T50.905A
Adverse effect of unspecified drugs, medicaments and biological substances, initial encounter
Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 2 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 2 never code together
7th character 3
A initial encounter this code
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 1 filed at T50.905
The index files this at T50.905. The tabular
extends it — laterality, staging, or the 7th character — so these entries
lead to the family rather than to T50.905A exactly.
- Adverse effect — see Table of Drugs and Chemicals, categories T36-T50, with 6th character 5
Alongside this code 2 same parent — T50.905
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.