T45.1 — Poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drugs
T45.1 is a non-billable header ICD-10-CM code for poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drugs. 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 T45
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Other codes that can never be billed with T45.1
These codes carry an Excludes1 note pointing at T45.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading T45.1 alone.
Risk adjustment
T45.1 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 T45.1
1 child code. Green means billable.
Related codes at this level
Codes that share T45. If T45.1 is not quite right, the correct code is usually one of these.
- T45.0Poisoning by, adverse effect of and underdosing of antiallergic and antiemetic drugs
- T45.2Poisoning by, adverse effect of and underdosing of vitamins
- T45.3Poisoning by, adverse effect of and underdosing of enzymes
- T45.4Poisoning by, adverse effect of and underdosing of iron and its compounds
- T45.5Poisoning by, adverse effect of and underdosing of anticoagulants and antithrombotic drugs
- T45.6Poisoning by, adverse effect of and underdosing of fibrinolysis-affecting drugs
- T45.7Poisoning by, adverse effect of and underdosing of anticoagulant antagonists, vitamin K and other coagulants
- T45.8Poisoning by, adverse effect of and underdosing of other primarily systemic and hematological agents
- T45.9Poisoning by, adverse effect of and underdosing of unspecified primarily systemic and hematological agent
- T45.APoisoning by, adverse effect of and underdosing of immune checkpoint inhibitors and immunostimulant drugs
Questions about T45.1
- Is T45.1 a billable ICD-10-CM code?
- No. T45.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does T45.1 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 T45.1?
- T45.1 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.