Daniel Rengstorff, M.D.
NPI 1033295662ActiveIndividual· Internal Medicine, Gastroenterology· San Mateo, CA
Internal Medicine, Gastroenterology (M.D.) in San Mateo, California, trained at Georgetown University School of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $415,215 for 691 claims, against $77,364 paid for services in 2024. Abbvie Inc. was the largest of 2 companies reporting payments in 2025, $71.51 in all, mostly food and beverage.
Overview
| NPI | 1033295662 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 27, 2006 |
| Last updated in NPPES | Oct 7, 2024 |
| Certified by provider | Oct 7, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A75430 | 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 | 308 |
|---|---|
| Services billed | 586 across 29 procedure codes |
| Paid by Medicare | $77,364 |
Part D prescriptions in 2024
| Prescriptions (claims) | 691 · 1,100 30-day fills |
|---|---|
| Patients | 244 |
| Total drug cost | $415,215 |
| Generic share | 75% of claims |
Education and affiliations
| Medical school | Georgetown University School of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- UCSF Medical Group Business ServicesSan Francisco, CA · 1,598 clinicians
- Regents of the University of California - UCSFSan Francisco, CA · 80 clinicians
Hospital affiliations
- El Camino HealthMountain View, CA
- Peninsula Medical CenterBurlingame, CA
- Sequoia HospitalRedwood City, CA
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$71.51 · 4 payments from 2 companies
- 2024$59.79 · 3 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $61.03 | 3 |
| Laborie Medical Technologies Corp. | $10.48 | 1 |
What the 2025 payments were for
- Food and Beverage$71.51 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All Internal Medicine, Gastroenterology providers in California →