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
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
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).
Alfredo Diaz among 2,078 internal medicine physician records in Wisconsin
Alfredo Diaz, MD is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% 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 9% of them.
- NPI issued2006 · 9% of these records are older, 46% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1995 · median 2002 among the 1,098 with a school on file
- Record last updated2021 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (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 2,078 in Wisconsin → Every provider in Two Rivers → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Dale Asche, M.D.Two Rivers, WI 542411619116878
- Samuel Ballard, DOTwo Rivers, WI 542411578191763
- Emil Pajek, M.D.Two Rivers, WI 542411033140462
- Neil Patterson, DOTwo Rivers, WI 542411760123616
- Tresa Teehan, MDTwo Rivers, WI 542411144337247
- Cedric Thayer, MDTwo Rivers, WI 542411043327158
- Richard Theobald, MDTwo Rivers, WI 542411952418063
- Shanti Timilsina, MDTwo Rivers, WI 542411669051736
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.