Rosemarie Bustos Diaz
Emergency Medicine Physician · Santa Monica, CA
Rosemarie Bustos Diaz is an emergency medicine physician with a practice address in Santa Monica, California, and NPI 1215317441, issued on Jun 3, 2015. Check the license (California A171845, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Rosemarie Bustos Diaz
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A171845 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1250 16TH St, Santa Monica, CA 90404
- Phone
- (310) 794-7700
- Enumerated
- Jun 3, 2015
- Record last updated
- Apr 12, 2023
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1250 16TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Melanie Altamirano-CariagaNurse Practitioner1588060198
- Miguel Arellano, NPNurse Practitioner1295460806
- Jason Bahk, M.D.Hospitalist Physician1245573187
- Christopher BelfourEmergency Medicine Physician1518259837
- Umesh Bhagia, MDSurgery Physician1568468528
- Cassandra Blaylock, NPHematology & Oncology Physician1588043400
Verify Rosemarie Bustos Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A171845Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average emergency medicine physician in 2024
98 Medicare Part D claims for 73 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Cephalexin16 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): 100 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).
Rosemarie Bustos Diaz among 7,751 emergency medicine physician records in California
Rosemarie Bustos Diaz is one of 7,751 emergency 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 2015, is newer than 72% of them.
- NPI issued2015 · 72% of these records are older, 25% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2023 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Santa Monica → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Isaac Bash, MDSanta Monica, CA 904041619934643
- Victor Candioty, MDSanta Monica, CA 904041437116472
- Michelle Charfen, M.D.Santa Monica, CA 904041588602486
- Edward Cotner, MDSanta Monica, CA 904041023074044
- Patricia Drum-Lal, PACSanta Monica, CA 904041639136674
- Walid Ghurabi, D.O.Santa Monica, CA 904041073566931
- Daniel Grossman, MDSanta Monica, CA 904041386601326
- Amy Kijner, PASanta Monica, CA 904041235197849
Common questions
What is Rosemarie Bustos Diaz's NPI number?
Rosemarie Bustos Diaz's National Provider Identifier (NPI) is 1215317441, issued on Jun 3, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Rosemarie Bustos Diaz located?
The NPPES record lists a practice address at 1250 16TH St, Santa Monica, CA, 90404. Phone: (310) 794-7700. Providers update this record themselves, so call before visiting.
How can I verify Rosemarie Bustos Diaz's license?
NPPES lists California license number A171845, 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 Rosemarie Bustos Diaz prescribe under Medicare Part D?
In 2024, Rosemarie Bustos Diaz had 98 Medicare Part D claims for 73 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Rosemarie Bustos Diaz's MIPS final score?
The 2023 MIPS final score is 100 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.