Kelsey Marie Lemmen, M.D.
NPI 1124689120ActiveIndividual· Internal Medicine, Rheumatology· Detroit, MI
Internal Medicine, Rheumatology (M.D.) in Detroit, Michigan, trained at University of Michigan Medical School (class of 2019). Their prescriptions cost Medicare Part D more than their services did: $241,508 for 2,084 claims, against $12,493 paid for services in 2024. Janssen Biotech, Inc. was the largest of 2 companies reporting payments in 2025, $197.52 in all, mostly food and beverage.
Overview
| NPI | 1124689120 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 21, 2019 |
| Last updated in NPPES | Jun 12, 2026 |
| Certified by provider | Jun 12, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | 4301507251 | MI |
| Internal Medicine | 207R00000X | 4301507251 | MI |
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 - Rheumatology (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 119 |
|---|---|
| Services billed | 164 across 15 procedure codes |
| Paid by Medicare | $12,493 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,084 · 5,265 30-day fills |
|---|---|
| Patients | 277 |
| Total drug cost | $241,508 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | University of Michigan Medical School |
|---|---|
| Graduation year | 2019 |
| Medicare specialty | Rheumatology |
| Secondary specialties | Internal Medicine |
Medical groups
- Henry Ford Health SystemDetroit, MI · 2,570 clinicians
- Henry Ford Health St. John HospitalDetroit, MI · 348 clinicians
Industry payments (Open Payments)
- 2025$197.52 · 2 payments from 2 companies
- 2024$226.99 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $100.14 | 1 |
| Janssen Scientific Affairs, LLC | $97.38 | 1 |
What the 2025 payments were for
- Food and Beverage$197.52 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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