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

Miss. Donald Mills Matheson, MD

Individual provider Family Medicine Physician · NPI 1629060900

Miss. Donald Mills Matheson, MD is registered under Family Practice in Willits, California. Graduated from Stanford University School of Medicine in 1972, 54 years ago. Practices with John R Glyer D Mills Matheson and Margaret Arner Mds Ptr, a 6-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
54
Trained at
Stanford University School of Medicine
Licensed in
CA
In the registry since
2005
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

1245 S Main St
Willits, CA 95490-4305
Phone: (707) 459-6861
Fax: (707) 459-3057
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence G25745 (CA)

Record details

NPI number1629060900
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 22, 2005
Last updated in NPPESJuly 13, 2026

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolSTANFORD UNIVERSITY SCHOOL OF MEDICINE
Graduated 1972 (54 years in practice)
Group practice John R Glyer D Mills Matheson And Margaret Arner Mds Ptr — 6 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 patients114
Services billed 174 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.

  • Adventist Health Howard Memorial Hospital · Willits, CA

Colleagues at John R Glyer D Mills Matheson and Margaret Arner Mds Ptr

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Willits