Winston Douglas Chamberlain, MD, PHD
Cornea and External Diseases Specialist Physician · Portland, OR
Winston Douglas Chamberlain, MD, PHD is a cornea and external diseases specialist physician with a practice address in Portland, Oregon, and NPI 1710108162, issued on May 2, 2007. Check the license (Oregon MD28180, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Winston Douglas Chamberlain
- Credential
- MD, PHD
- Primary taxonomy
- Cornea and External Diseases Specialist Physician 207WX0120X
- License numbers
- MD28180 OR
A89422 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3375 SW Terwilliger Blvd, Portland, OR 97239
- Phone
- (503) 494-3000
- Enumerated
- May 2, 2007
- Record last updated
- Apr 9, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (503) 494-4286
- Medicare enrollment
- Enrolled (PECOS I20080708000272); accepts Medicare assignment
- Medical or professional school
- University Of Colorado School Of Medicine, Denver, 2002
- Entity
- Type 1 · individual
8 nearest cornea and external diseases specialist physician records → All 10 in Oregon → Look up another NPI →
Also registered at 3375 SW Terwilliger Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Daniel Albert, MDOphthalmology Physician1801862388
- Kavita Bhavsar, MDRetina Specialist (Ophthalmology) Physician1720216765
- Kristin Biggee, M.D.Ophthalmology Physician1376719591
- Amanda Burr, MS, CGCGenetic Counselor (M.S.)1770013252
- Mauricio Cabezas, M.D.Ophthalmology Physician1295970424
Verify Winston Douglas Chamberlain in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD28180Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% fewer Medicare Part D claims than the average cornea and external diseases specialist physician in 2024
1,124 Medicare Part D claims for 300 beneficiaries, against an average of 1,263 among the 330 providers of this specialty who prescribed in Part D. Brand-name drugs were 48% of claims.
Most prescribed
- Prednisolone Acetate270 claims
- Fluorometholone139 claims
- Ofloxacin70 claims
- Timolol Maleate54 claims
- Restasis50 claims
- Valacyclovir46 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 97.8 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $5,081.31
4 payments; by number, the most common kind was consulting fee; the largest payer was Abbvie Inc. The 284 providers of this specialty with any payment received $3,109.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Kaiser Foundation Health Plan OF The NorthwestClackamas, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Winston Douglas Chamberlain among 10 cornea and external diseases specialist physician records in Oregon
Winston Douglas Chamberlain, MD, PHD is one of 10 cornea and external diseases specialist physician records with a practice address in Oregon. 100% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 20% of them.
- NPI issued2007 · 20% of these records are older, 50% newer
- In a Medicare fileYes · 100% of these records are
- In the CMS Doctors and Clinicians fileYes · 100% of these records are
- Graduated2002 · median 2006 among the 10 with a school on file
- Record last updated2018 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207WX0120X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cornea and External Diseases Specialist Physician providers in Oregon
There are 10 cornea and external diseases specialist physician records in Oregon.
All 10 in Oregon → Every provider in Portland → Cornea and External Diseases Specialist Physician nationwide →
The 8 cornea and external diseases specialist physician records with the nearest ZIP codes
- John Clements, MDPortland, OR 972391700907516
- Afshan Nanji, M.D.Portland, OR 972391134381718
- Roma Pegany, MDPortland, OR 972391194215319
- David Demill, M.D.Portland, OR 972101366783631
- Ashlin JoyePortland, OR 972101629531116
- Michael Straiko, M.D.Portland, OR 972101013127075
- Mark Terry, MDPortland, OR 972101760498737
- Matthew Oliva, MDMedford, OR 975041750450573
Common questions
What is Winston Douglas Chamberlain, MD, PHD's NPI number?
Winston Douglas Chamberlain, MD, PHD's National Provider Identifier (NPI) is 1710108162, issued on May 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Winston Douglas Chamberlain, MD, PHD located?
The NPPES record lists a practice address at 3375 SW Terwilliger Blvd, Portland, OR, 97239. Phone: (503) 494-3000. Providers update this record themselves, so call before visiting.
How can I verify Winston Douglas Chamberlain, MD, PHD's license?
NPPES lists Oregon license number MD28180, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Winston Douglas Chamberlain, MD, PHD prescribe under Medicare Part D?
In 2024, Winston Douglas Chamberlain, MD, PHD had 1,124 Medicare Part D claims for 300 beneficiaries; the average among cornea and external diseases specialist physician prescribers was 1,263. Part D covers Medicare prescriptions only.
What is Winston Douglas Chamberlain, MD, PHD's MIPS final score?
The 2023 MIPS final score is 97.8 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.