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

John Yoonkeun Jun, MD

Individual provider Endocrinology, Diabetes & Metabolism Physician · NPI 1487878559

John Yoonkeun Jun, MD practises Endocrinology in Toledo, Ohio. Qualified in 1998, 28 years ago. Practices with University of Toledo Physicians LLC, a 395-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Ohio and Pennsylvania.

Years since qualifying
28
Licensed in
OH, PA
In the registry since
2007
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

2100 W Central Ave Fl 2
Toledo, OH 43606
Phone: (567) 420-1600
Fax: (567) 420-1633
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 3125 Transverse Dr, Toledo, OH 43614-8008 — (419) 383-3780
  • 3125 Transverse Dr, Toledo, OH 43614-8008 — (419) 383-3780

Specialties & licences

Endocrinology, Diabetes & Metabolism Physician (primary) Taxonomy 207RE0101X · Licence 35.128476 (OH)
Endocrinology, Diabetes & Metabolism Physician Taxonomy 207RE0101X · Licence MT187224 (PA)

Record details

NPI number1487878559
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 12, 2007
Last updated in NPPESFebruary 10, 2026
Certification dateFebruary 10, 2026

Medicare enrollment

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

Medicare specialtyENDOCRINOLOGY
Medical schoolOTHER
Graduated 1998 (28 years in practice)
Group practice University Of Toledo Physicians Llc — 395 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients187
Services billed 1,451 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $56 3 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at University of Toledo Physicians LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 395 clinicians in the practice; 12 are shown here.

Other providers in Toledo