NPPES file of Aug 9, 2026

Benjamin John Ernst, M.D.

Retina Specialist (Ophthalmology) Physician · Appleton, WI

Benjamin John Ernst, M.D. is a retina specialist (ophthalmology) physician with a practice address in Appleton, Wisconsin, and NPI 1518162247, issued on Jun 21, 2007. Check the license (Wisconsin 57459020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1518162247
Name
Benjamin John Ernst
Credential
M.D.
Primary taxonomy
Retina Specialist (Ophthalmology) Physician 207WX0107X
License numbers
57459020 WI
48790 CO
Self-reported in NPPES; status is on the state search
Practice location
442 N Westhill Blvd Ste A, Appleton, WI 54914
Phone
(920) 751-8666
Enumerated
Jun 21, 2007
Record last updated
Sep 21, 2023
Medicare enrollment
Enrolled (PECOS I20120824000125); accepts Medicare assignment
Medical or professional school
Saint Louis University School Of Medicine, 2006
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 442 N Westhill Blvd Ste A

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Anthony Parendo, M.D.Retina Specialist (Ophthalmology) Physician1043690233
  2. Michael Possin, M.D.Retina Specialist (Ophthalmology) Physician1811253289

Verify Benjamin John Ernst in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 57459020    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Wisconsin license search

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80% fewer Medicare Part D claims than the average retina specialist (ophthalmology) physician in 2024

122 Medicare Part D claims for 48 beneficiaries, against an average of 620 among the 1,449 providers of this specialty who prescribed in Part D. Brand-name drugs were 48% of claims.

  1. Benjamin Ernst122
  2. Specialty average620

Most prescribed

  1. Prednisolone Acetate39 claims
  2. Ketorolac Tromethamine22 claims
  3. Latanoprost13 claims
  4. Timolol Maleate13 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.

Bills Medicare through one group practice

  1. Northeast Wisconsin Retina Associates SCGreen Bay, WI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Retina Specialist (Ophthalmology) Physician providers in Wisconsin

There are 27 retina specialist (ophthalmology) physician records in Wisconsin.

All 27 in Wisconsin → Every provider in Appleton →

Other retina specialist (ophthalmology) physician records in Wisconsin

  1. Olufemi Adams, MDGreenfield, WI1235792946
  2. Jennifer Adeghate, MD, PHDMilwaukee, WI1437655891
  3. Joshua Agranat, MDGreenfield, WI1639533888
  4. Paige Arthur, MDMadison, WI1497240717
  5. Rajeev Buddi, MDNeenah, WI1700819281
  6. Razek Georges Coussa, MDCM, MPHIL, MENGMilwaukee, WI1700362522
  7. Kevin Elwood, MDMilwaukee, WI1083243802
  8. Charles Hejny, MDNeenah, WI1922013671
  9. Jonathan Hershey, M.D.Milwaukee, WI1811992563
  10. Khalid Kahook, M.D.,Neenah, WI1356640726

Common questions

What is Benjamin John Ernst, M.D.'s NPI number?

Benjamin John Ernst, M.D.'s National Provider Identifier (NPI) is 1518162247, issued on Jun 21, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Benjamin John Ernst, M.D. located?

The NPPES record lists a practice address at 442 N Westhill Blvd Ste A, Appleton, WI, 54914. Phone: (920) 751-8666. Providers update this record themselves, so call before visiting.

How can I verify Benjamin John Ernst, M.D.'s license?

NPPES lists Wisconsin license number 57459020, 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 Benjamin John Ernst, M.D. prescribe under Medicare Part D?

In 2024, Benjamin John Ernst, M.D. had 122 Medicare Part D claims for 48 beneficiaries; the average among retina specialist (ophthalmology) physician prescribers was 620. Part D covers Medicare prescriptions only.

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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.