Alfredo Diaz, MD
Internal Medicine Physician · Two Rivers, WI
Alfredo Diaz, MD is an internal medicine physician with a practice address in Two Rivers, Wisconsin, and NPI 1902911159, issued on Aug 20, 2006. Check the license (Wisconsin 39841, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Alfredo Diaz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 39841 WI
3310 NE
Self-reported in NPPES; status is on the state search - Practice location
- 2219 Garfield St, Two Rivers, WI 54241
- Phone
- (920) 793-2281
- Enumerated
- Aug 20, 2006
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (920) 794-7553
- Medicaid ID
- 32468200 WI
- Medicare enrollment
- Enrolled (PECOS I20050214000901); may accept Medicare assignment
- Medical or professional school
- University Of Nebraska College Of Medicine, 1995
- Entity
- Type 1 · individual
Also registered at 2219 Garfield St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Madelyn Boney, NPNurse Practitioner1144006560
- John Christianson, NPNurse Practitioner1700612744
- Mary Gospodarek, APNPNurse Practitioner1386683563
- Julia Hester-Diaz, MDFamily Medicine Physician1386751998
- Samantha Klinkner, NPNurse Practitioner1942617220
- Janna Kroiss, D.O.Family Medicine Physician1063831022
Verify Alfredo Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 39841Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6.8 times the Medicare Part D claims of the average internal medicine physician in 2024
21,479 Medicare Part D claims for 1,219 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 80 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,632 claims
- Amlodipine Besylate906 claims
- Losartan Potassium852 claims
- Omeprazole677 claims
- Levothyroxine Sodium672 claims
- Lisinopril643 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 2 group practices
- Aamg Reach PLLCKenosha, WI
- Aurora Medical Group, Inc.Milwaukee, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
9 internal medicine physician records list a practice address in Two Rivers
They are 9 of the 251 NPPES records with a practice address in Two Rivers, and 2,078 internal medicine physician records in Wisconsin.
All 9 in Two Rivers → All 2,078 in Wisconsin → Every provider in Two Rivers →
Other internal medicine physician records in Wisconsin
- Sheetal Aatrai, MDMarshfield, WI1417568965
- Khalid Abdelgadir, MDManitowoc, WI1407433295
- Mesfin Abdissa, MDMilwaukee, WI1376579417
- Anas Abed, MDMadison, WI1659002566
- Margaret Abel, MDRhinelander, WI1477590487
- Mesfin Abera, M.D.Beaver Dam, WI1972852390
- Vidthya Abraham, M.D.Madison, WI1861836058
- Ismael Abu Limon, MDGreenfield, WI1467945543
- Amjed Abu Muhanna, MDMarinette, WI1861514135
- Satish Achanti, MDAppleton, WI1982711198
Common questions
What is Alfredo Diaz, MD's NPI number?
Alfredo Diaz, MD's National Provider Identifier (NPI) is 1902911159, issued on Aug 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Alfredo Diaz, MD located?
The NPPES record lists a practice address at 2219 Garfield St, Two Rivers, WI, 54241. Phone: (920) 793-2281. Providers update this record themselves, so call before visiting.
How can I verify Alfredo Diaz, MD's license?
NPPES lists Wisconsin license number 39841, 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 Alfredo Diaz, MD prescribe under Medicare Part D?
In 2024, Alfredo Diaz, MD had 21,479 Medicare Part D claims for 1,219 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.