William Douglas Farmer, M.D.
NPI 1689660771ActiveIndividual· Internal Medicine· Hamden, CT
Internal Medicine (M.D.) in Hamden, Connecticut, trained at Loma Linda University School of Medicine (class of 1996). Their prescriptions cost Medicare Part D more than their services did: $511,395 for 2,911 claims, against $26,224 paid for services in 2024. Amgen Inc. was the largest of 4 companies reporting payments in 2025, $106.85 in all, mostly food and beverage.
Overview
| NPI | 1689660771 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Sep 23, 2005 |
| Last updated in NPPES | Oct 6, 2026 |
| Certified by provider | Oct 6, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 038805 | CT |
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 - Family Practice (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 61 |
|---|---|
| Services billed | 596 across 25 procedure codes |
| Paid by Medicare | $26,224 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,911 · 6,615 30-day fills |
|---|---|
| Patients | 143 |
| Total drug cost | $511,395 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Loma Linda University School of Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Family Practice |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliation
- Yale-New Haven HospitalNew Haven, CT
Industry payments (Open Payments)
- 2025$106.85 · 5 payments from 4 companies
- 2024$147.34 · 5 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $30.57 | 2 |
| Lilly USA, LLC | $29.95 | 1 |
| Idorsia Pharmaceuticals US Inc | $23.82 | 1 |
| Bayer Healthcare Pharmaceuticals Inc. | $22.51 | 1 |
What the 2025 payments were for
- Food and Beverage$106.85 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 53 internal medicine physicians in Hamden · All internal medicine physicians in Connecticut