Winston Douglas Chamberlain, MD, PHD
NPI 1710108162ActiveIndividual· Ophthalmology, Cornea and External Diseases Specialist· Portland, OR
Ophthalmology, Cornea and External Diseases Specialist (MD, PHD) in Portland, Oregon, trained at University of Colorado School of Medicine, Denver (class of 2002). Their prescriptions cost Medicare Part D more than their services did: $273,112 for 1,124 claims, against $87,477 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 3 companies reporting payments in 2025, $15,690 in all, mostly consulting fees.
Overview
| NPI | 1710108162 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD, PHD |
| Sole proprietor | No |
| NPI issued | May 2, 2007 |
| Last updated in NPPES | Apr 9, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology, Cornea and External Diseases Specialist Primary | 207WX0120X | MD28180 | OR |
| Ophthalmology | 207W00000X | MD28180 | OR |
| Ophthalmology | 207W00000X | A89422 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Ophthalmology (OR); Practitioner - Ophthalmology (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 333 |
|---|---|
| Services billed | 967 across 53 procedure codes |
| Paid by Medicare | $87,477 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,124 · 1,809 30-day fills |
|---|---|
| Patients | 300 |
| Total drug cost | $273,112 |
| Generic share | 52% of claims |
Education and affiliations
| Medical school | University of Colorado School of Medicine, Denver |
|---|---|
| Graduation year | 2002 |
| Medicare specialty | Ophthalmology |
Medical group
- Kaiser Foundation Health Plan of the NorthwestSalem, OR · 1,807 clinicians
Industry payments (Open Payments)
- 2025$15,690 · 4 payments from 3 companies
- 2024$5,081 · 4 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $11,900 | 1 |
| Abbvie Inc. | $3,648 | 2 |
| Oyster Point Pharma, Inc. | $142.59 | 1 |
What the 2025 payments were for
- Consulting Fee$15,400 · 2 payments
- Food and Beverage$290.20 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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