Gretel Dayna D'Souza, M.D.
Rheumatology Physician · Sylmar, CA
Gretel Dayna D'Souza, M.D. is a rheumatology physician with a practice address in Sylmar, California, and NPI 1679138531, issued on May 7, 2019. Check the license (California 178675, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gretel Dayna D'Souza
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 178675 CA
Self-reported in NPPES; status is on the state search - Practice location
- 14445 Olive View Dr, Sylmar, CA 91342
- Phone
- (747) 210-3205
- Enumerated
- May 7, 2019
- Record last updated
- Jul 27, 2022
- Fax
- (805) 569-8358
- Medicare enrollment
- Enrolled (PECOS I20240826004035); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Also registered at 14445 Olive View Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nasser Abdo, MDInternal Medicine Physician1306911649
- Gezman Abdullahi, M.D.Internal Medicine Physician1225394380
- Moyosore Abere, NPNurse Practitioner1225667314
- Ammini Abraham, MDAnesthesiology Physician1467531541
- Margarita Acosta, RN, AGACNPAcute Care Nurse Practitioner1609202415
- Fredric Adler, MDInternal Medicine Physician1356376735
Verify Gretel Dayna D'Souza in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 178675Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average rheumatology physician in 2024
228 Medicare Part D claims for 75 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D.
Most prescribed
- Methotrexate38 claims
- Hydroxychloroquine Sulfate26 claims
- Omeprazole17 claims
- Prednisone16 claims
- Gabapentin14 claims
- Pilocarpine Hcl13 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: $1,468.85
35 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 4,486 providers of this specialty with any payment received $8,538.33 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
- Lakeside Medical Organization A Medical Group IncBurbank, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gretel Dayna D'Souza among 926 rheumatology physician records in California
Gretel Dayna D'Souza, M.D. 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 2019, is newer than 93% of them.
- NPI issued2019 · 93% of these records are older, 5% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2018 · median 2003 among the 641 with a school on file
- Record last updated2022 · 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 Sylmar → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- James Chung, MDSylmar, CA 913421588742415
- Tamara Dahhan, D.O.Sylmar, CA 913421093074627
- Primal Kaur, MD, MBASylmar, CA 913421851380786
- Andrew Wong, M.D.Sylmar, CA 913421427137967
- Rosa Artola, D.O.Mission Hills, CA 913451962848978
- Joseph Mehrabi, MDMission Hills, CA 913451942886379
- Hitasha Singh, M.D.Mission Hills, CA 913451508189143
- Paul Sussman, MD.Mission Hills, CA 913451336168863
Common questions
What is Gretel Dayna D'Souza, M.D.'s NPI number?
Gretel Dayna D'Souza, M.D.'s National Provider Identifier (NPI) is 1679138531, issued on May 7, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Gretel Dayna D'Souza, M.D. located?
The NPPES record lists a practice address at 14445 Olive View Dr, Sylmar, CA, 91342. Phone: (747) 210-3205. Providers update this record themselves, so call before visiting.
How can I verify Gretel Dayna D'Souza, M.D.'s license?
NPPES lists California license number 178675, 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 Gretel Dayna D'Souza, M.D. prescribe under Medicare Part D?
In 2024, Gretel Dayna D'Souza, M.D. had 228 Medicare Part D claims for 75 beneficiaries; the average among rheumatology physician prescribers was 1,978. 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.