Mason Donnell, PHD, PA
NPI 1891417390 · Physician Assistant · San Rafael, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mason Donnell, PHD, PA is a Physician Assistant provider in San Rafael, CA (NPI 1891417390).
Provider details
- NPI number
- 1891417390
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PHD, PA
- Sex
- Male
- Sole proprietor
- Yes
- License
- 62685 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 73 | 34 |
| Gabapentin | 57 | 24 |
| Losartan Potassium | 55 | 20 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 35 | 12 |
| Amlodipine Besylate | 33 | 17 |
| Budesonide/Formoterol Fumaratebrand: Symbicort | 31 | — |
Practice location
Mailing address
Additional practice locations (1)
- 300 Hartle CtNapa, CA 94559-4078Phone: (707) 254-1775
Registry dates
- Enumerated
- 2022-09-13
- Last updated
- 2026-03-07
- Certified
- 2026-03-07
Frequently asked questions
- What is Mason Donnell's NPI number?
- Mason Donnell's National Provider Identifier (NPI) is 1891417390, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mason Donnell's specialty?
- Mason Donnell is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mason Donnell located?
- Mason Donnell's practice location on file with NPPES is 4000 Civic Center Dr, San Rafael, CA 94903-4171.
- What is Mason Donnell's phone number?
- The practice phone number listed in the NPPES registry for Mason Donnell is (415) 492-3333.
- Does Mason Donnell accept Medicare?
- Mason Donnell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mason Donnell's NPI active?
- Yes — Mason Donnell's NPI (1891417390) is active in the NPPES registry as of the last update on 2026-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.