Robin A. Matuk, M.D.
NPI 1245320563ActiveIndividual· Internal Medicine, Gastroenterology· Bakersfield, CA
Internal Medicine, Gastroenterology (M.D.) with Kern Gastroenterology Medical Group, practicing in Bakersfield, California. Their prescriptions cost Medicare Part D more than their services did: $1,174,797 for 1,970 claims, against $203,219 paid for services in 2024. Janssen Biotech, Inc. was the largest of 10 companies reporting payments in 2025, $839.09 in all, mostly food and beverage. Lists Adventist Health Bakersfield and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1245320563 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Oct 15, 2006 |
| Last updated in NPPES | Jul 8, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A82677 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,002 |
|---|---|
| Services billed | 3,637 across 31 procedure codes |
| Paid by Medicare | $203,219 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,970 · 3,005 30-day fills |
|---|---|
| Patients | 473 |
| Total drug cost | $1,174,797 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 2001 |
|---|---|
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Kern Gastroenterology Medical GroupBakersfield, CA · 6 clinicians
Hospital affiliations
- Adventist Health BakersfieldBakersfield, CA
- Adventist Health Tehachapi ValleyTehachapi, CA
- Bakersfield Memorial HospitalBakersfield, CA
- Cedars-Sinai Medical CenterLos Angeles, CA
- Mercy HospitalBakersfield, CA
Industry payments (Open Payments)
- 2025$839.09 · 35 payments from 10 companies
- 2024$820.43 · 25 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $210.07 | 4 |
| Gilead Sciences, Inc. | $181.68 | 4 |
| Abbvie Inc. | $146.21 | 9 |
| Ipsen Biopharmaceuticals, Inc | $75.24 | 1 |
| Madrigal Pharmaceuticals | $62.13 | 3 |
What the 2025 payments were for
- Food and Beverage$839.09 · 35 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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