Grant Eric Barber, MD
NPI 1528422847ActiveIndividual· Internal Medicine, Gastroenterology· Stanford, CA
Internal Medicine, Gastroenterology (MD) in Stanford, California, trained at Harvard Medical School (class of 2016). Their prescriptions cost Medicare Part D more than their services did: $336,140 for 150 claims, against $34,981 paid for services in 2024. Mauna Kea Technologies, Inc. reported $29.45 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1528422847 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Apr 12, 2016 |
| Last updated in NPPES | Apr 15, 2024 |
| Certified by provider | Apr 15, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A151462 | CA |
| Internal Medicine | 207R00000X | A151462 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 139 |
|---|---|
| Services billed | 316 across 31 procedure codes |
| Paid by Medicare | $34,981 |
Part D prescriptions in 2024
| Prescriptions (claims) | 150 · 251 30-day fills |
|---|---|
| Patients | 69 |
| Total drug cost | $336,140 |
| Generic share | 71% of claims |
Education and affiliations
| Medical school | Harvard Medical School |
|---|---|
| Graduation year | 2016 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$29.45 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Mauna Kea Technologies, Inc. | $29.45 | 1 |
What the 2025 payments were for
- Food and Beverage$29.45 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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