Quick answers
- Does Donald M. Matheson accept Medicare assignment?
- Yes. Medicare's clinician data says Donald M. Matheson accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Donald M. Matheson see?
- In 2024, CMS data shows 114 Original Medicare patients and 174 services for Donald M. Matheson. This counts Original Medicare only and measures volume, not quality.
- What is Donald M. Matheson's NPI number?
- 1629060900. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Donald M. Matheson, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 114 |
|---|---|
| Services billed to Medicare | 174 |
| Different services or procedures | 14 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Hemoglobin a1c level (83036)85 services
- Heart rhythm review and interpretation of continous external ekg over 8-15 days (93248)46 services
- Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus (87426)14 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol72%
- Arthritis46%
- Diabetes45%
- Anxiety32%
- Atrial fibrillation21%
Hospitals where Donald M. Matheson works
Medicare's Facility Affiliation Data lists Donald M. Matheson at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Adventist Health Howard MemorialWillits, CA · Critical Access Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 051310
Practice locations
Addresses where Donald M. Matheson is enrolled with Medicare (CMS data updated October 2, 2026).
- 1245 S Main StWillits, CA 95490 (707) 459‑6861
Group practices
Medicare enrollment lists Donald M. Matheson as a member of this group (CMS data updated October 2, 2026).
- John R Glyer D Mills Matheson and Margaret Arner MDS PTR6 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Willits
Clinicians with the same Medicare primary specialty in Willits, CA — not a recommendation.
Other clinicians in John R Glyer D Mills Matheson and Margaret Arner MDS PTR
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Stanford University School Of Medicine |
| Graduation year | 1972 (54 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1629060900 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians