Melissa Siew, M.D.
NPI 1780096099ActiveIndividual· Internal Medicine· Westminster, CA
Internal Medicine (M.D.) in Westminster, California, licensed in CA, with an NPI issued in May 2014. In 2024 Medicare paid $339,795 for 395 patients, and Part D covered 3,458 of their prescriptions, 86% of them generic. Lists Providence Mission Hospital as a hospital affiliation.
Overview
| NPI | 1780096099 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | May 21, 2014 |
| Last updated in NPPES | Sep 18, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A132081 | CA |
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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 395 |
|---|---|
| Services billed | 4,467 across 24 procedure codes |
| Paid by Medicare | $339,795 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,458 · 3,669 30-day fills |
|---|---|
| Patients | 291 |
| Total drug cost | $225,939 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Internal Medicine |
Hospital affiliation
- Providence Mission HospitalMission Viejo, CA
Other facilities
- Care Plus Home HealthHome health agency · Laguna Hills, CA
- Graceland Hospice CareHospice · Orange, CA
- Palm Terrace Healthcare & Rehabilitation CenterNursing home · Laguna Hills, CA
- San Juan Hills Healthcare CenterNursing home · San Juan Capistrano, CA
- Villa Valencia Healthcare CenterNursing home · Laguna Hills, CA
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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