Katrina Ruth Hammel, M.D.
Internal Medicine Physician · Winona, MN
Katrina Ruth Hammel, M.D. is an internal medicine physician with a practice address in Winona, Minnesota, and NPI 1780894527, issued on May 23, 2007. Check the license (Minnesota 55911, as entered in NPPES) on the Minnesota Board of Medical Practice; the Medicare figures below come from public CMS files.
- Name
- Katrina Ruth Hammel
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 55911 MN
37932 IA
54557 WI
Self-reported in NPPES; status is on the state search - Practice location
- 855 Mankato Ave, Winona, MN 55987
- Phone
- (507) 454-3650
- Enumerated
- May 23, 2007
- Record last updated
- Feb 6, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20130220000416); accepts Medicare assignment
- Medical or professional school
- University Of Iowa, Rj & L Carver College Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,632 in Minnesota → Look up another NPI →
Also registered at 855 Mankato Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael Adix, OTROccupational Therapist1265006084
- Kirsten Allen, MS, ATC, CESAthletic Trainer1235805813
- Ryan BartolPhysician Assistant1356299945
- Nicole Beatty, MDAnesthesiology Physician1982657607
- Emily Beckel, ATCAthletic Trainer1659890481
- Everett Beguin, MDFamily Medicine Physician1134139652
Verify Katrina Ruth Hammel in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMinnesota Board of Medical Practice
Search for license 55911Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.4 times the Medicare Part D claims of the average internal medicine physician in 2024
17,222 Medicare Part D claims for 941 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 577 claims were for opioids.
Most prescribed
- Atorvastatin Calcium858 claims
- Omeprazole617 claims
- Metoprolol Succinate613 claims
- Levothyroxine Sodium595 claims
- Amlodipine Besylate554 claims
- Losartan Potassium516 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.
One hospital affiliation
- Winona Health ServicesWinona, MN · Acute Care Hospitals2 of 5 stars
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.
Katrina Ruth Hammel among 2,632 internal medicine physician records in Minnesota
Katrina Ruth Hammel, M.D. is one of 2,632 internal medicine physician records with a practice address in Minnesota. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 42% of them.
- NPI issued2007 · 42% of these records are older, 52% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2005 · median 2008 among the 1,700 with a school on file
- Record last updated2013 · 57% 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 Minnesota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 internal medicine physician records list a practice address in Winona
They are 11 of the 876 NPPES records with a practice address in Winona, and 2,632 internal medicine physician records in Minnesota.
All 2,632 in Minnesota → Every provider in Winona → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Horace Andersen, MN 18091Winona, MN 559871659510659
- Andrew Edin, MDWinona, MN 559871053428508
- Arnold Fenske, MDWinona, MN 559871831109495
- Richard Ferris, MDWinona, MN 559871245347780
- Joseph Kaiya, MDWinona, MN 559871134550544
- John Mulrooney, MDWinona, MN 559871275543829
- Robert Neilson, M.D.Winona, MN 559871952390338
- Dennis Nolan, MDWinona, MN 559871619987278
Common questions
What is Katrina Ruth Hammel, M.D.'s NPI number?
Katrina Ruth Hammel, M.D.'s National Provider Identifier (NPI) is 1780894527, issued on May 23, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Katrina Ruth Hammel, M.D. located?
The NPPES record lists a practice address at 855 Mankato Ave, Winona, MN, 55987. Phone: (507) 454-3650. Providers update this record themselves, so call before visiting.
How can I verify Katrina Ruth Hammel, M.D.'s license?
NPPES lists Minnesota license number 55911, as entered by the provider. Search the Minnesota Board of Medical Practice at https://mn.gov/boards/medical-practice/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katrina Ruth Hammel, M.D. prescribe under Medicare Part D?
In 2024, Katrina Ruth Hammel, M.D. had 17,222 Medicare Part D claims for 941 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.