Is T45.AX4 a billable code?
No. T45.AX4 is a header code that groups 3 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
T45.AX4: Poisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
T45.AX4 groups related diagnoses under poisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under T45.AX4
- T45.AX4APoisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined, initial encounter
- T45.AX4DPoisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined, subsequent encounter
- T45.AX4SPoisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined, sequela
Other codes in T45.AX Poisoning by, adverse effect of and underdosing of immune checkpoint inhibitors and immunostimulant drugs
- T45.AX1Poisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional)header
- T45.AX2Poisoning by immune checkpoint inhibitors and immunostimulant drugs, intentional self-harmheader
- T45.AX3Poisoning by immune checkpoint inhibitors and immunostimulant drugs, assaultheader
- T45.AX5Adverse effect of immune checkpoint inhibitors and immunostimulant drugsheader
- T45.AX6Underdosing of immune checkpoint inhibitors and immunostimulant drugsheader
T45.AX4 questions
What does T45.AX4 mean?
T45.AX4 is the ICD-10-CM code for Poisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined. It is in chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.