304 OHIP code: Mental and behavioural disorders due to psychoactive substance use (e.g, alcohol, opioids, cannabinoids, nicotine, cocaine, hallucinogens, sedative/hypnotics…
304 is the OHIP diagnostic code for “Mental and behavioural disorders due to psychoactive substance use (e.g, alcohol, opioids, cannabinoids, nicotine, cocaine, hallucinogens, sedative/hypnotics, stimulants not including caffeine, etc)” in Ontario Ministry of Health’s March 2026 release, in effect from Mar 13, 2026.
Official description
304Mental and behavioural disorders due to psychoactive substance use (e.g, alcohol, opioids, cannabinoids, nicotine, cocaine, hallucinogens, sedative/hypnotics, stimulants not including caffeine, etc)
OHIP diagnostic codes (ICD-9) · Ontario
Notes for 304
Ontario Ministry of Health’s list gives no includes, excludes or other notes for 304 or the headings above it.
Where 304 sits
- 1SectionMental and Behavioural Disorders
- 2Valid code 304Mental and behavioural disorders due to psychoactive substance use (e.g, alcohol, opioids, cannabinoids, nicotine, cocaine, hallucinogens, sedative/hypnotics, stimulants not including caffeine, etc)
Source and release
- Data release
- OHIP · March 2026
- Effective date
- Mar 13, 2026
- Publisher
- Ontario Ministry of Health
This page is built from the OHIP catalog that Vero Codes reads when it suggests codes: Ontario Ministry of Health’s March 2026 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does OHIP diagnostic code 304 mean?
304 is the OHIP diagnostic code for “Mental and behavioural disorders due to psychoactive substance use (e.g, alcohol, opioids, cannabinoids, nicotine, cocaine, hallucinogens, sedative/hypnotics, stimulants not including caffeine, etc)” in Ontario Ministry of Health’s OHIP March 2026 release.
Where is 304 in the OHIP list?
304 is listed under Mental and Behavioural Disorders.
What coding notes apply to 304?
Ontario Ministry of Health’s list gives no includes, excludes or other notes for 304 or the headings above it.
Which OHIP release does this page use?
It uses Ontario Ministry of Health’s March 2026 release, in effect from Mar 13, 2026. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.