Is T78.08 a billable ICD-10-CM code?

No. T78.08 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T78.08 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).

T78.08

T78.08 — Anaphylactic reaction due to eggs

Non-billable headerICD-10-CM

T78.08 is a non-billable header ICD-10-CM code for anaphylactic reaction due to eggs. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

The appropriate 7th character is to be added to each code from category T78

A: initial encounter
D: subsequent encounter
S: sequela

Excludes2 inherited from the categories above T78.08

Also inherited, and the opposite of Excludes1: these conditions are not part of T78.08, but a patient can have both, so you may code both.

Written on T78 — Adverse effects, not elsewhere classified

complications of surgical and medical care NEC (T80-T88)

Other codes that can never be billed with T78.08

These codes carry an Excludes1 note pointing at T78.08. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading T78.08 alone.

T78.080Anaphylactic reaction due to egg with tolerance to baked egg
T78.080AAnaphylactic reaction due to egg with tolerance to baked egg, initial encounter
T78.080DAnaphylactic reaction due to egg with tolerance to baked egg, subsequent encounter
T78.080SAnaphylactic reaction due to egg with tolerance to baked egg, sequela
T78.081Anaphylactic reaction due to egg with reactivity to baked egg
T78.081AAnaphylactic reaction due to egg with reactivity to baked egg, initial encounter
T78.081DAnaphylactic reaction due to egg with reactivity to baked egg, subsequent encounter
T78.081SAnaphylactic reaction due to egg with reactivity to baked egg, sequela

Risk adjustment

T78.08 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.

Code history

T78.08 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead T78.08

3 child codes. Green means billable.

Related codes at this level

Codes that share T78.0. If T78.08 is not quite right, the correct code is usually one of these.

Questions about T78.08

Is T78.08 a billable ICD-10-CM code?: No. T78.08 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T78.08 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).