ICD-10-CM 2027 diagnosis code

T42.76Underdosing of unspecified antiepileptic and sedative-hypnotic drugs

Not billable — use a more specific codeRequires 7th character

T42.76 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: Underdosing 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 T42.76

T42.76 is the ICD-10-CM diagnosis code for underdosing 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 T42.76 (Underdosing 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 adverse effect of unspecified antiepileptic and sedative-hypnotic drugs (T42.75).

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

Ainitial encounterT42.76XA
Dsubsequent encounterT42.76XD
SsequelaT42.76XS

Notes that apply from higher levels

Instructions written at a parent level also apply to T42.76.

› From T42 Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs

Excludes2

drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)

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 — Underdosing
Antiepilepsy agent — Underdosing
Central nervous system › depressants — Underdosing
Central nervous system › depressants › hypnotics — Underdosing
Central nervous system › depressants › sedatives; sedative-hypnotics — Underdosing
Depressant › central nervous system (anesthetic) — Underdosing
Hypnotic — Underdosing
Hypnotic › anticonvulsant — Underdosing
Sedative NEC — Underdosing
Sleeping draught, pill — Underdosing
Soporific — Underdosing
Soporific drug — Underdosing

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 T42.76

Is T42.76 billable?: No. T42.76 is a header code. Report one of its more specific subcodes instead.