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T78.081A vs T78.081D

T78.081A (Anaphylactic reaction due to egg with reactivity to baked egg, initial encounter) compared with T78.081D (Anaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter), from the official CMS tabular data. T78.081A and T78.081D code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

T78.081A
Initial encounter
Anaphylactic reaction due to egg with reactivity to baked egg, initial encounter
↔
T78.081D
Subsequent encounter
Anaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter

Same underlying diagnosis, different encounter phase.

The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.

Source: ICD-10-CM Official Guidelines, Section I.C.19.a

Can these codes be reported together?

Same injury, other encounter phase. T78.081A and T78.081D code the same injury at a different phase of treatment, set by the 7th character.

The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.

Side by side

T78.081AAnaphylactic reaction due to egg with reactivity to baked egg, initial encounterT78.081DAnaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter
Billing statusBillableBillable
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionAnaphylactic reaction due to egg with reactivity to baked egg, initial encounter is a billable ICD-10-CM diagnosis code (T78.081A).Anaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter is a billable ICD-10-CM diagnosis code (T78.081D).
7th characterThe appropriate 7th character is to be added to each code from category T78The appropriate 7th character is to be added to each code from category T78
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources