Aaron R. Johnson, M.D.
Urology Physician · Fond Du Lac, WI
Aaron R. Johnson, M.D. is a urology physician with a practice address in Fond Du Lac, Wisconsin, and NPI 1538124854, issued on Apr 19, 2006. Check the license (Wisconsin 48454, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Aaron R. Johnson
- Credential
- M.D.
- Primary taxonomy
- Urology Physician 208800000X
- License number
- 48454 WI
Self-reported in NPPES; status is on the state search - Practice location
- 420 E Division St, Fond Du Lac, WI 54935
- Phone
- (920) 926-8495
- Enumerated
- Apr 19, 2006
- Record last updated
- Feb 29, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicaid ID
- 34943200 WI
- Medicare enrollment
- Enrolled (PECOS I20070928000072); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 2000
- Entity
- Type 1 · individual
8 nearest urology physician records → All 259 in Wisconsin → Look up another NPI →
Also registered at 420 E Division St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elizabeth Berenz, FNP-BCFamily Nurse Practitioner1619386885
- Melissa Berggren, PA-CPhysician Assistant1639377617
- Louann Biddick, NPNurse Practitioner1770566721
- Jennifer Bissell, MDFamily Medicine Physician1316146962
- Tiffany Boelk, APNPNurse Practitioner1700459690
- David Bowman, M.D.Cardiovascular Disease Physician1962492397
Verify Aaron R. Johnson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 48454Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average urology physician in 2024
3,820 Medicare Part D claims for 608 beneficiaries, against an average of 1,340 among the 10,782 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims. 75 claims were for opioids.
Most prescribed
- Tamsulosin Hcl1,250 claims
- Dutasteride481 claims
- Oxybutynin Chloride Er333 claims
- Cephalexin232 claims
- Finasteride129 claims
- Silodosin118 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.
Industry payments in 2024: $39.35
2 payments; by number, the most common kind was food and beverage; the largest payer was Urogen Pharma, Inc. The 9,340 providers of this specialty with any payment received $3,800.04 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
- Agnesian Healthcare IncMayville, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Aaron R. Johnson among 259 urology physician records in Wisconsin
Aaron R. Johnson, M.D. is one of 259 urology physician records with a practice address in Wisconsin. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 14% of them.
- NPI issued2006 · 14% of these records are older, 43% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2000 · median 2002 among the 166 with a school on file
- Record last updated2016 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208800000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Urology Physician providers in Wisconsin
There are 259 urology physician records in Wisconsin.
All 259 in Wisconsin → Every provider in Fond Du Lac → Urology Physician nationwide →
The 8 urology physician records with the nearest ZIP codes
- James Cauley, MDFond Du Lac, WI 549351316931173
- Sean Hedican, MDFond Du Lac, WI 549351043274699
- Erin SalterFond Du Lac, WI 549351851754287
- Christopher Tuveson, MDFond Du Lac, WI 549351023091386
- James Wright, MDFond Du Lac, WI 549351740273390
- Andrew Maes, D.O.Berlin, WI 549231841496619
- Frank Chybowski, MDAppleton, WI 549151487648242
- Ronald Slovick, MDAppleton, WI 549151932163524
Common questions
What is Aaron R. Johnson, M.D.'s NPI number?
Aaron R. Johnson, M.D.'s National Provider Identifier (NPI) is 1538124854, issued on Apr 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Aaron R. Johnson, M.D. located?
The NPPES record lists a practice address at 420 E Division St, Fond Du Lac, WI, 54935. Phone: (920) 926-8495. Providers update this record themselves, so call before visiting.
How can I verify Aaron R. Johnson, M.D.'s license?
NPPES lists Wisconsin license number 48454, 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 Aaron R. Johnson, M.D. prescribe under Medicare Part D?
In 2024, Aaron R. Johnson, M.D. had 3,820 Medicare Part D claims for 608 beneficiaries; the average among urology physician prescribers was 1,340. 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.
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.