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

Andrew Ryan Lai, MD

Individual provider Internal Medicine Physician · NPI 1861666281

Andrew Ryan Lai, MD practises Internal Medicine in San Francisco, California. Graduated from Warren Alpert Medical School of Brown University in 2006, 20 years ago. Practices with Regents of the University of California, a 717-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
20
Trained at
Warren Alpert Medical School of Brown University
Licensed in
CA
In the registry since
2008
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

505 Parnassus Ave
San Francisco, CA 94143-2204
Phone: (415) 476-6760
Fax: (415) 502-1963
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence A103036 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence A103036 (CA)

Record details

NPI number1861666281
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedApril 16, 2008
Last updated in NPPESJanuary 24, 2022
Certification dateJanuary 24, 2022

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolWARREN ALPERT MEDICAL SCHOOL OF BROWN UNIVERSITY
Graduated 2006 (20 years in practice)
Group practice Regents Of The University Of California — 717 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients186
Services billed 765 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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. Those with a page here are linked.

  • Ucsf Medical Center Hospital · San Francisco, CA
  • Ucsf Health St. Mary'S Hospital Hospital · San Francisco, CA

Colleagues at Regents of the University of California

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 717 clinicians in the practice; 12 are shown here.

Other providers in San Francisco