Michael S. Linsey, M.D.
NPI 1841215217ActiveIndividual· Internal Medicine, Nephrology· Pasadena, CA
Internal Medicine, Nephrology (M.D.) in Pasadena, California, trained at University of California, Davis School of Medicine (class of 1977). Their prescriptions cost Medicare Part D more than their services did: $310,905 for 1,507 claims, against $104,491 paid for services in 2024. Novartis Pharmaceuticals Corporation was the largest of 3 companies reporting payments in 2025, $82.44 in all, mostly food and beverage.
Overview
| NPI | 1841215217 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 13, 2006 |
| Last updated in NPPES | Feb 26, 2026 |
| Certified by provider | Feb 26, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 05D0681297 | CA |
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 - Nephrology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 148 |
|---|---|
| Services billed | 985 across 16 procedure codes |
| Paid by Medicare | $104,491 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,507 · 3,437 30-day fills |
|---|---|
| Patients | 130 |
| Total drug cost | $310,905 |
| Generic share | 80% of claims |
Education and affiliations
| Medical school | University of California, Davis School of Medicine |
|---|---|
| Graduation year | 1977 |
| Medicare specialty | Nephrology |
Medical group
- Pasadena Nephrology Corporation A Medical GroupPasadena, CA · 5 clinicians
Hospital affiliation
- Huntington HospitalPasadena, CA
Other facilities
- Davita Huntington DialysisDialysis facility · Pasadena, CA
Industry payments (Open Payments)
- 2025$82.44 · 4 payments from 3 companies
- 2024$80.30 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novartis Pharmaceuticals Corporation | $44.51 | 2 |
| Glaxosmithkline, LLC. | $24.25 | 1 |
| Otsuka America Pharmaceutical, Inc. | $13.68 | 1 |
What the 2025 payments were for
- Food and Beverage$82.44 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 20 nephrologists in Pasadena · All nephrologists in California