John Oh, M.D.
NPI 1992730725ActiveIndividual· Internal Medicine· Buffalo Grove, IL
Internal Medicine (M.D.) in Buffalo Grove, Illinois, trained at Northwestern University Feinberg Medical School (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $506,191 for 11,078 claims, against $151,414 paid for services in 2024. Histosonics, Inc. reported $1,352 in payments in 2025, mostly travel and lodging.
Overview
| NPI | 1992730725 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 11, 2006 |
| Last updated in NPPES | Nov 7, 2026 |
| Certified by provider | Nov 7, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036064092 | IL |
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 - Internal Medicine (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 353 |
|---|---|
| Services billed | 2,966 across 21 procedure codes |
| Paid by Medicare | $151,414 |
Part D prescriptions in 2024
| Prescriptions (claims) | 11,078 · 29,795 30-day fills |
|---|---|
| Patients | 953 |
| Total drug cost | $506,191 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | Northwestern University Feinberg Medical School |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- Advocate Lutheran General HospitalPark Ridge, IL
- Northshore University Healthsystem - Evanston HospitalEvanston, IL
Industry payments (Open Payments)
- 2025$1,352 · 6 payments from 1 company
- 2024$24.84 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Histosonics, Inc. | $1,352 | 6 |
What the 2025 payments were for
- Travel and Lodging$1,127 · 4 payments
- Food and Beverage$225.00 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 35 internal medicine physicians in Buffalo Grove · All internal medicine physicians in Illinois