ICD-10-CM 2027 diagnosis code
T42.75Adverse effect of unspecified antiepileptic and sedative-hypnotic drugs
T42.75 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.Short description: Adverse effect of unsp antiepileptic and sed-hypntc drugs
Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data
About T42.75
T42.75 is the ICD-10-CM diagnosis code for adverse effect of unspecified antiepileptic and sedative-hypnotic drugs. It belongs to category T42 (poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs), block T36-T50 (poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
Within T42.7, choose T42.75 (Adverse effect of unspecified antiepileptic and sedative-hypnotic drugs) only when documentation doesn't support a more specific option: poisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional) (T42.71), poisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm (T42.72), poisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault (T42.73), poisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined (T42.74) and underdosing of unspecified antiepileptic and sedative-hypnotic drugs (T42.76).
Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
7th character
The appropriate 7th character is to be added to each code from category T42
Notes that apply from higher levels
Instructions written at a parent level also apply to T42.75.
Broader instructions also apply from T36-T50 Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances and Chapter 19: Injury, poisoning and certain other consequences of external causes.
Table of Drugs & Neoplasms entries
- Anticonvulsant — Adverse effect
- Antiepilepsy agent — Adverse effect
- Central nervous system › depressants — Adverse effect
- Central nervous system › depressants › hypnotics — Adverse effect
- Central nervous system › depressants › sedatives; sedative-hypnotics — Adverse effect
- Depressant › central nervous system (anesthetic) — Adverse effect
- Hypnotic — Adverse effect
- Hypnotic › anticonvulsant — Adverse effect
- Sedative NEC — Adverse effect
- Sleeping draught, pill — Adverse effect
- Soporific — Adverse effect
- Soporific drug — Adverse effect
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about T42.75
Is T42.75 billable?
- No. T42.75 is a header code. Report one of its more specific subcodes instead.