Ferrin Katarina Ruiz, MD
NPI 1477998870ActiveIndividual· Specialist· Montebello, CA
Specialist (MD) in Montebello, California, trained at Yale University School of Medicine (class of 2013). Their prescriptions cost Medicare Part D more than their services did: $342,817 for 4,067 claims, against $20,080 paid for services in 2024. Gilead Sciences, Inc. was the largest of 5 companies reporting payments in 2025, $98.09 in all, mostly food and beverage.
Overview
| NPI | 1477998870 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 30, 2013 |
| Last updated in NPPES | Jan 16, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Specialist Primary | 174400000X | A132956 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 91 |
|---|---|
| Services billed | 477 across 32 procedure codes |
| Paid by Medicare | $20,080 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,067 · 8,892 30-day fills |
|---|---|
| Patients | 398 |
| Total drug cost | $342,817 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | Yale University School of Medicine |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Pediatric Medicine |
Medical groups
- R. Ruiz MD A Professional CorporationMontebello, CA · 3 clinicians
- Ruben Ruiz M D A Medical CorporationOntario, CA · 2 clinicians
Other facilities
- California Home Health Services, Inc.Home health agency · Burbank, CA
Industry payments (Open Payments)
- 2025$98.09 · 5 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $27.15 | 1 |
| Merck Sharp & Dohme LLC | $19.79 | 1 |
| Dexcom, Inc. | $17.95 | 1 |
| Hologic Sales and Service, LLC | $17.73 | 1 |
| Novo Nordisk Inc | $15.47 | 1 |
What the 2025 payments were for
- Food and Beverage$98.09 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 20 Specialist providers in Montebello · All Specialist providers in California