Gregory S. Larsen, D.O.
NPI 1104073709ActiveIndividual· Emergency Medicine· Colton, CA
Emergency Medicine (D.O.) with Cep America - California and 2 other groups, practicing in Colton, California. 656 Medicare patients in 2024, $86,085 paid; nearly all of their 457 Part D prescriptions were generic (93%). Stryker Corporation reported $173.17 in payments in 2025, mostly food and beverage. Lists Adventist Health Howard Memorial and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1104073709 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Aug 26, 2008 |
| Last updated in NPPES | Oct 30, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Emergency Medicine Primary | 207P00000X | 20A10521 | 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 - Emergency Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 656 |
|---|---|
| Services billed | 964 across 43 procedure codes |
| Paid by Medicare | $86,085 |
Part D prescriptions in 2024
| Prescriptions (claims) | 457 · 463 30-day fills |
|---|---|
| Patients | 294 |
| Total drug cost | $7,283 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 2007 |
|---|---|
| Medicare specialty | Emergency Medicine |
Medical groups
- Cep America - CaliforniaPomona, CA · 1,292 clinicians
- San Francisco Emergency Medical AssociatesSan Francisco, CA · 75 clinicians
- Pacific Redwood Medical Group IncUkiah, CA · 58 clinicians
Hospital affiliations
- Adventist Health Howard MemorialWillits, CA
- Adventist Health Mendocino CoastFort Bragg, CA
- Marinhealth Medical CenterGreenbrae, CA
- Sutter Santa Rosa Regional HospitalSanta Rosa, CA
Industry payments (Open Payments)
- 2025$173.17 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Stryker Corporation | $173.17 | 1 |
What the 2025 payments were for
- Food and Beverage$173.17 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 111 emergency medicine physicians in Colton · All emergency medicine physicians in California