Dr. Stewart B. Karr, MD

Dr. Karr practices at Johns Hopkins Howard County Medical Center in Columbia, Maryland, part of Johns Hopkins Health System.

Dr. Karr's NPI, 1477567022, was assigned on July 28, 2006. Dr. Karr graduated from New York University School of Medicine in 1986. Dr. Karr holds Maryland license D0035868.

Dr. Karr's primary practice is Johns Hopkins Howard County Medical Center, at 5755 Cedar Lane, Columbia, MD 21044 in Howard County. The practice phone is (410) 740-7890.

Dr. Karr's primary practice is Johns Hopkins Howard County Medical Center in Columbia, Maryland, part of Johns Hopkins Health System. Dr. Karr is also affiliated with The Johns Hopkins Hospital. The medical group on file is Johns Hopkins University. Dmand AI also links Dr. Karr to 1 more hospital, 3 group practices and clinics and 2 medical groups, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Karr practices, 6 sites in all. Vendor and product names are available with a free account.

Diagnostic radiology is Dr. Karr's primary specialty in the NPI Registry, under taxonomy code 2085R0202X. Dr. Karr is board certified in interventional radiology and diagnostic radiology by the American Board of Radiology. Dmand AI has Dr. Karr's licenses on file in 2 states: Maryland and District of Columbia.

CMS data shows 2,042 Medicare services from Dr. Karr across 38 procedure codes in 2024, for 1,458 Medicare patients. Medicare paid $59,161 for them. Every service was in a facility, such as a hospital, rather than an office.

CMS counts 1,458 Medicare patients who saw Dr. Karr in 2024. The largest group is 75 to 84, with 590 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 19% are also on Medicaid. Their average risk score is 2.02, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Karr's median patient age at 65, with 50% women.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Karr for performance year 2024, reported as part of a group. Dr. Karr accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Dmand AI links 1 paper to Dr. Karr. Dr. Karr's most frequent co-author is James M. Scanlon, MD.

CMS Open Payments shows 133 general payments to Dr. Karr from 28 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 57% of the total. Medtronic USA, Inc. paid the most, $1,350.

Dmand AI lists 5 awards for Dr. Karr, most recently Top Doctors:Baltimore Area in 2012.

Dr. Karr graduated from New York University School of Medicine in 1986. Dr. Karr is a member of SIR.

Dr. Karr is in network with 14 carriers, including United Healthcare, Elevance and Aetna. HMO plans come from the most carriers, 7. Check the plan with the practice before a visit.