T50.Z9
Poisoning by, adverse effect of and underdosing of other vaccines and biological substances
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 2 never code together
7th character 3
A initial encounter
D subsequent encounter
S sequela
Instructional notes 3
S00-T88chapter
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.
Use additional code
- code to identify any retained foreign body, if applicable (Z18.-)Z18.-
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 1 same parent — T50.Z
Subordinate codes 6
T50.Z91 Poisoning by oth vaccines and biological substances, acc T50.Z92 Poisoning by oth vaccines and biolg substances, self-harm T50.Z93 Poisoning by oth vaccines and biological substances, assault T50.Z94 Poisoning by oth vaccines and biological substances, undet T50.Z95 Adverse effect of other vaccines and biological substances T50.Z96 Underdosing of other vaccines and biological substances
Medications 1
MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.