William Joshua Martin, MD
Rheumatology Physician · Santa Monica, CA
William Joshua Martin, MD is a rheumatology physician with a practice address in Santa Monica, California, and NPI 1174632970, issued on Aug 29, 2006. Check the license (California A107051, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Joshua Martin
- Credential
- MD
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License numbers
- A107051 CA
ML20008603 WA
Self-reported in NPPES; status is on the state search - Practice location
- 2020 Santa Monica Blvd, Santa Monica, CA 90404
- Phone
- (310) 582-6350
- Enumerated
- Aug 29, 2006
- Record last updated
- Oct 2, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (310) 825-9482
- Medicaid ID
- 1174632970 CA
- Medicare enrollment
- Enrolled (PECOS I20091202000262); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Also registered at 2020 Santa Monica Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Valentina AlvadzhyanPharmacist1487017182
- Rachelle Ancona, PHARMDPharmacist1053807529
- Peter Barakat, PHARMDAmbulatory Care Pharmacist1629439468
- Ralph Buoncristiani, D.D.S.Dentist1356481683
- Nancy Bush, NPNurse Practitioner1760607212
- Elizabeth Cray, NPNurse Practitioner1740405372
Verify William Joshua Martin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A107051Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7% fewer Medicare Part D claims than the average rheumatology physician in 2024
1,842 Medicare Part D claims for 280 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. 135 claims were for opioids.
Most prescribed
- Hydroxychloroquine Sulfate257 claims
- Prednisone159 claims
- Methotrexate132 claims
- Allopurinol81 claims
- Gabapentin77 claims
- Leflunomide69 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 86.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- The Regents OF The University OF CaliforniaSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Joshua Martin among 926 rheumatology physician records in California
William Joshua Martin, MD is one of 926 rheumatology 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 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2006 · median 2003 among the 641 with a school on file
- Record last updated2012 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in California
There are 926 rheumatology physician records in California.
All 926 in California → Every provider in Santa Monica → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Amro Balki, M.D.Santa Monica, CA 904041922237593
- May Chatila, M.D.Santa Monica, CA 904041144253535
- Kristal Choi, M.D.Santa Monica, CA 904041396165882
- Amy Kehl, MDSanta Monica, CA 904041679879555
- Tanaz Kermani, M.D.Santa Monica, CA 904041720068448
- Sandra Ramer, MDSanta Monica, CA 904041508946419
- Elyse Rubenstein, MDSanta Monica, CA 904041508895095
- Katy Setoodeh, M.D.Santa Monica, CA 904041053529990
Common questions
What is William Joshua Martin, MD's NPI number?
William Joshua Martin, MD's National Provider Identifier (NPI) is 1174632970, issued on Aug 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Joshua Martin, MD located?
The NPPES record lists a practice address at 2020 Santa Monica Blvd, Santa Monica, CA, 90404. Phone: (310) 582-6350. Providers update this record themselves, so call before visiting.
How can I verify William Joshua Martin, MD's license?
NPPES lists California license number A107051, 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 William Joshua Martin, MD prescribe under Medicare Part D?
In 2024, William Joshua Martin, MD had 1,842 Medicare Part D claims for 280 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is William Joshua Martin, MD's MIPS final score?
The 2023 MIPS final score is 86.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.