Brian Nicholas Mason, DO
Family Medicine Physician · Santa Monica, CA
Brian Nicholas Mason, DO is a family medicine physician with a practice address in Santa Monica, California, and NPI 1942889217, issued on Apr 5, 2021. Check the license (California 20A23853, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Brian Nicholas Mason
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A23853 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1245 16TH St Ste 125, Santa Monica, CA 90404
- Phone
- (310) 315-8900
- Enumerated
- Apr 5, 2021
- Record last updated
- Jun 2, 2026
- Fax
- (310) 315-8902
- Medicare enrollment
- Enrolled (PECOS I20250623003784); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1245 16TH St Ste 125
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nupur Agrawal, M.D.Internal Medicine Physician1821409822
- Oluwatofehinti Akande, MDPediatrics Physician1225659089
- Cindy Akin, LCSWClinical Social Worker1528885746
- Dominique DabijaEmergency Medicine Physician1386106102
- Thomas ElliottPediatrics Physician1609372606
- Sergio EscobedoPsychologist1518637792
Verify Brian Nicholas Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A23853Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average family medicine physician in 2024
936 Medicare Part D claims for 148 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium83 claims
- Metformin Hcl Er32 claims
- Gabapentin31 claims
- Lisinopril27 claims
- Omeprazole26 claims
- Losartan Potassium25 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.
Bills Medicare through 3 group practices
- Hospitalist Group OF Montebello IncS El Monte, CA
- IM-Fsr IncSanta Ana, CA
- Southeastern Physician Services PCMemphis, TN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brian Nicholas Mason among 17,133 family medicine physician records in California
Brian Nicholas Mason, DO 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 2021, is newer than 91% of them.
- NPI issued2021 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2020 · 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).
192 family medicine physician records list a practice address in Santa Monica
They are 192 of the 5,151 NPPES records with a practice address in Santa Monica, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Santa Monica → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Caroline Close, MDSanta Monica, CA 904041467497024
- Lawrence Dardick, MDSanta Monica, CA 904041740200138
- Lillian Gelberg, MDSanta Monica, CA 904041639192487
- Benjamin GilmoreSanta Monica, CA 904041396770178
- Raouf Hallis, MDSanta Monica, CA 904041386688687
- Mary Marfisee, M.D.Santa Monica, CA 904041700829934
- James Murray, MDSanta Monica, CA 904041659307452
- Michael Nagata, MDSanta Monica, CA 904041124054184
Common questions
What is Brian Nicholas Mason, DO's NPI number?
Brian Nicholas Mason, DO's National Provider Identifier (NPI) is 1942889217, issued on Apr 5, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Brian Nicholas Mason, DO located?
The NPPES record lists a practice address at 1245 16TH St Ste 125, Santa Monica, CA, 90404. Phone: (310) 315-8900. Providers update this record themselves, so call before visiting.
How can I verify Brian Nicholas Mason, DO's license?
NPPES lists California license number 20A23853, 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 Brian Nicholas Mason, DO prescribe under Medicare Part D?
In 2024, Brian Nicholas Mason, DO had 936 Medicare Part D claims for 148 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.