John C. Koumas, D.O.
NPI 1134111958ActiveIndividual· Family Medicine· West Covina, CA
Family Medicine (D.O.) in West Covina, California, trained at College of Osteo Med of the Pacific at Pomona (class of 1987). Their prescriptions cost Medicare Part D more than their services did: $263,022 for 3,834 claims, against $44,634 paid for services in 2024. Lilly USA, LLC was the largest of 2 companies reporting payments in 2025, $77.87 in all, mostly food and beverage.
Overview
| NPI | 1134111958 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Aug 17, 2005 |
| Last updated in NPPES | Feb 1, 2024 |
| Certified by provider | Feb 1, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 20A5515 | 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 - Family Practice (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 198 |
|---|---|
| Services billed | 614 across 29 procedure codes |
| Paid by Medicare | $44,634 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,834 · 9,494 30-day fills |
|---|---|
| Patients | 422 |
| Total drug cost | $263,022 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | College of Osteo Med of the Pacific at Pomona |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Family Practice |
| Telehealth | Offers telehealth |
Medical groups
- Emanate Health Medical Care FoundationWest Covina, CA · 86 clinicians
- Lake Forest Medical Group, Inc.Lake Forest, CA · 2 clinicians
Hospital affiliations
- Emanate Health Foothill Presbyterian HospitalGlendora, CA
- Emanate Health Inter-Community HospitalCovina, CA
- Memorialcare Saddleback Medical CenterLaguna Hills, CA
- Pomona Valley Hospital Medical CenterPomona, CA
Other facilities
- Care Plus Home HealthHome health agency · Laguna Hills, CA
Industry payments (Open Payments)
- 2025$77.87 · 3 payments from 2 companies
- 2024$25.00 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $58.67 | 2 |
| Glaxosmithkline, LLC. | $19.20 | 1 |
What the 2025 payments were for
- Food and Beverage$77.87 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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