Karen M. Loomans, MD
Internal Medicine Physician · Waunakee, WI
Karen M. Loomans, MD is an internal medicine physician with a practice address in Waunakee, Wisconsin, and NPI 1649246596, issued on Feb 28, 2006. Check the license (Wisconsin 31274, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Karen M. Loomans
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 31274 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1603 Charleston Cir, Waunakee, WI 53597
- Phone
- (608) 265-7550
- Enumerated
- Feb 28, 2006
- Record last updated
- Oct 3, 2025
- Medicare enrollment
- Enrolled (PECOS I20100607000273); may accept Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 1989
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Verify Karen M. Loomans in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 31274Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average internal medicine physician in 2024
304 Medicare Part D claims for 206 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 21 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass23 claims
- Doxycycline Hyclate21 claims
- Amlodipine Besylate18 claims
- Naproxen15 claims
- Azithromycin13 claims
- Cephalexin13 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.
Karen M. Loomans among 2,078 internal medicine physician records in Wisconsin
Karen M. Loomans, 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
- Graduated1989 · median 2002 among the 1,098 with a school on file
- Record last updated2025 · 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).
Internal Medicine Physician providers in Wisconsin
There are 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Waunakee → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Barbara Stowe-Carpenter, MDVerona, WI 535931528029907
- Bruce Baranski, M.D.Sun Prairie, WI 535901750323549
- Keith Cooper, DOSun Prairie, WI 535901477505063
- Gregory Motl, MDSun Prairie, WI 535901548216013
- Michele Newquist, MDSun Prairie, WI 535901376598631
- Kevin Chanil Park, M.D.Sun Prairie, WI 535901962437053
- Jodi Punke, DOSun Prairie, WI 535901225148471
- Leo Schug, MDSun Prairie, WI 535901053350520
Common questions
What is Karen M. Loomans, MD's NPI number?
Karen M. Loomans, MD's National Provider Identifier (NPI) is 1649246596, issued on Feb 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karen M. Loomans, MD located?
The NPPES record lists a practice address at 1603 Charleston Cir, Waunakee, WI, 53597. Phone: (608) 265-7550. Providers update this record themselves, so call before visiting.
How can I verify Karen M. Loomans, MD's license?
NPPES lists Wisconsin license number 31274, 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 Karen M. Loomans, MD prescribe under Medicare Part D?
In 2024, Karen M. Loomans, MD had 304 Medicare Part D claims for 206 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.