Weyman Lam
NPI 1225442130ActiveIndividual· Allergy & Immunology· Tulsa, OK
Allergy & Immunology with Warren Clinic Inc, practicing in Tulsa, Oklahoma. Their prescriptions cost Medicare Part D more than their services did: $1,366,350 for 1,456 claims, against $82,974 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 25 companies reporting payments in 2025, $12,109 in all, mostly speaking and faculty fees. Lists Saint Francis Hospital Muskogee and 1 other hospital as hospital affiliations.
Overview
| NPI | 1225442130 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | Yes |
| NPI issued | Jun 18, 2014 |
| Last updated in NPPES | Apr 13, 2020 |
| Certified by provider | Apr 13, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | 34414 | OK |
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 - Allergy/Immunology (OK) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 406 |
|---|---|
| Services billed | 8,762 across 28 procedure codes |
| Paid by Medicare | $82,974 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,456 · 1,916 30-day fills |
|---|---|
| Patients | 310 |
| Total drug cost | $1,366,350 |
| Generic share | 74% of claims |
Education and affiliations
| Graduation year | 2014 |
|---|---|
| Medicare specialty | Allergy/Immunology |
Medical group
- Warren Clinic IncTulsa, OK · 883 clinicians
Hospital affiliations
- Saint Francis Hospital MuskogeeMuskogee, OK
- Saint Francis Hospital, IncTulsa, OK
Industry payments (Open Payments)
- 2025$12,109 · 241 payments from 25 companies
- 2024$4,159 · 154 payments from 16 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $5,203 | 49 |
| Genzyme Corporation | $3,315 | 34 |
| Csl Behring | $500.22 | 22 |
| Pfizer Inc. | $378.02 | 24 |
| Takeda Pharmaceuticals U.S.A., Inc. | $333.28 | 13 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$6,272 · 4 payments
- Food and Beverage$5,713 · 231 payments
- Education$108.24 · 2 payments
- Travel and Lodging$16.62 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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