Is T45.0X1A a billable ICD-10-CM code?

Yes. T45.0X1A is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does T45.0X1A 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 T45.0X1A?

T45.0X1A carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T45.0X1A (T45.0) and apply to it just the same.

T45.0X1A

T45.0X1A — Poisoning by antiallergic and antiemetic drugs, accidental (unintentional), initial encounter

Billable / specific codeICD-10-CM

T45.0X1A is a billable, specific ICD-10-CM code for poisoning by antiallergic and antiemetic drugs, accidental (unintentional), 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 T45

A: initial encounter
D: subsequent encounter
S: sequela

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Poisoning by antiallergic and antiemetic drugs NOS

Excludes1 inherited from the categories above T45.0X1A

These are not written on T45.0X1A, but they bind it: a note on a category applies to every code beneath it. Billing T45.0X1A with anything listed here is a denial.

Written on T45.0 — Poisoning by, adverse effect of and underdosing of antiallergic and antiemetic drugs

poisoning by, adverse effect of and underdosing of phenothiazine-based neuroleptics (T43.3)

Risk adjustment

T45.0X1A 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

T45.0X1A is named in 11 Medicare coverage policies — 11 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A54799Billing and Coding: Urine Drug Testing
A55001Billing and Coding: Urine Drug Testing
A56612Billing and Coding: CT of the Head
A56645Billing and Coding: Controlled Substance Monitoring and Drugs of Abuse Testing

Code history

T45.0X1A has not changed since FY2024 — no addition, revision or deletion across the FY2024–FY2027 ICD-10-CM releases.

Related codes at this level

Codes that share T45.0X1. If T45.0X1A is not quite right, the correct code is usually one of these.

Questions about T45.0X1A

Is T45.0X1A a billable ICD-10-CM code?: Yes. T45.0X1A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T45.0X1A 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 T45.0X1A?: T45.0X1A carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above T45.0X1A (T45.0) and apply to it just the same.