T78.080A — Anaphylactic reaction due to egg with tolerance to baked egg, initial encounter
Is T78.080A billable?
Yes — T78.080A is billable for FY2027. T78.080A is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T78.080A may be submitted for encounters from October 1, 2026 through September 30, 2027.
T78.080A at a glance
| Code | T78.080A |
|---|---|
| Description | Anaphylactic reaction due to egg with tolerance to baked egg, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in T78.080A?
In T78.080A, the 7th character A means initial encounter. The 7th character is required for T78.080A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T78.080A group to?
T78.080A sits in MDC 21 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 915Allergic Reactions with MCCmedical
- 916Allergic Reactions without MCCmedical
As a secondary diagnosis, T78.080A is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is T78.080A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T78.080, the nearest indexed parent of T78.080A. Use them to find the family, then select the specific code.
- Allergy, allergic › eggs › anaphylactic reaction › with › tolerance to baked egg (reaction) (to)
- Shock › anaphylactic › due to food › eggs › with › tolerance to baked egg
Excludes1 — never code together
The conditions below can never be reported together with T78.080A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- Anaphylactic reaction due to egg with reactivity to baked egg (T78.081)
Excludes1 — never code together — inherited from T78.080
The conditions below can never be reported together with T78.080A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- Anaphylactic reaction due to egg with reactivity to baked egg (T78.081)
Use additional code — inherited from Chapter 19
Report an additional code alongside T78.080A to fully describe the condition. T78.080A is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T78.080A, but a patient may have both at the same time. When documentation supports it, T78.080A and the excluded code may both be reported.
Excludes2 — not included here — inherited from T78
The conditions below are not part of T78.080A, but a patient may have both at the same time. When documentation supports it, T78.080A and the excluded code may both be reported.
- complications of surgical and medical care NEC (T80-T88)
Code also — inherited from T66-T78
Two codes may be needed to describe the condition fully. Whether T78.080A is sequenced first depends on the reason for the encounter.
- , if applicable, place of occurrence, such as:
- highway rest stop (Y92.523)
- school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
- service areas as the place of occurrence of the external cause (Y92.52-)
- single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
- transport vehicle as the place of occurrence of the external cause (Y92.81-)
How long has T78.080A existed?
T78.080A first appears in FY2026.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.