Daniel J. Riordan, D.O.
Internal Medicine Physician · Muskego, WI
Daniel J. Riordan, D.O. is an internal medicine physician with a practice address in Muskego, Wisconsin, and NPI 1174545891, issued on Jul 24, 2006. Check the license (Wisconsin 49311, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Daniel J. Riordan
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 49311 WI
Self-reported in NPPES; status is on the state search - Practice location
- S69W15636 Janesville RD, Muskego, WI 53150
- Phone
- (262) 928-7000
- Enumerated
- Jul 24, 2006
- Record last updated
- Jan 29, 2025
- Fax
- (414) 422-2079
- Medicare enrollment
- Enrolled (PECOS I20060901000228); accepts Medicare assignment
- Medical or professional school
- At Still University Of Health Sciences, College Of Osteo Med, Kirksville, 2003
- Entity
- Type 1 · individual
Also registered at S69W15636 Janesville RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kristen Boyd, PAMedical Physician Assistant1891952503
- John Dyer, M.D.Pediatrics Physician1851364707
- Kyle Olson, PTPhysical Therapist1760953038
- Kristen Orlando, PTPhysical Therapist1902667298
- Jena RutherfordClinical Social Worker1124614433
- Laurie Whorley, APNPNurse Practitioner1609978196
Verify Daniel J. Riordan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 49311Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average internal medicine physician in 2024
7,826 Medicare Part D claims for 741 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. 127 claims were for opioids.
Most prescribed
- Atorvastatin Calcium529 claims
- Amlodipine Besylate372 claims
- Losartan Potassium367 claims
- Levothyroxine Sodium340 claims
- Pantoprazole Sodium227 claims
- Lisinopril215 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
- Prohealth Medical Group IncMuskego, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
6 internal medicine physician records list a practice address in Muskego
They are 6 of the 192 NPPES records with a practice address in Muskego, and 2,078 internal medicine physician records in Wisconsin.
All 6 in Muskego → All 2,078 in Wisconsin → Every provider in Muskego →
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 Daniel J. Riordan, D.O.'s NPI number?
Daniel J. Riordan, D.O.'s National Provider Identifier (NPI) is 1174545891, issued on Jul 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Daniel J. Riordan, D.O. located?
The NPPES record lists a practice address at S69W15636 Janesville RD, Muskego, WI, 53150. Phone: (262) 928-7000. Providers update this record themselves, so call before visiting.
How can I verify Daniel J. Riordan, D.O.'s license?
NPPES lists Wisconsin license number 49311, 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 Daniel J. Riordan, D.O. prescribe under Medicare Part D?
In 2024, Daniel J. Riordan, D.O. had 7,826 Medicare Part D claims for 741 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.