Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Brian Keegan Markhardt, MD

Diagnostic Radiology Physician in Madison, WI · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1154335420

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Registry record

Entity type Individual (Type 1)

Name Dr. Brian Keegan Markhardt

Credential MD

Sex Male

Practice address Madison, WI, 53792

Phone (608) 265-8231

Enumeration date Jul 29, 2006

Last updated in NPPES Nov 17, 2008

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License A 102863 (CA) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 51213-020 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Brian Markhardt?

The National Provider Identifier (NPI) for Brian Markhardt is 1154335420, a Type 1 (individual) record in the CMS NPPES registry.

Where does Brian Markhardt practice?

The practice location on file with NPPES is in Madison, WI. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Christina Morganti Orthopaedic Surgery Physician · Madison, WI NPI 1245232420 Janet Robillard Medical Physician Assistant · Madison, WI NPI 1659375046 Chris Konstantinou Cardiovascular Disease Physician · Madison, WI NPI 1346246162 Susan Rebsamen Neuroradiology Physician · Madison, WI NPI 1871590422 Dan Gralnek Urology Physician · Madison, WI NPI 1811995319 Yonker Wang Diagnostic Radiology Physician · Madison, WI NPI 1033117494 Frederick Heiden Anesthesiology Physician · Madison, WI NPI 1982603957 Dawn Ledbetter Anesthesiology Physician · Madison, WI NPI 1750381323

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-11-17.