T45.1 — Poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drugs
Is T45.1 billable?
No — T45.1 is a non-billable header code. T45.1 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 T45.1.
Billable codes under this header
- T45.1X1APoisoning by antineoplastic and immunosuppressive drugs, accidental (unintentional), initial encounter
- T45.1X1DPoisoning by antineoplastic and immunosuppressive drugs, accidental (unintentional), subsequent encounter
- T45.1X1SPoisoning by antineoplastic and immunosuppressive drugs, accidental (unintentional), sequela
- T45.1X2APoisoning by antineoplastic and immunosuppressive drugs, intentional self-harm, initial encounter
- T45.1X2DPoisoning by antineoplastic and immunosuppressive drugs, intentional self-harm, subsequent encounter
- T45.1X2SPoisoning by antineoplastic and immunosuppressive drugs, intentional self-harm, sequela
- T45.1X3APoisoning by antineoplastic and immunosuppressive drugs, assault, initial encounter
- T45.1X3DPoisoning by antineoplastic and immunosuppressive drugs, assault, subsequent encounter
- T45.1X3SPoisoning by antineoplastic and immunosuppressive drugs, assault, sequela
- T45.1X4APoisoning by antineoplastic and immunosuppressive drugs, undetermined, initial encounter
- T45.1X4DPoisoning by antineoplastic and immunosuppressive drugs, undetermined, subsequent encounter
- T45.1X4SPoisoning by antineoplastic and immunosuppressive drugs, undetermined, sequela
- T45.1X5AAdverse effect of antineoplastic and immunosuppressive drugs, initial encounter
- T45.1X5DAdverse effect of antineoplastic and immunosuppressive drugs, subsequent encounter
- T45.1X5SAdverse effect of antineoplastic and immunosuppressive drugs, sequela
- T45.1X6AUnderdosing of antineoplastic and immunosuppressive drugs, initial encounter
- T45.1X6DUnderdosing of antineoplastic and immunosuppressive drugs, subsequent encounter
- T45.1X6SUnderdosing of antineoplastic and immunosuppressive drugs, sequela
T45.1 at a glance
| Code | T45.1 |
|---|---|
| Description | Poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive 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 T45.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes1 — never code together — inherited from T36-T50
The conditions below can never be reported together with T45.1 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 T45.1. T45.1 describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T45.1 to fully describe the condition. T45.1 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 T45.1 to fully describe the condition. T45.1 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T45.1, but a patient may have both at the same time. When documentation supports it, T45.1 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T45.1, but a patient may have both at the same time. When documentation supports it, T45.1 and the excluded code may both be reported.
What codes fall under T45.1? (1)
How long has T45.1 existed?
T45.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
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
- T45.2Poisoning 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
- T45.APoisoning by, adverse effect of and underdosing of immune checkpoint inhibitors and immunostimulant drugsnot billable