T78.2XXA — Anaphylactic shock, unspecified, initial encounter
T78.2XXA is a billable, specific ICD-10-CM code for anaphylactic shock, unspecified, initial encounter. It is valid for submission on a claim.
7th character "A" — initial 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.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Allergic shock
- Anaphylactic reaction
- Anaphylaxis
Risk adjustment
T78.2XXA 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
T78.2XXA 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.
- A56612Billing and Coding: CT of the Head
- A56730Billing and Coding: Respiratory Therapy and Oximetry Services
- A56844Billing and Coding: RAST Type Tests
- A57043Billing and Coding: RAST Type Tests
Related codes at this level
Codes that share T78.2. If T78.2XXA is not quite right, the correct code is usually one of these.
Questions about T78.2XXA
- Is T78.2XXA a billable ICD-10-CM code?
- Yes. T78.2XXA is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T78.2XXA 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 T78.2XXA?
- T78.2XXA carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.