Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Forrest Robert Hamlin Sr., DO

Individual provider Internal Medicine Physician · NPI 1225558349

Forrest Robert Hamlin Sr., DO is a Hospitalist in San Jose, California. Graduated from Michigan State University College of Osteopathic Medicine in 2017, 9 years ago. Practices with Billings Clinic, a 805-clinician group and accepts Medicare assignment. Licensed in California, Idaho and Montana.

Years since qualifying
9
Trained at
Michigan State University College of Osteopathic Medicine
Licensed in
CA, ID, MT
In the registry since
2017
Specialties on file
5
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

415 E Taylor St
San Jose, CA 95112
Phone: (530) 224-9144
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence MED-PHYS-LIC-162063 (MT)
Internal Medicine Physician Taxonomy 207R00000X · Licence MED-PHYS-LIC-162063 (MT)
General Practice Physician Taxonomy 208D00000X · Licence 17023 (CA)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X
Family Medicine Physician Taxonomy 207Q00000X · Licence O-1860 (ID)

Record details

NPI number1225558349
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedJune 20, 2017
Last updated in NPPESSeptember 30, 2025
Certification dateSeptember 30, 2025

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Medical schoolMICHIGAN STATE UNIVERSITY COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 2017 (9 years in practice)
Group practice Billings Clinic — 805 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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 patients273
Services billed 737 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 Billings Clinic

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 805 clinicians in the practice; 12 are shown here.

Other providers in San Jose