Is T37 a billable ICD-10-CM code?

No. T37 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does T37 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).

What cannot be coded together with T37?

T37 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

T37

T37 — Poisoning by, adverse effect of and underdosing of other systemic anti-infectives and antiparasitics

Non-billable headerICD-10-CM

T37 is a non-billable header ICD-10-CM code for poisoning by, adverse effect of and underdosing of other systemic anti-infectives and antiparasitics. 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 T37

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.

anti-infectives topically used for ear, nose and throat (T49.6-)
anti-infectives topically used for eye (T49.5-)
locally applied anti-infectives NEC (T49.0-)

Other codes that can never be billed with T37

These codes carry an Excludes1 note pointing at T37. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading T37 alone.

T37.2Poisoning by, adverse effect of and underdosing of antimalarials and drugs acting on other blood protozoa
T37.8Poisoning by, adverse effect of and underdosing of other specified systemic anti-infectives and antiparasitics

Risk adjustment

T37 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 T37

8 child codes. Green means billable.

Questions about T37

Is T37 a billable ICD-10-CM code?: No. T37 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does T37 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).
What cannot be coded together with T37?: T37 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.