Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Mary G. De May, MD

Individual provider Psychiatry Physician · NPI 1134163298

Dr. Mary G. De May, MD practises Psychiatry in San Francisco, California. Graduated from State University of New York at Stony Brook, School of Medicine in 1985, 41 years ago. Practices with UCSF Medical Group Business Services, a 1,531-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
41
Trained at
State University of New York at Stony Brook, School of Medicine
Licensed in
CA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

350 Parnassus Ave Ste 706
San Francisco, CA 94143-0001 Not confirmed with CMS for 13 years — call before visiting
Phone: (415) 476-6880
Fax: (415) 476-4800
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Geriatric Psychiatry Physician (primary) Taxonomy 2084P0805X · Licence G62108 (CA)
Psychiatry Physician Taxonomy 2084P0800X · Licence G62108 (CA)

Record details

NPI number1134163298
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 16, 2006
Last updated in NPPESOctober 19, 2012

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPSYCHIATRY
Medical schoolSTATE UNIVERSITY OF NEW YORK AT STONY BROOK, SCHOOL OF MEDICINE
Graduated 1985 (41 years in practice)
Group practice Ucsf Medical Group Business Services — 1531 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients58
Services billed 211 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at UCSF Medical Group Business Services

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1531 clinicians in the practice; 12 are shown here.

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