HCPCS Level II · Procedures and professional services (temporary)
G0378Hospital observation service, per hour
✓ Active
Source: CMS HCPCS quarterly update, October 2026. Page updated September 29, 2026.
About G0378
G0378 is an HCPCS Level II code in the G series (procedures and professional services (temporary)), describing hospital observation service, per hour.
It was added to HCPCS effective 01/01/2006.
Its Medicare coverage code is "D", meaning special Medicare coverage instructions apply.
Details
- Short description
- Hospital observation per hr
- Date added
- 01/01/2006
- Action effective
- 01/01/2006
- BETOS
- M2A
Related G03xx codes
- G0300Direct skilled nursing services of a licensed practical nurse (lpn) in the home health or hospice setting, each 15 minutes
- G0302Pre-operative pulmonary surgery services for preparation for lvrs, complete course of services, to include a minimum of 16 days of services
- G0303Pre-operative pulmonary surgery services for preparation for lvrs, 10 to 15 days of services
- G0304Pre-operative pulmonary surgery services for preparation for lvrs, 1 to 9 days of services
- G0305Post-discharge pulmonary surgery services after lvrs, minimum of 6 days of services
- G0306Complete cbc, automated (hgb, hct, rbc, wbc, without platelet count) and automated wbc differential count
- G0307Complete (cbc), automated (hgb, hct, rbc, wbc; without platelet count)
- G0310Immunization counseling by a physician or other qualified health care professional when the vaccine(s) is not administered on the same date of service, 5 to 15 mins time (this code is used for medicaid billing purposes)
- G0311Immunization counseling by a physician or other qualified health care professional when the vaccine(s) is not administered on the same date of service, 16-30 mins time (this code is used for medicaid billing purposes)
- G0312Immunization counseling by a physician or other qualified health care professional when the vaccine(s) is not administered on the same date of service for ages under 21, 5 to 15 mins time (this code is used for medicaid billing purposes)
- G0313Immunization counseling by a physician or other qualified health care professional when the vaccine(s) is not administered on the same date of service for ages under 21, 16-30 mins time (this code is used for medicaid billing purposes)
- G0314Immunization counseling by a physician or other qualified health care professional for covid-19, ages under 21, 16-30 mins time (this code is used for the medicaid early and periodic screening, diagnostic, and treatment benefit (epsdt)
Common questions about G0378
Is HCPCS G0378 still valid?
- Yes. G0378 is active in the CMS October 2026 HCPCS file.
Does Medicare cover G0378?
- Its coverage code is "D": special Medicare coverage instructions apply. Check the local coverage determination for your region.