Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

William John Blosky, MD

Individual provider Internal Medicine Physician · NPI 1740506195

William John Blosky, MD practises Gastroenterology in Milwaukee, Wisconsin. Graduated from Indiana University School of Medicine in 2010, 16 years ago. Practices with Gastroenterology Specialists SC, a 29-clinician group. Licensed in Ohio and Wisconsin.

Years since qualifying
16
Trained at
Indiana University School of Medicine
Licensed in
OH, WI
In the registry since
2010
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2801 W Kinnickinnic River Pkwy Ste 1080
Milwaukee, WI 53215-3689
Phone: (414) 908-6506
Fax: (414) 908-6510
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 65262-20 (WI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 121652 (OH)

Record details

NPI number1740506195
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 9, 2010
Last updated in NPPESJanuary 26, 2026
Certification dateJanuary 26, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGASTROENTEROLOGY
Medical schoolINDIANA UNIVERSITY SCHOOL OF MEDICINE
Graduated 2010 (16 years in practice)
Group practice Gastroenterology Specialists Sc — 29 clinicians
Accepts Medicare assignment Not indicated
Practice locations3 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 142 times · 87th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 94 times · 75th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients371
Services billed 575 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Gastroenterology Specialists SC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 29 clinicians in the practice; 12 are shown here.

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