Mental health services are a type of specialized care given during inpatient, outpatient, and partial hospitalization for psychiatric treatment.

Outpatient services can include care from psychiatrists or other doctors, clinical psychologists, clinical social workers, clinical nurse specialists, nurse practitioners, and physician assistants.

References

https://www.medicare.gov/what-medicare-covers/what-part-b-covers
https://www.medicare.gov/coverage/mental-health-care-outpatient