Is T50.Z91 a billable ICD-10-CM code?

No. T50.Z91 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T50.Z91 sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50).

T50.Z91

T50.Z91 — Poisoning by other vaccines and biological substances, accidental (unintentional)

Non-billable headerICD-10-CM

T50.Z91 is a non-billable header ICD-10-CM code for poisoning by other vaccines and biological substances, accidental (unintentional). 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 T50

A: initial encounter
D: subsequent encounter
S: sequela

Risk adjustment

T50.Z91 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 to one of these instead T50.Z91

3 child codes. Green means billable.

Related codes at this level

Codes that share T50.Z9. If T50.Z91 is not quite right, the correct code is usually one of these.

Questions about T50.Z91

Is T50.Z91 a billable ICD-10-CM code?: No. T50.Z91 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T50.Z91 sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50).