Pennapa S. Chan, MD
NPI 1457405128ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Madison, WI
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) in Madison, Wisconsin, trained at Southern Illinois University School of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $124,497 for 393 claims, against $4,362 paid for services in 2024.
Overview
| NPI | 1457405128 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jan 22, 2007 |
| Last updated in NPPES | Dec 16, 2024 |
| Certified by provider | Dec 16, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 41501-020 | WI |
| Internal Medicine, Endocrinology, Diabetes & Metabolism | 207RE0101X | MD212597 | OR |
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 - Endocrinology (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 40 |
|---|---|
| Services billed | 70 across 11 procedure codes |
| Paid by Medicare | $4,362 |
Part D prescriptions in 2024
| Prescriptions (claims) | 393 · 920 30-day fills |
|---|---|
| Patients | 81 |
| Total drug cost | $124,497 |
| Generic share | 44% of claims |
Education and affiliations
| Medical school | Southern Illinois University School of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- University of Wisconsin Medical Foundation IncMadison, WI · 2,553 clinicians
Hospital affiliations
- Unitypoint Health - MeriterMadison, WI
- University of Wi Hospitals & Clinics AuthorityMadison, WI
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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