Lenar Tatios Yessayan, M.D.
NPI 1023210861ActiveIndividual· Internal Medicine, Nephrology· Ann Arbor, MI
Internal Medicine, Nephrology (M.D.) with Regents of the University of Michigan, practicing in Ann Arbor, Michigan. Mostly services rather than prescriptions: Medicare paid $43,184 for 66 patients in 2024, with only 34 Part D claims. Vantive US Healthcare LLC was the largest of 4 companies reporting payments in 2025, $24,775 in all, mostly education. Lists University of Michigan Health System as a hospital affiliation.
Overview
| NPI | 1023210861 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 4, 2007 |
| Last updated in NPPES | Jan 14, 2026 |
| Certified by provider | Jan 14, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 4301082653 | MI |
| Internal Medicine | 207R00000X | 4301082653 | MI |
| Internal Medicine, Critical Care Medicine | 207RC0200X | 4301082653 | MI |
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 - Nephrology (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 66 |
|---|---|
| Services billed | 341 across 10 procedure codes |
| Paid by Medicare | $43,184 |
Part D prescriptions in 2024
| Prescriptions (claims) | 34 · 78 30-day fills |
|---|---|
| Total drug cost | $7,082 |
| Generic share | 68% of claims |
Education and affiliations
| Graduation year | 2001 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
Medical group
- Regents of the University of MichiganAnn Arbor, MI · 3,346 clinicians
Hospital affiliation
- University of Michigan Health SystemAnn Arbor, MI
Other facilities
- Univ of Mi Dialysis Clinics - LivoniaDialysis facility · Livonia, MI
Industry payments (Open Payments)
- 2025$24,775 · 35 payments from 4 companies
- 2024$10,605 · 18 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vantive US Healthcare LLC | $24,380 | 30 |
| Nxstage Medical, Inc. | $245.31 | 3 |
| Mallinckrodt Hospital Products Inc. | $114.52 | 1 |
| Amgen Inc. | $35.25 | 1 |
What the 2025 payments were for
- Education$16,900 · 5 payments
- Consulting Fee$4,000 · 3 payments
- Travel and Lodging$2,446 · 8 payments
- Food and Beverage$1,429 · 19 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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