T78.080S — Anaphylactic reaction due to egg with tolerance to baked egg, sequela
T78.080S is a billable, specific ICD-10-CM code for anaphylactic reaction due to egg with tolerance to baked egg, sequela. It is valid for submission on a claim.
7th character "S" — sequela
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 reactivity to baked egg (T78.081)
Risk adjustment
T78.080S 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
T78.080S is named in 29 Medicare coverage policies — 29 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
Related codes at this level
Codes that share T78.080. If T78.080S is not quite right, the correct code is usually one of these.
Questions about T78.080S
- Is T78.080S a billable ICD-10-CM code?
- Yes. T78.080S is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T78.080S 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 T78.080S?
- T78.080S carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.