Yan Guo
NPI 1184816696ActiveIndividual· Ophthalmology· Marshfield, WI
Ophthalmology with Riverside Physician Services Inc, practicing in Marshfield, Wisconsin. In 2024 Medicare paid $331,262 for 1,213 patients, and Part D covered 3,646 of their prescriptions, 75% of them generic. Abbvie Inc. was the largest of 9 companies reporting payments in 2025, $350.53 in all, mostly food and beverage. Lists Riverside Regional Medical Center as a hospital affiliation.
Overview
| NPI | 1184816696 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | No |
| NPI issued | Aug 17, 2007 |
| Last updated in NPPES | Jun 16, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | 54774-020 | WI |
| Student in an Organized Health Care Education/Training Program | 390200000X | 20007 | MN |
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 (VA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,213 |
|---|---|
| Services billed | 4,182 across 35 procedure codes |
| Paid by Medicare | $331,262 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,646 · 6,621 30-day fills |
|---|---|
| Patients | 638 |
| Total drug cost | $269,521 |
| Generic share | 75% of claims |
Education and affiliations
| Graduation year | 1991 |
|---|---|
| Medicare specialty | Ophthalmology |
Medical group
- Riverside Physician Services IncWilliamsburg, VA · 797 clinicians
Hospital affiliation
- Riverside Regional Medical CenterNewport News, VA
Industry payments (Open Payments)
- 2025$350.53 · 15 payments from 9 companies
- 2024$384.54 · 14 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $107.04 | 4 |
| Alcon Vision LLC | $65.72 | 3 |
| Sun Pharmaceutical Industries Inc. | $44.65 | 2 |
| Harrow Eye, LLC | $25.51 | 1 |
| Thea Pharma Inc. | $24.23 | 1 |
What the 2025 payments were for
- Food and Beverage$350.53 · 15 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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