William John Blosky, M.D.
Gastroenterology Physician · Milwaukee, WI
William John Blosky, M.D. is a gastroenterology physician with a practice address in Milwaukee, Wisconsin, and NPI 1740506195, issued on Apr 9, 2010. Check the license (Wisconsin 65262-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- William John Blosky
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 65262-20 WI
121652 OH
Self-reported in NPPES; status is on the state search - Practice location
- 2801 W Kinnickinnic River Pkwy Ste 1080, Milwaukee, WI 53215
- Phone
- (414) 908-6506
- Enumerated
- Apr 9, 2010
- Record last updated
- Jan 26, 2026
- Fax
- (414) 908-6510
- Medicare enrollment
- Enrolled (PECOS I20160808002300); may accept Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 2010
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 340 in Wisconsin → Look up another NPI →
Also registered at 2801 W Kinnickinnic River Pkwy Ste 1080
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alison Baierl, PA-CMedical Physician Assistant1831530575
- Katie Balderas, PA-CPhysician Assistant1497184279
- Aaron Baltz, MDGastroenterology Physician1467499277
- Fabiola Boche, PA-CMedical Physician Assistant1265661847
- Tedd Cain, MDGastroenterology Physician1750358115
- David Carron, MDGastroenterology Physician1023085487
Verify William John Blosky in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 65262-20Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.0 times the Medicare Part D claims of the average gastroenterology physician in 2024
1,625 Medicare Part D claims for 679 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims.
Most prescribed
- Pantoprazole Sodium409 claims
- Omeprazole222 claims
- Sod Sulf-Potass Sulf-Mag Sulf178 claims
- Gavilyte-G167 claims
- Peg-3350 And Electrolytes68 claims
- Budesonide Dr62 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.
Bills Medicare through 3 group practices
- Gastroenterology Specialists SCWauwatosa, WI
- GI Associates LLCMilwaukee, WI
- Milwaukee GI Specialists SCWauwatosa, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William John Blosky among 340 gastroenterology physician records in Wisconsin
William John Blosky, M.D. is one of 340 gastroenterology physician records with a practice address in Wisconsin. 83% 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 70% of them.
- NPI issued2010 · 70% of these records are older, 28% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2010 · median 2003 among the 239 with a school on file
- Record last updated2026 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Wisconsin
There are 340 gastroenterology physician records in Wisconsin.
All 340 in Wisconsin → Every provider in Milwaukee → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Cristino Canga, MDMilwaukee, WI 532151588631253
- David Carron, MDMilwaukee, WI 532151023085487
- Joseph Geenen, MDMilwaukee, WI 532151639146392
- Daniel Geenen, M.D.Milwaukee, WI 532151144297508
- Nalini Guda, MDMilwaukee, WI 532151750358420
- Lyndon Hernandez, MDMilwaukee, WI 532151831166503
- Joseph Kim, M.D.Milwaukee, WI 532151962472589
- Helen Lantz, MDMilwaukee, WI 532151639146301
Common questions
What is William John Blosky, M.D.'s NPI number?
William John Blosky, M.D.'s National Provider Identifier (NPI) is 1740506195, issued on Apr 9, 2010. An NPI identifies a provider in billing; it is not a license.
Where is William John Blosky, M.D. located?
The NPPES record lists a practice address at 2801 W Kinnickinnic River Pkwy Ste 1080, Milwaukee, WI, 53215. Phone: (414) 908-6506. Providers update this record themselves, so call before visiting.
How can I verify William John Blosky, M.D.'s license?
NPPES lists Wisconsin license number 65262-20, 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 William John Blosky, M.D. prescribe under Medicare Part D?
In 2024, William John Blosky, M.D. had 1,625 Medicare Part D claims for 679 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.