Matthew Russell Callahan, M.D.
NPI 1083901839ActiveIndividual· Hospitalist· San Diego, CA
Hospitalist (M.D.) with Scripps Health, practicing in San Diego, California. In 2024 Medicare paid $26,692 for 125 patients, and Part D covered 402 of their prescriptions, 87% of them generic. Pfizer Inc. was the largest of 2 companies reporting payments in 2025, $42.17 in all, mostly food and beverage. Lists Scripps Mercy Hospital as a hospital affiliation.
Overview
| NPI | 1083901839 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 30, 2011 |
| Last updated in NPPES | Nov 20, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Hospitalist Primary | 208M00000X | 131315 | CA |
| Family Medicine | 207Q00000X | 131315 | CA |
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 - Hospitalist (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 125 |
|---|---|
| Services billed | 430 across 9 procedure codes |
| Paid by Medicare | $26,692 |
Part D prescriptions in 2024
| Prescriptions (claims) | 402 · 473 30-day fills |
|---|---|
| Patients | 153 |
| Total drug cost | $34,659 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Hospitalist |
| Secondary specialties | Family Practice |
Medical group
- Scripps HealthLa Jolla, CA · 1,433 clinicians
Hospital affiliation
- Scripps Mercy HospitalSan Diego, CA
Industry payments (Open Payments)
- 2025$42.17 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $28.07 | 1 |
| Sirtex Medical Inc | $14.10 | 1 |
What the 2025 payments were for
- Food and Beverage$42.17 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 175 hospitalists in San Diego · All hospitalists in California