Shirley Pak So, M.D.
NPI 1639466592ActiveIndividual· Internal Medicine, Geriatric Medicine· Worcester, MA
Internal Medicine, Geriatric Medicine (M.D.) with Umass Memorial Medical Group Inc, practicing in Worcester, Massachusetts. Their prescriptions cost Medicare Part D more than their services did: $391,339 for 7,822 claims, against $73,542 paid for services in 2024.
Overview
| NPI | 1639466592 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 29, 2011 |
| Last updated in NPPES | May 1, 2022 |
| Certified by provider | May 1, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Geriatric Medicine Primary | 207RG0300X | 249041 | MA |
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 - Geriatric Medicine (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 167 |
|---|---|
| Services billed | 843 across 9 procedure codes |
| Paid by Medicare | $73,542 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,822 · 7,851 30-day fills |
|---|---|
| Patients | 172 |
| Total drug cost | $391,339 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 2004 |
|---|---|
| Medicare specialty | Geriatric Medicine |
| Secondary specialties | Internal Medicine |
Medical group
- Umass Memorial Medical Group IncWorcester, MA · 2,516 clinicians
Other facilities
- Notre Dame HospiceHospice · Worcester, MA
- Notre Dame Long Term Care CenterNursing home · Worcester, MA
- Shrewsbury Rehabilitation and Nursing at SouthgateNursing home · Shrewsbury, 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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