John Yoonkeun Jun, M.D.
NPI 1487878559ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Toledo, OH
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) with University of Toledo Physicians LLC, practicing in Toledo, Ohio. Their prescriptions cost Medicare Part D more than their services did: $191,181 for 712 claims, against $31,009 paid for services in 2024. Ascendis Pharma Endocrinology Inc was the largest of 3 companies reporting payments in 2025, $56.06 in all, mostly food and beverage. Lists Bay Park Community Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1487878559 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 12, 2007 |
| Last updated in NPPES | Feb 10, 2026 |
| Certified by provider | Feb 10, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 35.128476 | OH |
| Internal Medicine, Endocrinology, Diabetes & Metabolism | 207RE0101X | MT187224 | PA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (OH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 187 |
|---|---|
| Services billed | 1,451 across 18 procedure codes |
| Paid by Medicare | $31,009 |
Part D prescriptions in 2024
| Prescriptions (claims) | 712 · 1,348 30-day fills |
|---|---|
| Patients | 164 |
| Total drug cost | $191,181 |
| Generic share | 46% of claims |
Education and affiliations
| Graduation year | 1998 |
|---|---|
| Medicare specialty | Endocrinology |
Medical group
- University of Toledo Physicians LLCToledo, OH · 403 clinicians
Hospital affiliations
- Bay Park Community HospitalOregon, OH
- Blanchard Valley HospitalFindlay, OH
- Fostoria Community HospitalFostoria, OH
- Promedica Toledo HospitalToledo, OH
- University of Toledo Medical CenterToledo, OH
Industry payments (Open Payments)
- 2025$56.06 · 3 payments from 3 companies
- 2024$87.25 · 4 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ascendis Pharma Endocrinology Inc | $23.57 | 1 |
| Medtronic, Inc. | $18.94 | 1 |
| Tandem Diabetes Care, Inc. | $13.55 | 1 |
What the 2025 payments were for
- Food and Beverage$56.06 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other endocrinologists in Toledo
- 1174570337
- 1255726766
- 1275053191
- 1346458767
- 1649277328
- 1740488279
- 1891296562
- 1902866387
- 1922502921
- 1235459694
- 1952985830
- 1053042317
All 26 endocrinologists in Toledo · All endocrinologists in Ohio