T48.99
Poisoning by, adverse effect of and underdosing of other agents primarily acting on the respiratory system
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 — T48.9
Subordinate codes 6
T48.991 Poisn by oth agents primarily acting on the resp sys, acc T48.992 Poisn by oth agents prim acting on the resp sys, self-harm T48.993 Poisn by oth agents prim acting on the resp sys, assault T48.994 Poisn by oth agents primarily acting on the resp sys, undet T48.995 Adverse effect of agents primarily acting on the resp sys T48.996 Underdosing of agents primarily acting on the resp sys
Medications 5
102 Signs and Symptoms, Respiratory drugs 1 Mercury Poisoning, Nervous System drugs 1 Lead Poisoning, Nervous System drugs 16 Heavy Metal Poisoning, Nervous System drugs 1 Lead Poisoning, Nervous System, Childhood drugs
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.