Michael Shim, M.D.
NPI 1851503353ActiveIndividual· Internal Medicine, Gastroenterology· Oceanside, CA
Internal Medicine, Gastroenterology (M.D.) with North County Gastroenterology Medical Group Inc, practicing in Oceanside, California. Their prescriptions cost Medicare Part D more than their services did: $384,097 for 934 claims, against $77,135 paid for services in 2024. Janssen Biotech, Inc. was the largest of 18 companies reporting payments in 2025, $2,555 in all, mostly food and beverage. Lists Scripps Memorial Hospital - Encinitas and 1 other hospital as hospital affiliations.
Overview
| NPI | 1851503353 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 4, 2007 |
| Last updated in NPPES | Feb 25, 2021 |
| Certified by provider | Feb 25, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A88942 | 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 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 342 |
|---|---|
| Services billed | 676 across 24 procedure codes |
| Paid by Medicare | $77,135 |
Part D prescriptions in 2024
| Prescriptions (claims) | 934 · 1,472 30-day fills |
|---|---|
| Patients | 517 |
| Total drug cost | $384,097 |
| Generic share | 85% of claims |
Education and affiliations
| Graduation year | 2001 |
|---|---|
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- North County Gastroenterology Medical Group IncOceanside, CA · 11 clinicians
Hospital affiliations
- Scripps Memorial Hospital - EncinitasEncinitas, CA
- Tri-City Medical CenterOceanside, CA
Industry payments (Open Payments)
- 2025$2,555 · 124 payments from 18 companies
- 2024$1,929 · 90 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $618.17 | 25 |
| Abbvie Inc. | $497.55 | 28 |
| Takeda Pharmaceuticals U.S.A., Inc. | $268.78 | 15 |
| Celltrion USA Inc. | $216.33 | 9 |
| Pfizer Inc. | $204.78 | 9 |
What the 2025 payments were for
- Food and Beverage$2,555 · 124 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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