Alexander Dominicus Zwart, MD, FACP
NPI 1225018856ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Tucson, AZ
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD, FACP) with El Rio Santa Cruz Neighborhood Health Center, Inc. and 1 other group, practicing in Tucson, Arizona. Their prescriptions cost Medicare Part D more than their services did: $3,045,422 for 6,823 claims, against $118,085 paid for services in 2024. Neurocrine Biosciences, Inc. was the largest of 8 companies reporting payments in 2025, $157.85 in all, mostly food and beverage. Lists Tucson Medical Center as a hospital affiliation.
Overview
| NPI | 1225018856 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD, FACP |
| Sole proprietor | No |
| NPI issued | Jan 19, 2006 |
| Last updated in NPPES | Dec 4, 2025 |
| Certified by provider | Dec 4, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 23182 | AZ |
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 (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 791 |
|---|---|
| Services billed | 1,466 across 23 procedure codes |
| Paid by Medicare | $118,085 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,823 · 17,237 30-day fills |
|---|---|
| Patients | 996 |
| Total drug cost | $3,045,422 |
| Generic share | 57% of claims |
Education and affiliations
| Graduation year | 1988 |
|---|---|
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- El Rio Santa Cruz Neighborhood Health Center, Inc.Tucson, AZ · 275 clinicians
- Tucson Endocrine Associates PLLCTucson, AZ · 4 clinicians
Hospital affiliation
- Tucson Medical CenterTucson, AZ
Industry payments (Open Payments)
- 2025$157.85 · 8 payments from 8 companies
- 2024$326.21 · 12 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Neurocrine Biosciences, Inc. | $32.12 | 1 |
| Novo Nordisk Inc | $24.64 | 1 |
| Medtronic, Inc. | $19.46 | 1 |
| Amgen Inc. | $18.13 | 1 |
| Sequel Med Tech, LLC | $16.50 | 1 |
What the 2025 payments were for
- Food and Beverage$157.85 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 40 endocrinologists in Tucson · All endocrinologists in Arizona