ICD-10-CM 2027
ICD-10 code for shock anaphylactic allergy
From the official ICD-10-CM alphabetic index entry “Allergy, allergic (reaction) (to) › shock (anaphylactic)”. Page updated September 29, 2026.
About coding shock anaphylactic allergy
The ICD-10-CM code for shock anaphylactic allergy is T78.2 (Anaphylactic shock, unspecified). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on T78.2.
Within T78, choose T78.2 (Anaphylactic shock, unspecified) only when documentation doesn't support a more specific option: anaphylactic reaction due to food (T78.0), other adverse food reactions, not elsewhere classified (T78.1), Angioneurotic edema (T78.3), other and unspecified allergy (T78.4) and other adverse effects, not elsewhere classified (T78.8).
Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.
Don't report T78.2 together with the conditions in its Excludes1 note: anaphylactic reaction or shock due to adverse effect of correct medicinal substance properly administered (T88.6), anaphylactic reaction or shock due to adverse food reaction (T78.0-) and anaphylactic reaction or shock due to serum (T80.5-).
More specific shock anaphylactic allergy codes (official index)
- due to
- administration of blood and blood products T80.51 — Anaphylactic reaction due to administration of blood and blood products
- adverse effect of correct medicinal substance properly administered T88.6 — Anaphylactic reaction due to adverse effect of correct drug or medicament properly administered
- immunization T80.52 — Anaphylactic reaction due to vaccination
- serum NEC T80.59 — Anaphylactic reaction due to other serum
- vaccination T80.52 — Anaphylactic reaction due to vaccination
Don't confuse with (Excludes1 for T78.2)
Common questions about shock anaphylactic allergy ICD-10 codes
What is the ICD-10 code for shock anaphylactic allergy?
- T78.2 — Anaphylactic shock, unspecified (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: T80.51, T88.6, T80.52, T80.59 and others below.
Is T78.2 billable?
- No. T78.2 is a header code. Report one of its more specific subcodes instead.