Roxanne Giselle G Lim, MD
NPI 1154587368ActiveIndividual· Internal Medicine, Gastroenterology· Newport Beach, CA
Internal Medicine, Gastroenterology (MD) with United Medical Doctors, practicing in Newport Beach, California. Their prescriptions cost Medicare Part D more than their services did: $783,184 for 1,354 claims, against $186,573 paid for services in 2024. Phathom Pharmaceuticals, Inc. was the largest of 13 companies reporting payments in 2025, $3,217 in all, mostly food and beverage. Lists Hoag Memorial Hospital Presbyterian as a hospital affiliation.
Overview
| NPI | 1154587368 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 6, 2008 |
| Last updated in NPPES | Apr 11, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A128032 | CA |
| Internal Medicine, Gastroenterology | 207RG0100X | 2012026122 | MO |
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 - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 522 |
|---|---|
| Services billed | 1,793 across 32 procedure codes |
| Paid by Medicare | $186,573 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,354 · 2,895 30-day fills |
|---|---|
| Patients | 431 |
| Total drug cost | $783,184 |
| Generic share | 78% of claims |
Education and affiliations
| Graduation year | 2006 |
|---|---|
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- United Medical DoctorsMurrieta, CA · 173 clinicians
Hospital affiliation
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
Industry payments (Open Payments)
- 2025$3,217 · 112 payments from 13 companies
- 2024$2,490 · 130 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Phathom Pharmaceuticals, Inc. | $771.34 | 8 |
| Aimmune Therapeutics, Inc. | $685.90 | 29 |
| Janssen Biotech, Inc. | $360.52 | 14 |
| Ardelyx, Inc. | $327.63 | 15 |
| Abbvie Inc. | $235.21 | 14 |
What the 2025 payments were for
- Food and Beverage$2,473 · 110 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$645.00 · 1 payment
- Education$99.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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