Warren Lewis Fields, M.D.
NPI 1821083999ActiveIndividual· Internal Medicine· Mystic, CT
Internal Medicine (M.D.) in Mystic, Connecticut, trained at University of Connecticut School of Medicine (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $770,735 for 8,733 claims, against $163,398 paid for services in 2024. Novo Nordisk Inc was the largest of 3 companies reporting payments in 2025, $212.65 in all, mostly food and beverage.
Overview
| NPI | 1821083999 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Sep 15, 2005 |
| Last updated in NPPES | Dec 22, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 035098 | 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 - Internal Medicine (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 617 |
|---|---|
| Services billed | 2,178 across 45 procedure codes |
| Paid by Medicare | $163,398 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,733 · 17,995 30-day fills |
|---|---|
| Patients | 772 |
| Total drug cost | $770,735 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | University of Connecticut School of Medicine |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Hartford Healthcare Medical Group IncPutnam, CT · 267 clinicians
- Hospital Medicine Associates LLCWesterly, RI · 211 clinicians
Hospital affiliations
- Lawrence & Memorial HospitalNew London, CT
- Westerly HospitalWesterly, RI
- William W Backus HospitalNorwich, CT
Other facilities
- Hartford Healthcare at HomeHome health agency · East Hartford, CT
- Yale New Haven Health - Health at Home SoutheastHome health agency · Waterford, CT
- Hartford Healthcare at HomeHospice · East Hartford, CT
Industry payments (Open Payments)
- 2025$212.65 · 3 payments from 3 companies
- 2024$137.12 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $119.25 | 1 |
| Stryker Corporation | $78.13 | 1 |
| Organogenesis Inc. | $15.27 | 1 |
What the 2025 payments were for
- Food and Beverage$212.65 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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