William Wen-Long Yang, MD
NPI 1790979011ActiveIndividual· Ophthalmology· Springfield, IL
Ophthalmology (MD) in Springfield, Illinois, trained at University of Wisconsin School of Medicine (class of 2004). Their prescriptions cost Medicare Part D more than their services did: $729,962 for 1,667 claims, against $114,790 paid for services in 2024. Vifor Pharma, Inc. was the largest of 8 companies reporting payments in 2025, $5,951 in all, mostly speaking and faculty fees.
Overview
| NPI | 1790979011 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 29, 2007 |
| Last updated in NPPES | Feb 22, 2026 |
| Certified by provider | Feb 22, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | 036126329 | IL |
| Ophthalmology | 207W00000X | 70002214 | WA |
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 - Ophthalmology (IL); Practitioner - Ophthalmology (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 389 |
|---|---|
| Services billed | 841 across 22 procedure codes |
| Paid by Medicare | $114,790 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,667 · 2,259 30-day fills |
|---|---|
| Patients | 397 |
| Total drug cost | $729,962 |
| Generic share | 51% of claims |
Education and affiliations
| Medical school | University of Wisconsin School of Medicine |
|---|---|
| Graduation year | 2004 |
| Medicare specialty | Ophthalmology |
Medical groups
- Prairie Eye Center, LtdSpringfield, IL · 17 clinicians
- Andrew S Edwards MD PLLCWalla Walla, WA · 3 clinicians
Hospital affiliations
- Providence St Mary Medical CenterWalla Walla, WA
- St Johns HospitalSpringfield, IL
Industry payments (Open Payments)
- 2025$5,951 · 20 payments from 8 companies
- 2024$2,386 · 16 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vifor Pharma, Inc. | $5,504 | 5 |
| Tarsus Pharmaceuticals, Inc. | $220.43 | 5 |
| Bausch & Lomb Americas Inc. | $97.16 | 5 |
| Glaukos Corporation | $40.07 | 1 |
| Astellas Pharma US Inc | $31.48 | 1 |
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$5,445 · 3 payments
- Food and Beverage$506.45 · 17 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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