Joanna B. Tyzack, MD
NPI 1487659892ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Timonium, MD
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) in Timonium, Maryland, trained at Medical University of South Carolina College of Medicine (class of 1988). Their prescriptions cost Medicare Part D more than their services did: $795,104 for 2,506 claims, against $515,827 paid for services in 2024. Corcept Therapeutics was the largest of 23 companies reporting payments in 2025, $914.70 in all, mostly food and beverage.
Overview
| NPI | 1487659892 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 14, 2005 |
| Last updated in NPPES | May 9, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | D42383 | MD |
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 (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 862 |
|---|---|
| Services billed | 20,495 across 29 procedure codes |
| Paid by Medicare | $515,827 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,506 · 6,739 30-day fills |
|---|---|
| Patients | 427 |
| Total drug cost | $795,104 |
| Generic share | 51% of claims |
Education and affiliations
| Medical school | Medical University of South Carolina College of Medicine |
|---|---|
| Graduation year | 1988 |
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- Privia Medical Group, LLCFairfax, VA · 1,533 clinicians
Hospital affiliations
- Greater Baltimore Medical CenterBaltimore, MD
- Johns Hopkins Hospital, theBaltimore, MD
Industry payments (Open Payments)
- 2025$914.70 · 44 payments from 23 companies
- 2024$1,118 · 54 payments from 21 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Corcept Therapeutics | $88.28 | 4 |
| Amgen Inc. | $70.55 | 4 |
| Alexion Pharmaceuticals, Inc. | $68.25 | 3 |
| Lilly USA, LLC | $64.34 | 4 |
| Amneal Pharmaceuticals LLC | $59.55 | 3 |
What the 2025 payments were for
- Food and Beverage$914.70 · 44 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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