T78.081D — Anaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter
T78.081D is a billable, specific ICD-10-CM code for anaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter. It is valid for submission on a claim.
7th character "D" — subsequent encounter
The appropriate 7th character is to be added to each code from category T78
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- Anaphylactic reaction due to egg with tolerance to baked egg (T78.080)
Excludes1 inherited from the categories above T78.081D
These are not written on T78.081D, but they bind it: a note on a category applies to every code beneath it. Billing T78.081D with anything listed here is a denial.
Excludes2 inherited from the categories above T78.081D
Also inherited, and the opposite of Excludes1: these conditions are not part of T78.081D, but a patient can have both, so you may code both.
Other codes that can never be billed with T78.081D
These codes carry an Excludes1 note pointing at T78.081D. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading T78.081D alone.
- T75Other and unspecified effects of other external causes
Risk adjustment
T78.081D does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
T78.081D is named in 39 Medicare coverage policies — 39 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56558Billing and Coding: Allergy Testing
- A56558Billing and Coding: Allergy Testing
- A56558Billing and Coding: Allergy Testing
- A56559Billing and Coding: Allergy Skin Testing
Code history
What changed, and when. Derived by diffing consecutive CMS release files — which matters when you are defending a code assigned under an earlier edition.
- addedFY2024-FY2026
Anaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter
Related codes at this level
Codes that share T78.081. If T78.081D is not quite right, the correct code is usually one of these.
Questions about T78.081D
- Is T78.081D a billable ICD-10-CM code?
- Yes. T78.081D is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T78.081D sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Other and unspecified effects of external causes (T66-T78).
- What cannot be coded together with T78.081D?
- T78.081D carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T78.081D (T78.081) and apply to it just the same.