T45.A — Poisoning by, adverse effect of and underdosing of immune checkpoint inhibitors and immunostimulant drugs
Is T45.A billable?
No — T45.A is a non-billable header code. T45.A groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 18 billable codes beneath T45.A.
Billable codes under this header
- T45.AX1APoisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional), initial encounter
- T45.AX1DPoisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional), subsequent encounter
- T45.AX1SPoisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional), sequela
- T45.AX2APoisoning by immune checkpoint inhibitors and immunostimulant drugs, intentional self-harm, initial encounter
- T45.AX2DPoisoning by immune checkpoint inhibitors and immunostimulant drugs, intentional self-harm, subsequent encounter
- T45.AX2SPoisoning by immune checkpoint inhibitors and immunostimulant drugs, intentional self-harm, sequela
- T45.AX3APoisoning by immune checkpoint inhibitors and immunostimulant drugs, assault, initial encounter
- T45.AX3DPoisoning by immune checkpoint inhibitors and immunostimulant drugs, assault, subsequent encounter
- T45.AX3SPoisoning by immune checkpoint inhibitors and immunostimulant drugs, assault, sequela
- 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
- T45.AX5AAdverse effect of immune checkpoint inhibitors and immunostimulant drugs, initial encounter
- T45.AX5DAdverse effect of immune checkpoint inhibitors and immunostimulant drugs, subsequent encounter
- T45.AX5SAdverse effect of immune checkpoint inhibitors and immunostimulant drugs, sequela
- T45.AX6AUnderdosing of immune checkpoint inhibitors and immunostimulant drugs, initial encounter
- T45.AX6DUnderdosing of immune checkpoint inhibitors and immunostimulant drugs, subsequent encounter
- T45.AX6SUnderdosing of immune checkpoint inhibitors and immunostimulant drugs, sequela
T45.A at a glance
| Code | T45.A |
|---|---|
| Description | Poisoning by, adverse effect of and underdosing of immune checkpoint inhibitors and immunostimulant drugs |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together
The conditions below can never be reported together with T45.A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drug (T45.1)
Excludes1 — never code together — inherited from T36-T50
The conditions below can never be reported together with T45.A on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- toxic reaction to local anesthesia in pregnancy (O29.3-)
Code first — inherited from T36-T50
The underlying condition below must be sequenced before T45.A. T45.A describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T45.A to fully describe the condition. T45.A is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T36-T50
Report an additional code alongside T45.A to fully describe the condition. T45.A is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T45.A, but a patient may have both at the same time. When documentation supports it, T45.A and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T45.A, but a patient may have both at the same time. When documentation supports it, T45.A and the excluded code may both be reported.
What codes fall under T45.A? (1)
How long has T45.A existed?
T45.A first appears in FY2025.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
What other codes are in the T45 family? (10)
- T45.0Poisoning by, adverse effect of and underdosing of antiallergic and antiemetic drugsnot billable
- T45.1Poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drugsnot billable
- T45.2Poisoning by, adverse effect of and underdosing of vitaminsnot billable
- T45.3Poisoning by, adverse effect of and underdosing of enzymesnot billable
- T45.4Poisoning by, adverse effect of and underdosing of iron and its compoundsnot billable
- T45.5Poisoning by, adverse effect of and underdosing of anticoagulants and antithrombotic drugsnot billable
- T45.6Poisoning by, adverse effect of and underdosing of fibrinolysis-affecting drugsnot billable
- T45.7Poisoning by, adverse effect of and underdosing of anticoagulant antagonists, vitamin K and other coagulantsnot billable
- T45.8Poisoning by, adverse effect of and underdosing of other primarily systemic and hematological agentsnot billable
- T45.9Poisoning by, adverse effect of and underdosing of unspecified primarily systemic and hematological agentnot billable