Coding and coverage · ICD-10-CM

T50 › T50.A

T50.A2 Poisoning by, adverse effect of and underdosing of mixed bacterial vaccines without a pertussis component

Not billable (header)Chapter 19

This code needs a 7th character (use X as a placeholder for missing characters).

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Codes under this one

  • T50.A21 Poisoning by mixed bacterial vaccines without a pertussis component, accidental (unintentional)Header
  • T50.A22 Poisoning by mixed bacterial vaccines without a pertussis component, intentional self-harmHeader
  • T50.A23 Poisoning by mixed bacterial vaccines without a pertussis component, assaultHeader
  • T50.A24 Poisoning by mixed bacterial vaccines without a pertussis component, undeterminedHeader
  • T50.A25 Adverse effect of mixed bacterial vaccines without a pertussis componentHeader
  • T50.A26 Underdosing of mixed bacterial vaccines without a pertussis componentHeader

Instructional notes

Chapter 19

Excludes2Not included here: the patient may have both; report both when both are present.
Use additional codeAdd a second code for the full picture.
  • code to identify any retained foreign body, if applicable (Z18.-)
Notes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

T50

7th charactersThe appropriate 7th character is to be added to each code from category T50
  • A initial encounter
  • D subsequent encounter
  • S sequela

Chapter 19: Injury, poisoning and certain other consequences of external causes · T07-T88 Injury, poisoning and certain other consequences of external causes (T07-T88)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.