Mei Lai So, MD
NPI 1669935441ActiveIndividual· Internal Medicine· Tucson, AZ
Internal Medicine (MD) in Tucson, Arizona, trained at University of Arizona College of Medicine (class of 2019). In 2024 Medicare paid $29,696 for 116 patients, and Part D covered 243 of their prescriptions, 84% of them generic. Mallinckrodt Hospital Products Inc. was the largest of 6 companies reporting payments in 2025, $249.24 in all, mostly food and beverage.
Overview
| NPI | 1669935441 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Apr 9, 2019 |
| Last updated in NPPES | Jun 19, 2026 |
| Certified by provider | Jun 19, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 65443 | AZ |
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 (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 116 |
|---|---|
| Services billed | 403 across 7 procedure codes |
| Paid by Medicare | $29,696 |
Part D prescriptions in 2024
| Prescriptions (claims) | 243 · 299 30-day fills |
|---|---|
| Patients | 86 |
| Total drug cost | $25,063 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | University of Arizona College of Medicine |
|---|---|
| Graduation year | 2019 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Banner-University Medical GroupTucson, AZ · 1,072 clinicians
- Arizona Community Physicians PCTucson, AZ · 161 clinicians
Hospital affiliations
- Banner - University Medical Center Tucson CampusTucson, AZ
- Banner-University Medical Center South CampusTucson, AZ
- Tucson Medical CenterTucson, AZ
Other facilities
- Dependable Home Health, IncHome health agency · Tucson, AZ
Industry payments (Open Payments)
- 2025$249.24 · 8 payments from 6 companies
- 2024$121.83 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Mallinckrodt Hospital Products Inc. | $121.49 | 1 |
| Astrazeneca Pharmaceuticals LP | $47.69 | 3 |
| Xeris Pharmaceuticals, Inc. | $23.95 | 1 |
| Abbott Laboratories | $19.99 | 1 |
| Novo Nordisk Inc | $18.65 | 1 |
What the 2025 payments were for
- Food and Beverage$249.24 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 742 internal medicine physicians in Tucson · All internal medicine physicians in Arizona