T50.99 — Poisoning by, adverse effect of and underdosing of other drugs, medicaments and biological substances
Is T50.99 billable?
No — T50.99 is a non-billable header code. T50.99 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 T50.99.
Billable codes under this header
- T50.991APoisoning by other drugs, medicaments and biological substances, accidental (unintentional), initial encounter
- T50.991DPoisoning by other drugs, medicaments and biological substances, accidental (unintentional), subsequent encounter
- T50.991SPoisoning by other drugs, medicaments and biological substances, accidental (unintentional), sequela
- T50.992APoisoning by other drugs, medicaments and biological substances, intentional self-harm, initial encounter
- T50.992DPoisoning by other drugs, medicaments and biological substances, intentional self-harm, subsequent encounter
- T50.992SPoisoning by other drugs, medicaments and biological substances, intentional self-harm, sequela
- T50.993APoisoning by other drugs, medicaments and biological substances, assault, initial encounter
- T50.993DPoisoning by other drugs, medicaments and biological substances, assault, subsequent encounter
- T50.993SPoisoning by other drugs, medicaments and biological substances, assault, sequela
- T50.994APoisoning by other drugs, medicaments and biological substances, undetermined, initial encounter
- T50.994DPoisoning by other drugs, medicaments and biological substances, undetermined, subsequent encounter
- T50.994SPoisoning by other drugs, medicaments and biological substances, undetermined, sequela
- T50.995AAdverse effect of other drugs, medicaments and biological substances, initial encounter
- T50.995DAdverse effect of other drugs, medicaments and biological substances, subsequent encounter
- T50.995SAdverse effect of other drugs, medicaments and biological substances, sequela
- T50.996AUnderdosing of other drugs, medicaments and biological substances, initial encounter
- T50.996DUnderdosing of other drugs, medicaments and biological substances, subsequent encounter
- T50.996SUnderdosing of other drugs, medicaments and biological substances, sequela
T50.99 at a glance
| Code | T50.99 |
|---|---|
| Description | Poisoning by, adverse effect of and underdosing of other drugs, medicaments and biological substances |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together — inherited from T36-T50
The conditions below can never be reported together with T50.99 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 T50.99. T50.99 describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T50.99 to fully describe the condition. T50.99 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 T50.99 to fully describe the condition. T50.99 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T50.99, but a patient may have both at the same time. When documentation supports it, T50.99 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T50.99, but a patient may have both at the same time. When documentation supports it, T50.99 and the excluded code may both be reported.
What codes fall under T50.99? (6)
- T50.991Poisoning by other drugs, medicaments and biological substances, accidental (unintentional)not billable
- T50.992Poisoning by other drugs, medicaments and biological substances, intentional self-harmnot billable
- T50.993Poisoning by other drugs, medicaments and biological substances, assaultnot billable
- T50.994Poisoning by other drugs, medicaments and biological substances, undeterminednot billable
- T50.995Adverse effect of other drugs, medicaments and biological substancesnot billable
- T50.996Underdosing of other drugs, medicaments and biological substancesnot billable
How long has T50.99 existed?
T50.99 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.