Joseph Koo
Emergency Medicine Physician · Winona, MN
Joseph Koo is an emergency medicine physician with a practice address in Winona, Minnesota, and NPI 1851616791, issued on Apr 4, 2010. Check the license (Minnesota 56356, as entered in NPPES) on the Minnesota Board of Medical Practice; the Medicare figures below come from public CMS files.
- Name
- Joseph Koo
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 56356 MN
Self-reported in NPPES; status is on the state search - Practice location
- 855 Mankato Ave, Winona, MN 55987
- Phone
- (507) 454-3650
- Enumerated
- Apr 4, 2010
- Record last updated
- Jul 18, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20130603000048); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,348 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.
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- Emily Beckel, ATCAthletic Trainer1659890481
- Everett Beguin, MDFamily Medicine Physician1134139652
Verify Joseph Koo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMinnesota Board of Medical Practice
Search for license 56356Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% fewer Medicare Part D claims than the average emergency medicine physician in 2024
173 Medicare Part D claims for 125 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 27 claims were for opioids.
Most prescribed
- Prednisone21 claims
- Azithromycin17 claims
- Oxycodone Hcl15 claims
- Tramadol Hcl11 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.
Joseph Koo among 1,348 emergency medicine physician records in Minnesota
Joseph Koo is one of 1,348 emergency medicine physician records with a practice address in Minnesota. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 54% of them.
- NPI issued2010 · 54% of these records are older, 43% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2010 · median 2012 among the 818 with a school on file
- Record last updated2013 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Minnesota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 emergency medicine physician records list a practice address in Winona
They are 7 of the 876 NPPES records with a practice address in Winona, and 1,348 emergency medicine physician records in Minnesota.
All 1,348 in Minnesota → Every provider in Winona → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Bethany Corliss Da Rocha, M.D.Winona, MN 559871659670016
- Marc Dummit, MDWinona, MN 559871083631584
- Charles Kooiker, DOWinona, MN 559871477092948
- Carlos Morales, MDWinona, MN 559871306863808
- Christopher Schubert, MDWinona, MN 559871396830527
- Christopher WatrasWinona, MN 559871366708927
- Luke HellandWabasha, MN 559811457617193
- Kent Jeffery, MDWabasha, MN 559811528020625
Common questions
What is Joseph Koo's NPI number?
Joseph Koo's National Provider Identifier (NPI) is 1851616791, issued on Apr 4, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Koo 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 Joseph Koo's license?
NPPES lists Minnesota license number 56356, 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 Joseph Koo prescribe under Medicare Part D?
In 2024, Joseph Koo had 173 Medicare Part D claims for 125 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.