T50.A11S — Poisoning by pertussis vaccine, including combinations with a pertussis component, accidental (unintentional), sequela
Is T50.A11S billable?
Yes — T50.A11S is billable for FY2027. T50.A11S is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T50.A11S may be submitted for encounters from October 1, 2026 through September 30, 2027.
T50.A11S at a glance
| Code | T50.A11S |
|---|---|
| Description | Poisoning by pertussis vaccine, including combinations with a pertussis component, accidental (unintentional), sequela |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "S" | sequela |
What does the 7th character "S" mean in T50.A11S?
In T50.A11S, the 7th character S means sequela. The 7th character is required for T50.A11S to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T50.A11S group to?
T50.A11S sits in MDC 21 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 922Other Injury, Poisoning and Toxic Effect Diagnoses with MCCmedical
- 923Other Injury, Poisoning and Toxic Effect Diagnoses without MCCmedical
Excludes1 — never code together — inherited from T36-T50
The conditions below can never be reported together with T50.A11S 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.A11S. T50.A11S 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.A11S to fully describe the condition. T50.A11S 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.A11S to fully describe the condition. T50.A11S is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T50.A11S, but a patient may have both at the same time. When documentation supports it, T50.A11S and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T50.A11S, but a patient may have both at the same time. When documentation supports it, T50.A11S and the excluded code may both be reported.
How long has T50.A11S existed?
T50.A11S 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.