Is T45.1X5D a billable ICD-10-CM code?

Yes. T45.1X5D is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does T45.1X5D 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 T45.1X5D?

T45.1X5D 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 T45.1X5D (T45.1) and apply to it just the same.

T45.1X5D

T45.1X5D — Adverse effect of antineoplastic and immunosuppressive drugs, subsequent encounter

Billable / specific codeICD-10-CMPOA exempt

T45.1X5D is a billable, specific ICD-10-CM code for adverse effect of antineoplastic and immunosuppressive drugs, 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

Excludes1 inherited from the categories above T45.1X5D

These are not written on T45.1X5D, but they bind it: a note on a category applies to every code beneath it. Billing T45.1X5D with anything listed here is a denial.

Written on T45.1 — Poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drugs

poisoning by, adverse effect of and underdosing of immune checkpoint inhibitors and immunostimulant drugs (T45.A)
poisoning by, adverse effect of and underdosing of tamoxifen (T38.6)

Risk adjustment

T45.1X5D 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

T45.1X5D is named in 24 Medicare coverage policies — 24 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52450Billing and Coding: Paclitaxel (e.g., Taxol®/Abraxane ™)
A54768Billing and Coding: Cardiac Blood Pool Imaging (Multiple Gated Acquisition Scanning- MUGA, Ventriculography) When Performed in Conjunction with Cardiotoxic Chemotherapy
A56476Billing and Coding: Cardiac Radionuclide Imaging
A56558Billing and Coding: Allergy Testing

Code history

T45.1X5D 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 T45.1X5. If T45.1X5D is not quite right, the correct code is usually one of these.

Questions about T45.1X5D

Is T45.1X5D a billable ICD-10-CM code?: Yes. T45.1X5D is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does T45.1X5D 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 T45.1X5D?: T45.1X5D 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 T45.1X5D (T45.1) and apply to it just the same.