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

John P Williams, DO

Individual provider Internal Medicine Physician · NPI 1144220369

John P Williams, DO is an Internal Medicine in Willits, California. Graduated from University of New England, College of Osteo Medicine in 1989, 37 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in California.

Years since qualifying
37
Trained at
University of New England, College of Osteo Medicine
Licensed in
CA
In the registry since
2005
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.

See every abbreviation used in this directory →

Practice location Address checks out

1712 S Main St Ste C
Willits, CA 95490-4400
Phone: (707) 459-5585
Fax: (707) 459-3548
Show map & directions

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 20A6027 (CA)

Record details

NPI number1144220369
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedJuly 29, 2005
Last updated in NPPESDecember 19, 2018
Mailing address1712 S Main St, Ste C, Willits, CA 95490-4400

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesOSTEOPATHIC MANIPULATIVE MEDICINE
Medical schoolUNIVERSITY OF NEW ENGLAND, COLLEGE OF OSTEO MEDICINE
Graduated 1989 (37 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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