Pei Fang Sun, MD
NPI 1225171754ActiveIndividual· Internal Medicine· Wallingford, CT
Internal Medicine (MD) with Pei Sun Md.Llc, practicing in Wallingford, Connecticut. Their prescriptions cost Medicare Part D more than their services did: $345,283 for 5,233 claims, against $27,626 paid for services in 2024. Medtronic, Inc. was the largest of 2 companies reporting payments in 2025, $45.78 in all, mostly food and beverage. Lists Griffin Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1225171754 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Feb 15, 2007 |
| Last updated in NPPES | Aug 6, 2026 |
| Certified by provider | Aug 6, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 37546 | 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 | 176 |
|---|---|
| Services billed | 433 across 19 procedure codes |
| Paid by Medicare | $27,626 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,233 · 12,536 30-day fills |
|---|---|
| Patients | 814 |
| Total drug cost | $345,283 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 1983 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Pei Sun Md.LlcWallingford, CT · 4 clinicians
Hospital affiliations
- Griffin HospitalDerby, CT
- Midstate Medical CenterMeriden, CT
- Yale-New Haven HospitalNew Haven, CT
Other facilities
- Elara CaringHome health agency · Rocky Hill, CT
- Hartford Healthcare at HomeHome health agency · East Hartford, CT
- Masonicare Home Health & Hospice, IncHome health agency · Wallingford, CT
Industry payments (Open Payments)
- 2025$45.78 · 2 payments from 2 companies
- 2024$55.15 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medtronic, Inc. | $25.40 | 1 |
| Exact Sciences Corporation | $20.38 | 1 |
What the 2025 payments were for
- Food and Beverage$45.78 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other internal medicine physicians in Wallingford
- 1245729631
- 1306860432
- 1417489253
- 1487696910
- 1881909158
- 1962847509
- 1164165593
- 1003282427
- 1063499507
- 1073755534
- 1245288265
- 1255619052
All 40 internal medicine physicians in Wallingford · All internal medicine physicians in Connecticut