T65.9
Toxic effect of unspecified substance
Not billable — category only FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 8 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
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 8 same parent — T65
T65.0 Toxic effect of cyanides category T65.1 Toxic effect of strychnine and its salts category T65.2 Toxic effect of tobacco and nicotine category T65.3 Toxic effect of nitrodrv/aminodrv of benzn/homolog category T65.4 Toxic effect of carbon disulfide category T65.5 Toxic effect of nitro and oth nitric acids and esters category T65.6 Toxic effect of paints and dyes, not elsewhere classified category T65.8 Toxic effect of other specified substances category
Subordinate codes 4
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.