note, declared on T81.1
anaphylactic shock NOS (T78.2)
T78.2

Anaphylactic shock, unspecified

Not billable
Chapter 19
Injury, poisoning and certain other consequences of external causes
Section
T66-T78
Use when the record says
  • Allergic shock
  • Anaphylactic reaction
  • Anaphylaxis
Indexed under
  • Allergy, allergic › anaphylactic reaction or shock
  • Allergy, allergic › shock (anaphylactic)
  • Shock › anaphylactic
T81.1

Postprocedural shock

Not billable
Chapter 19
Injury, poisoning and certain other consequences of external causes
Section
T80-T88
Use when the record says
  • Shock during or resulting from a procedure, not elsewhere classified

Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027