Antoinette Jenna Mason, MD
Family Medicine Physician · Santa Rosa, CA
Antoinette Jenna Mason, MD is a family medicine physician with a practice address in Santa Rosa, California, and NPI 1225534183, issued on Mar 31, 2018. Check the license (California 1243745, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Antoinette Jenna Mason
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 1243745 CA
Self-reported in NPPES; status is on the state search - Practice location
- 34 Mark West Springs RD, Santa Rosa, CA 95403
- Phone
- (707) 303-3600
- Enumerated
- Mar 31, 2018
- Record last updated
- Apr 25, 2023
- Fax
- (707) 303-3611
- Medicare enrollment
- Enrolled (PECOS I20211029002301); may accept Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2018
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 34 Mark West Springs RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Antoinette Jenna Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 1243745Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average family medicine physician in 2024
311 Medicare Part D claims for 119 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 22 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen14 claims
- Metformin Hcl Er11 claims
- Ozempic11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $17.82
1 payment: food and beverage; the largest payer was GlaxoSmithKline, LLC. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Regents Univ OF California UcsfSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Antoinette Jenna Mason among 17,133 family medicine physician records in California
Antoinette Jenna Mason, MD 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 2018, is newer than 82% of them.
- NPI issued2018 · 82% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2018 · median 2005 among the 10,652 with a school on file
- Record last updated2023 · 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).
264 family medicine physician records list a practice address in Santa Rosa
They are 264 of the 6,884 NPPES records with a practice address in Santa Rosa, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Santa Rosa → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Robert Gabbay, D.O.Santa Rosa, CA 954031821028283
- Karen Gelphman, MDSanta Rosa, CA 954031972565703
- Jennifer Lee, MDSanta Rosa, CA 954031447288204
- Azra Mael, M.D.Santa Rosa, CA 954031477596518
- Patricia Mazzetti Hiserote, D.O.Santa Rosa, CA 954031821002593
- Neil Nathan, MDSanta Rosa, CA 954031174510788
- Amelia Randolph, MDSanta Rosa, CA 954031093739708
- Edward Rose, M.D.Santa Rosa, CA 954031750354106
Common questions
What is Antoinette Jenna Mason, MD's NPI number?
Antoinette Jenna Mason, MD's National Provider Identifier (NPI) is 1225534183, issued on Mar 31, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Antoinette Jenna Mason, MD located?
The NPPES record lists a practice address at 34 Mark West Springs RD, Santa Rosa, CA, 95403. Phone: (707) 303-3600. Providers update this record themselves, so call before visiting.
How can I verify Antoinette Jenna Mason, MD's license?
NPPES lists California license number 1243745, 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.
How much does Antoinette Jenna Mason, MD prescribe under Medicare Part D?
In 2024, Antoinette Jenna Mason, MD had 311 Medicare Part D claims for 119 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.
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.