T45.AX1D — Poisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional), subsequent encounter
T45.AX1D is a billable, specific ICD-10-CM code for poisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional), subsequent encounter. It is valid for submission on a claim.
7th character "D" — subsequent 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 immune checkpoint inhibitors and immunosuppressive drugs NOS
Risk adjustment
T45.AX1D 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.AX1D is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56948Billing and Coding: Lab: Cystatin C Measurement
- A57473Billing and Coding: Allergy Testing
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- A57657Billing and Coding: Sedimentation Rate, Erythrocyte
Code history
What changed, and when. Derived by diffing consecutive CMS release files — which matters when you are defending a code assigned under an earlier edition.
- addedFY2024-FY2026
Poisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional), subsequent encounter
Related codes at this level
Codes that share T45.AX1. If T45.AX1D is not quite right, the correct code is usually one of these.
Questions about T45.AX1D
- Is T45.AX1D a billable ICD-10-CM code?
- Yes. T45.AX1D is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T45.AX1D 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).