T42
ICD-10Non-billable categoryAntiepileptic, sedative- hypnotic and antiparkinsonism drugs
Official ICD-10-CM descriptor (FY2026)
Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
T42 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)
7th character
- The appropriate 7th character is to be added to each code from category T42
Permitted 7th characters
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
More specific codes under T42
- T42.0Hydantoin derivativescategory
- T42.1Iminostilbenescategory
- T42.2Succinimides and oxazolidinedionescategory
- T42.3Barbituratescategory
- T42.4Benzodiazepinescategory
- T42.5Mixed antiepilepticscategory
- T42.6Antiepileptic and sedative-hypnotic drugscategory
- T42.7Unsp antiepileptic and sedative-hypnotic drugscategory
- T42.8Antiparkns drug/centr muscle-tone depressantscategory
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.