NPPES file of Aug 9, 2026

Juan F. Diaz, M.D.

Interventional Cardiology Physician · Fond Du Lac, WI

Juan F. Diaz, M.D. is an interventional cardiology physician with a practice address in Fond Du Lac, Wisconsin, and NPI 1780793737, issued on Aug 30, 2006. Check the license (Wisconsin 41345, 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
1780793737
Name
Juan F. Diaz
Credential
M.D.
Primary taxonomy
Interventional Cardiology Physician 207RI0011X
License number
41345 WI
Self-reported in NPPES; status is on the state search
Practice location
420 E Division St, Fond Du Lac, WI 54935
Phone
(920) 926-8230
Enumerated
Aug 30, 2006
Record last updated
Dec 23, 2020 (not updated in 6 years: call before relying on the address or phone)
Medicaid ID
32603400 WI
Medicare enrollment
Enrolled (PECOS I20071115000210); accepts Medicare assignment
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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8 nearest interventional cardiology physician records → All 129 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.

  1. Elizabeth Berenz, FNP-BCFamily Nurse Practitioner1619386885
  2. Melissa Berggren, PA-CPhysician Assistant1639377617
  3. Louann Biddick, NPNurse Practitioner1770566721
  4. Jennifer Bissell, MDFamily Medicine Physician1316146962
  5. Tiffany Boelk, APNPNurse Practitioner1700459690
  6. David Bowman, M.D.Cardiovascular Disease Physician1962492397

Verify Juan F. Diaz in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 41345    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

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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44% more Medicare Part D claims than the average interventional cardiology physician in 2024

4,580 Medicare Part D claims for 795 beneficiaries, against an average of 3,179 among the 6,605 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.

  1. Juan Diaz4,580
  2. Specialty average3,179

Most prescribed

  1. Atorvastatin Calcium490 claims
  2. Metoprolol Succinate388 claims
  3. Clopidogrel367 claims
  4. Rosuvastatin Calcium337 claims
  5. Losartan Potassium321 claims
  6. Lisinopril227 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: $101.44

5 payments; by number, the most common kind was food and beverage; the largest payer was Abiomed. The 6,394 providers of this specialty with any payment received $7,062.29 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Juan Diaz$101.44
  2. Specialty average$7,062.29

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

  1. Agnesian Healthcare IncFond Du Lac, WI

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

Juan F. Diaz among 129 interventional cardiology physician records in Wisconsin

Juan F. Diaz, M.D. is one of 129 interventional cardiology physician records with a practice address in Wisconsin. 92% 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 5% of them.

  • NPI issued2006 · 5% of these records are older, 44% newer
  • In a Medicare fileYes · 92% of these records are
  • In the CMS Doctors and Clinicians fileYes · 86% of these records are
  • Graduated1982 · median 1998 among the 111 with a school on file
  • Record last updated2020 · 42% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0011X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Interventional Cardiology Physician providers in Wisconsin

There are 129 interventional cardiology physician records in Wisconsin.

All 129 in Wisconsin → Every provider in Fond Du Lac → Interventional Cardiology Physician nationwide →

The 8 interventional cardiology physician records with the nearest ZIP codes

  1. Peter Ackell, MDAppleton, WI 549131710937115
  2. Brian Guttormsen, MDAppleton, WI 549131629045232
  3. Douglas Mielke, MDAppleton, WI 549131104878149
  4. Thomas Tamlyn, MDAppleton, WI 549131831176338
  5. Abdallah Malkawi, MDAppleton, WI 549111124505730
  6. Cherian Varghese, M.D.Appleton, WI 549111689870370
  7. Kingston Okrah, MDOshkosh, WI 549041528222312
  8. Qais Radaideh, M.D.Oshkosh, WI 549041063829844

Common questions

What is Juan F. Diaz, M.D.'s NPI number?

Juan F. Diaz, M.D.'s National Provider Identifier (NPI) is 1780793737, issued on Aug 30, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Juan F. Diaz, M.D. located?

The NPPES record lists a practice address at 420 E Division St, Fond Du Lac, WI, 54935. Phone: (920) 926-8230. Providers update this record themselves, so call before visiting.

How can I verify Juan F. Diaz, M.D.'s license?

NPPES lists Wisconsin license number 41345, 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 Juan F. Diaz, M.D. prescribe under Medicare Part D?

In 2024, Juan F. Diaz, M.D. had 4,580 Medicare Part D claims for 795 beneficiaries; the average among interventional cardiology physician prescribers was 3,179. 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.