Brian Keegan Markhardt, MD
Diagnostic Radiology Physician · Madison, WI
Brian Keegan Markhardt, MD is a diagnostic radiology physician with a practice address in Madison, Wisconsin, and NPI 1154335420, issued on Jul 29, 2006. Check the license (Wisconsin 51213-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Brian Keegan Markhardt
- Credential
- MD
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License numbers
- 51213-020 WI
A 102863 CA
Self-reported in NPPES; status is on the state search - Practice location
- 600 Highland Ave, Madison, WI 53792
- Phone
- (608) 265-8231
- Enumerated
- Jul 29, 2006
- Record last updated
- Nov 17, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080811000394); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 2003
- Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 1,005 in Wisconsin → Look up another NPI →
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Verify Brian Keegan Markhardt in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 51213-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5 hospitals and group practices
- Richland HospitalRichland Center, WI · Critical Access Hospitals1 of 5 stars
- Fort Healthcare IncFort Atkinson, WI
- Group Health Cooperative OF South Central WisconsinMadison, WI
- University OF Wisconsin Medical Foundation IncMadison, WI
- University OF Wisconsin System Non PayrollMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Brian Keegan Markhardt among 1,005 diagnostic radiology physician records in Wisconsin
Brian Keegan Markhardt, MD is one of 1,005 diagnostic radiology physician records with a practice address in Wisconsin. 68% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 48% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2003 · median 2006 among the 664 with a school on file
- Record last updated2008 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
224 diagnostic radiology physician records list a practice address in Madison
They are 224 of the 15,014 NPPES records with a practice address in Madison, and 1,005 diagnostic radiology physician records in Wisconsin.
All 1,005 in Wisconsin → Every provider in Madison → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- Donna Blankenbaker, MDMadison, WI 537921558322065
- Ralph Colburn, MDMadison, WI 537921730169624
- Arthur Desmet, MDMadison, WI 537921912975830
- Louis Fischer, M.D.Madison, WI 537921265404800
- Thomas Grist, MDMadison, WI 537921841269859
- John Jerisha, MDMadison, WI 537921053389288
- Newrhee Kim, MDMadison, WI 537921952370256
- Janet Kuhlman, MDMadison, WI 537921669440673
Common questions
What is Brian Keegan Markhardt, MD's NPI number?
Brian Keegan Markhardt, MD's National Provider Identifier (NPI) is 1154335420, issued on Jul 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Brian Keegan Markhardt, MD located?
The NPPES record lists a practice address at 600 Highland Ave, Madison, WI, 53792. Phone: (608) 265-8231. Providers update this record themselves, so call before visiting.
How can I verify Brian Keegan Markhardt, MD's license?
NPPES lists Wisconsin license number 51213-020, 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.
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.