Gretel D'Souza, M.D.
NPI 1679138531 · Rheumatology Physician · Sylmar, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gretel D'Souza, M.D. is a Rheumatology Physician provider in Sylmar, CA (NPI 1679138531).
Provider details
- NPI number
- 1679138531
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
7 yrs in NPPES registry
- Profile completeness33% of score
83% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 38 | 17 |
| Hydroxychloroquine Sulfate | 26 | 15 |
| Omeprazole | 17 | — |
| Prednisone | 16 | 14 |
| Gabapentin | 14 | 12 |
| Pilocarpine Hcl | 13 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,469 across 35 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- Sbch, Medical Education400 W Pueblo StreetSanta Barbara, CA 93015Phone: (805) 569-7315Fax: (805) 569-8358
Registry dates
- Enumerated
- 2019-05-07
- Last updated
- 2022-07-27
- Certified
- 2022-07-27
Frequently asked questions
- What is Gretel D'Souza's NPI number?
- Gretel D'Souza's National Provider Identifier (NPI) is 1679138531, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gretel D'Souza's specialty?
- Gretel D'Souza is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Gretel D'Souza located?
- Gretel D'Souza's practice location on file with NPPES is 14445 Olive View Dr, Sylmar, CA 91342-1437.
- What is Gretel D'Souza's phone number?
- The practice phone number listed in the NPPES registry for Gretel D'Souza is (747) 210-3205.
- Does Gretel D'Souza accept Medicare?
- Gretel D'Souza is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gretel D'Souza's NPI active?
- Yes — Gretel D'Souza's NPI (1679138531) is active in the NPPES registry as of the last update on 2022-07-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.