T45.8X5D — Adverse effect of other primarily systemic and hematological agents, subsequent encounter
T45.8X5D is a billable, specific ICD-10-CM code for adverse effect of other primarily systemic and hematological agents, 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
Excludes2 inherited from the categories above T45.8X5D
Also inherited, and the opposite of Excludes1: these conditions are not part of T45.8X5D, but a patient can have both, so you may code both.
Risk adjustment
T45.8X5D 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
T45.8X5D is named in 20 Medicare coverage policies — 20 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56558Billing and Coding: Allergy Testing
- A56612Billing and Coding: CT of the Head
- A56625Billing and Coding: Echocardiography
- A56625Billing and Coding: Echocardiography
Code history
T45.8X5D 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 T45.8X5. If T45.8X5D is not quite right, the correct code is usually one of these.
Questions about T45.8X5D
- Is T45.8X5D a billable ICD-10-CM code?
- Yes. T45.8X5D is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T45.8X5D 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).