T78.2XXS — Anaphylactic shock, unspecified, sequela
T78.2XXS is a billable, specific ICD-10-CM code for anaphylactic shock, unspecified, 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.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Allergic shock
- Anaphylactic reaction
- Anaphylaxis
Risk adjustment
T78.2XXS 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
T78.2XXS is named in 8 Medicare coverage policies — 8 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56559Billing and Coding: Allergy Skin Testing
- A56559Billing and Coding: Allergy Skin Testing
- A56612Billing and Coding: CT of the Head
- A56730Billing and Coding: Respiratory Therapy and Oximetry Services
Related codes at this level
Codes that share T78.2. If T78.2XXS is not quite right, the correct code is usually one of these.
Questions about T78.2XXS
- Is T78.2XXS a billable ICD-10-CM code?
- Yes. T78.2XXS is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T78.2XXS 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 T78.2XXS?
- T78.2XXS carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.