Constant K.S. Chan, M.D.
NPI 1730195645ActiveIndividual· Family Medicine· Lynwood, CA
Family Medicine (M.D.) in Lynwood, California, licensed in CA, with an NPI issued in July 2006. Their prescriptions cost Medicare Part D more than their services did: $864,132 for 5,995 claims, against $24,371 paid for services in 2024. Madrigal Pharmaceuticals was the largest of 37 companies reporting payments in 2025, $6,116 in all, mostly food and beverage.
Overview
| NPI | 1730195645 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jul 31, 2006 |
| Last updated in NPPES | Mar 7, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | A40174 | CA |
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 - General Practice (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 63 |
|---|---|
| Services billed | 618 across 28 procedure codes |
| Paid by Medicare | $24,371 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,995 · 12,085 30-day fills |
|---|---|
| Patients | 408 |
| Total drug cost | $864,132 |
| Generic share | 81% of claims |
Education and affiliations
| Graduation year | 1974 |
|---|---|
| Medicare specialty | General Practice |
Industry payments (Open Payments)
- 2025$6,116 · 266 payments from 37 companies
- 2024$6,007 · 280 payments from 35 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $1,199 | 30 |
| Abbvie Inc. | $689.87 | 40 |
| Verona Pharma, Inc. | $384.38 | 12 |
| Amgen Inc. | $359.10 | 18 |
| Novo Nordisk Inc | $316.31 | 15 |
What the 2025 payments were for
- Food and Beverage$6,116 · 266 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Family Medicine providers in Lynwood
- 1245167196
- 1154415925
- 1720378508
- 1225076383
- 1497964548
- 1093873614
- 1275421794
- 1033635107
- 1255953311
- 1245389238
- 1992731798
- 1548151632