Inessa M. Gelfand, M.D.
NPI 1528080637ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Buffalo Grove, IL
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) in Buffalo Grove, Illinois, trained at Rush Medical College of Rush University (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $2,976,072 for 7,227 claims, against $225,592 paid for services in 2024. Dexcom, Inc. was the largest of 29 companies reporting payments in 2025, $2,725 in all, mostly food and beverage.
Overview
| NPI | 1528080637 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 25, 2006 |
| Last updated in NPPES | Jul 17, 2026 |
| Certified by provider | Jul 17, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 036-115321 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 596 |
|---|---|
| Services billed | 4,560 across 44 procedure codes |
| Paid by Medicare | $225,592 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,227 · 12,141 30-day fills |
|---|---|
| Patients | 645 |
| Total drug cost | $2,976,072 |
| Generic share | 44% of claims |
Education and affiliations
| Medical school | Rush Medical College of Rush University |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Tsinman P.C.Deerfield, IL · 2 clinicians
Hospital affiliations
- Advocate Condell Medical CenterLibertyville, IL
- Advocate Good Shepherd HospitalBarrington, IL
- Northshore University Healthsystem - Evanston HospitalEvanston, IL
- Northwest Community Hospital 1Arlington Heights, IL
- Northwestern Lake Forest HospitalLake Forest, IL
Other facilities
- Advanced Home Health Services, IncHome health agency · Northbrook, IL
Industry payments (Open Payments)
- 2025$2,725 · 106 payments from 29 companies
- 2024$2,460 · 88 payments from 23 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Dexcom, Inc. | $397.04 | 8 |
| Amgen Inc. | $222.19 | 7 |
| Novo Nordisk Inc | $186.06 | 9 |
| Medtronic, Inc. | $169.77 | 3 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $155.52 | 7 |
What the 2025 payments were for
- Food and Beverage$2,725 · 106 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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