Kathryn Ann Mason, MD
Occupational Medicine Physician · Bakersfield, CA
Kathryn Ann Mason, MD is an occupational medicine physician with a practice address in Bakersfield, California, and NPI 1679640502, issued on Nov 29, 2006. Check the license (California A61771, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kathryn Ann Mason
- Credential
- MD
- Primary taxonomy
- Occupational Medicine Physician 2083X0100X
- License number
- A61771 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3733 San Dimas St, Bakersfield, CA 93301
- Phone
- (800) 353-5400
- Enumerated
- Nov 29, 2006
- Record last updated
- Sep 23, 2008 (not updated in 18 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest occupational medicine physician records → All 415 in California → Look up another NPI →
Also registered at 3733 San Dimas St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Kathryn Ann Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A61771Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average occupational medicine physician in 2024
16 Medicare Part D claims, against an average of 794 among the 463 providers of this specialty who prescribed in Part D.
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.
Kathryn Ann Mason among 415 occupational medicine physician records in California
Kathryn Ann Mason, MD is one of 415 occupational medicine physician records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 57% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileNo · 12% of these records are
- Record last updated2008 · 75% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2083X0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Occupational Medicine Physician providers in California
There are 415 occupational medicine physician records in California.
All 415 in California → Every provider in Bakersfield → Occupational Medicine Physician nationwide →
The 8 occupational medicine physician records with the nearest ZIP codes
- Larry Cho, M.D.Bakersfield, CA 933011487838090
- Cecilie Deza, M.D.Bakersfield, CA 933011538343041
- Mitra Kamali, M.D.Bakersfield, CA 933011821375403
- David Field, M.D.Bakersfield, CA 933061598790834
- Rahila Andrews-Steele, M.D., M.O.H.Bakersfield, CA 933091205062395
- Richard Sall, M.D.Bakersfield, CA 933091477603181
- Oliver Chiong, M.D.Lemoore, CA 932461063851962
- Miguel Montoya-Villagomez, D.O.Lemoore, CA 932461427497213
Common questions
What is Kathryn Ann Mason, MD's NPI number?
Kathryn Ann Mason, MD's National Provider Identifier (NPI) is 1679640502, issued on Nov 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kathryn Ann Mason, MD located?
The NPPES record lists a practice address at 3733 San Dimas St, Bakersfield, CA, 93301. Phone: (800) 353-5400. Providers update this record themselves, so call before visiting.
How can I verify Kathryn Ann Mason, MD's license?
NPPES lists California license number A61771, 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 Kathryn Ann Mason, MD prescribe under Medicare Part D?
In 2024, Kathryn Ann Mason, MD had 16 Medicare Part D claims; the average among occupational medicine physician prescribers was 794. 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.