NPPES file of Aug 9, 2026

Donald Mills Matheson, M.D.

Family Medicine Physician · Willits, CA

Donald Mills Matheson, M.D. is a family medicine physician with a practice address in Willits, California, and NPI 1629060900, issued on Aug 22, 2005. Check the license (California G25745, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1629060900
Name
Donald Mills Matheson
Credential
M.D.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
G25745 CA
Self-reported in NPPES; status is on the state search
Practice location
1245 S Main St, Willits, CA 95490
Phone
(707) 459-6861
Enumerated
Aug 22, 2005
Record last updated
Jul 13, 2026
Fax
(707) 459-3057
Medicare enrollment
Enrolled (PECOS I20110107000304); accepts Medicare assignment
Medical or professional school
Stanford University School Of Medicine, 1972
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
Download card Updates feed

8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →

Also registered at 1245 S Main St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Miriam Harris, M.D.Family Medicine Physician1033476452
  2. Jordan Kruse, RN, FNPPrimary Care Nurse Practitioner1154204378
  3. Monte Lieberfarb, M.D.Family Medicine Physician1922078898
  4. Angus Matheson, M.D.Family Medicine Physician1053381939
  5. Lisa McCurley, ARNPFamily Nurse Practitioner1326391624
  6. Glenn Rogers, M.D.Internal Medicine Physician1821091133

Verify Donald Mills Matheson in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G25745    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

Bills Medicare through one group practice

  1. John R Glyer D Mills Matheson And Margaret Arner Mds PtrWillits, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Donald Mills Matheson among 17,133 family medicine physician records in California

Donald Mills Matheson, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 94% newer
  • In a Medicare fileYes · 81% of these records are
  • In the CMS Doctors and Clinicians fileYes · 62% of these records are
  • Graduated1972 · median 2005 among the 10,652 with a school on file
  • Record last updated2026 · 58% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

7 family medicine physician records list a practice address in Willits

They are 7 of the 162 NPPES records with a practice address in Willits, and 17,133 family medicine physician records in California.

All 17,133 in California → Every provider in Willits → Family Medicine Physician nationwide →

The 8 family medicine physician records with the nearest ZIP codes

  1. Margaret Arner, M.D.Willits, CA 954901063482891
  2. John Glyer, M.D,Willits, CA 954901801866785
  3. Miriam Harris, M.D.Willits, CA 954901033476452
  4. Monte Lieberfarb, M.D.Willits, CA 954901922078898
  5. Angus Matheson, M.D.Willits, CA 954901053381939
  6. Elizabeth Whipkey-Olson, D.O.Willits, CA 954901306870605
  7. Jamila Benn, MDWindsor, CA 954921477564946
  8. Elizabeth Flower, M.D.Windsor, CA 954921538173141

Common questions

What is Donald Mills Matheson, M.D.'s NPI number?

Donald Mills Matheson, M.D.'s National Provider Identifier (NPI) is 1629060900, issued on Aug 22, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Donald Mills Matheson, M.D. located?

The NPPES record lists a practice address at 1245 S Main St, Willits, CA, 95490. Phone: (707) 459-6861. Providers update this record themselves, so call before visiting.

How can I verify Donald Mills Matheson, M.D.'s license?

NPPES lists California license number G25745, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.