Iain W. Decker, DO
Ophthalmology Physician · Beloit, WI
Iain W. Decker, DO is an ophthalmology physician with a practice address in Beloit, Wisconsin, and NPI 1740718410, issued on May 25, 2017. Check the license (Wisconsin 75511-21, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Iain W. Decker
- Credential
- DO
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- 75511-21 WI
036-157241 IL
5101028533 MI
Self-reported in NPPES; status is on the state search - Practice location
- Beloit Clinic, Beloit, WI 53511
- Phone
- (608) 364-2293
- Enumerated
- May 25, 2017
- Record last updated
- Mar 12, 2025
- Fax
- (608) 364-5452
- Medicaid ID
- 100174613 WI
- Medicare enrollment
- Enrolled (PECOS I20210730000446); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Osteopathic Medicine, 2017
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 441 in Wisconsin → Look up another NPI →
Also registered at Beloit Clinic
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rebecca Baumann, NPNurse Practitioner1508680539
- Brittany Blomberg, D.O.Family Medicine Physician1598125072
- Lynell Brown, AUDAudiologist1326002890
- Jennifer Cho-Escalante, DOFamily Medicine Physician1083142202
- Diane Clark, CDRegistered Dietitian1568055812
- Robert Derby, NPNurse Practitioner1104593060
Verify Iain W. Decker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 75511-21Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6% more Medicare Part D claims than the average ophthalmology physician in 2024
1,606 Medicare Part D claims for 366 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 31% of claims.
Most prescribed
- Latanoprost320 claims
- Prednisolone Acetate261 claims
- Ketorolac Tromethamine219 claims
- Ofloxacin203 claims
- Timolol Maleate139 claims
- Dorzolamide-Timolol106 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): 85 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: $222.53
8 payments; by number, the most common kind was food and beverage; the largest payer was Alcon Vision LLC. The 13,221 providers of this specialty with any payment received $4,535.02 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 2 group practices
- Beloit Health System IncBeloit, WI
- Blue Sky Vision Eye Care PCYpsilanti, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Iain W. Decker among 441 ophthalmology physician records in Wisconsin
Iain W. Decker, DO is one of 441 ophthalmology physician records with a practice address in Wisconsin. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 88% of them.
- NPI issued2017 · 88% of these records are older, 10% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2017 · median 2005 among the 259 with a school on file
- Record last updated2025 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Wisconsin
There are 441 ophthalmology physician records in Wisconsin.
All 441 in Wisconsin → Every provider in Beloit → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Michal Gutowski, MDBeloit, WI 535111730613621
- Mario Rojas, MDBeloit, WI 535111326151002
- Alice Townshend, MDBeloit, WI 535111437169752
- Daniel Fary, M.D.Fort Atkinson, WI 535381760406862
- Catherine Lee, M.D.Fort Atkinson, WI 535381689698326
- John Bussa, MDJanesville, WI 535461972612661
- John Downing, MDJanesville, WI 535461235170374
- Anne Kilby, M.D.Janesville, WI 535461144265729
Common questions
What is Iain W. Decker, DO's NPI number?
Iain W. Decker, DO's National Provider Identifier (NPI) is 1740718410, issued on May 25, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Iain W. Decker, DO located?
The NPPES record lists a practice address at Beloit Clinic, Beloit, WI, 53511. Phone: (608) 364-2293. Providers update this record themselves, so call before visiting.
How can I verify Iain W. Decker, DO's license?
NPPES lists Wisconsin license number 75511-21, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Iain W. Decker, DO prescribe under Medicare Part D?
In 2024, Iain W. Decker, DO had 1,606 Medicare Part D claims for 366 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Iain W. Decker, DO's MIPS final score?
The 2023 MIPS final score is 85 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.