William Peter Sim, M.D.
NPI 1902166531ActiveIndividual· Internal Medicine· Cerritos, CA
Internal Medicine (M.D.) in Cerritos, California, trained at Un of California, Irvine, College of Medicine (class of 2012). Their prescriptions cost Medicare Part D more than their services did: $298,423 for 5,679 claims, against $1,387 paid for services in 2024. Exact Sciences Corporation reported $104.49 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1902166531 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | May 16, 2012 |
| Last updated in NPPES | Dec 10, 2021 |
| Certified by provider | Dec 7, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A130389 | CA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 12 |
|---|---|
| Services billed | 22 across 4 procedure codes |
| Paid by Medicare | $1,387 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,679 · 14,917 30-day fills |
|---|---|
| Patients | 682 |
| Total drug cost | $298,423 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | Un of California, Irvine, College of Medicine |
|---|---|
| Graduation year | 2012 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Southern California Permanente Medical GroupRedlands, CA · 11,293 clinicians
Industry payments (Open Payments)
- 2025$104.49 · 4 payments from 1 company
- 2024$18.23 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exact Sciences Corporation | $104.49 | 4 |
What the 2025 payments were for
- Food and Beverage$104.49 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 36 internal medicine physicians in Cerritos · All internal medicine physicians in California