Seng M. Leong, MD
NPI 1487750790ActiveIndividual· Internal Medicine· Barrington, IL
Internal Medicine (MD) with Advocate Health and Hospitals Corporation, practicing in Barrington, Illinois. Their prescriptions cost Medicare Part D more than their services did: $1,118,723 for 15,554 claims, against $254,851 paid for services in 2024. Lists Advocate Condell Medical Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1487750790 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Sep 15, 2006 |
| Last updated in NPPES | Mar 31, 2025 |
| Certified by provider | Mar 31, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036-055809 | 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 | 682 |
|---|---|
| Services billed | 4,209 across 40 procedure codes |
| Paid by Medicare | $254,851 |
Part D prescriptions in 2024
| Prescriptions (claims) | 15,554 · 37,063 30-day fills |
|---|---|
| Patients | 978 |
| Total drug cost | $1,118,723 |
| Generic share | 90% of claims |
Education and affiliations
| Graduation year | 1969 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Advocate Health and Hospitals CorporationChicago, IL · 3,118 clinicians
Hospital affiliations
- Advocate Condell Medical CenterLibertyville, IL
- Advocate Good Shepherd HospitalBarrington, IL
- Advocate Lutheran General HospitalPark Ridge, IL
- Advocate Sherman HospitalElgin, IL
- Northwestern Medicine McHenryMcHenry, IL
Other facilities
- Advocate Home Health Care ServHome health agency · Oakbrook, IL
- Centerwell Home Health IIHome health agency · Buffalo Grove, IL
- Home Care ExpertsHome health agency · Burr Ridge, IL
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 28 internal medicine physicians in Barrington · All internal medicine physicians in Illinois