T45 — Poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified
T45 is a non-billable header ICD-10-CM code for poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified. 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
These codes carry an Excludes1 note pointing at T45. 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 alone.
- T36Poisoning by, adverse effect of and underdosing of systemic antibiotics
- T37.5Poisoning by, adverse effect of and underdosing of antiviral drugs
- T45.1Poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drugs
- T45.APoisoning by, adverse effect of and underdosing of immune checkpoint inhibitors and immunostimulant drugs
Risk adjustment
T45 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
11 child codes. Green means billable.
- T45.0Poisoning by, adverse effect of and underdosing of antiallergic and antiemetic drugs
- T45.1Poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive 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
- Is T45 a billable ICD-10-CM code?
- No. T45 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does T45 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).