William C. Liaw, M.D.
NPI 1912954611ActiveIndividual· Internal Medicine· Wellesley, MA
Internal Medicine (M.D.) in Wellesley, Massachusetts, trained at University of Virginia School of Medicine (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $368,926 for 3,881 claims, against $105,358 paid for services in 2024.
Overview
| NPI | 1912954611 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 28, 2006 |
| Last updated in NPPES | Jun 26, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 154021 | MA |
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 (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 204 |
|---|---|
| Services billed | 1,693 across 39 procedure codes |
| Paid by Medicare | $105,358 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,881 · 8,170 30-day fills |
|---|---|
| Patients | 279 |
| Total drug cost | $368,926 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | University of Virginia School of Medicine |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Newton Wellesley Primary Care P CWellesley, MA · 8 clinicians
Hospital affiliations
- Brigham and Women Faulkner HospitalJamaica Plain, MA
- Brigham and Women's HospitalBoston, MA
- Cooley Dickinson Hospital Inc,theNorthampton, MA
- Massachusetts General HospitalBoston, MA
- Newton-Wellesley HospitalNewton, MA
Other facilities
- Mass General Brigham Home Care, IncHome health agency · Newton, MA
- Spaulding Rehabilitation HospitalInpatient rehabilitation facility · Charlestown, MA
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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All 96 internal medicine physicians in Wellesley · All internal medicine physicians in Massachusetts