Joanna Louise Spencer-Segal, MD
NPI 1609161611ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Ann Arbor, MI
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) with Regents of the University of Michigan, practicing in Ann Arbor, Michigan. Their prescriptions cost Medicare Part D more than their services did: $3,740,618 for 701 claims, against $5,289 paid for services in 2024. Chiesi USA, Inc. was the largest of 4 companies reporting payments in 2025, $14,661 in all, mostly honoraria. Lists University of Michigan Health System as a hospital affiliation.
Overview
| NPI | 1609161611 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 17, 2011 |
| Last updated in NPPES | Jan 24, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 4301098891 | MI |
| Internal Medicine | 207R00000X | 4301098891 | MI |
| Student in an Organized Health Care Education/Training Program | 390200000X | 4301098891 | 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 - Endocrinology (MI); Practitioner - Endocrinology (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 50 |
|---|---|
| Services billed | 98 across 9 procedure codes |
| Paid by Medicare | $5,289 |
Part D prescriptions in 2024
| Prescriptions (claims) | 701 · 1,548 30-day fills |
|---|---|
| Patients | 108 |
| Total drug cost | $3,740,618 |
| Generic share | 63% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Regents of the University of MichiganAnn Arbor, MI · 3,346 clinicians
Hospital affiliation
- University of Michigan Health SystemAnn Arbor, MI
Industry payments (Open Payments)
- 2025$14,661 · 17 payments from 4 companies
- 2024$4,505 · 6 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Chiesi USA, Inc. | $7,289 | 8 |
| Corcept Therapeutics | $3,850 | 7 |
| Recordati_rare_diseases_inc. | $3,500 | 1 |
| Neurocrine Biosciences, Inc. | $22.28 | 1 |
What the 2025 payments were for
- Honoraria$9,500 · 2 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$3,275 · 1 payment
- Travel and Lodging$1,127 · 4 payments
- Food and Beverage$759.36 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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