Quick answers
- Does Alexander D. Zwart accept Medicare assignment?
- Yes. Medicare's clinician data says Alexander D. Zwart accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Alexander D. Zwart see?
- In 2024, CMS data shows 791 Original Medicare patients and 1,466 services for Alexander D. Zwart. This counts Original Medicare only and measures volume, not quality.
- What is Alexander D. Zwart's NPI number?
- 1225018856. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Alexander D. Zwart, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 791 |
|---|---|
| Services billed to Medicare | 1,466 |
| Different services or procedures | 23 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)851 services
- Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report (95251)241 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)123 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)43 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)36 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes60%
- Arthritis46%
- Chronic kidney disease36%
- Ischemic heart disease30%
Hospitals where Alexander D. Zwart works
Medicare's Facility Affiliation Data lists Alexander D. Zwart at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Tucson Medical CenterTucson, AZ · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 030006
Practice locations
Addresses where Alexander D. Zwart is enrolled with Medicare (CMS data updated October 2, 2026).
- 1773 W St Marys Rd, Suite 202Tucson, AZ 85745 (520) 297‑0404
- 3655 E Grant RdTucson, AZ 85716 (520) 670‑3909
- 5910 N La Cholla BlvdTucson, AZ 85741 (520) 297‑0404
- 839 W Congress StTucson, AZ 85745 (520) 670‑3909
Group practices
Medicare enrollment lists Alexander D. Zwart as a member of these groups (CMS data updated October 2, 2026).
- El Rio Santa Cruz Neighborhood Health Center, Inc.275 clinicians in the group
- Tucson Endocrine Associates PLLC4 clinicians in the group
Specialties
- Endocrinologyprimary
- Internal Medicinealso
Other endocrinologists in Tucson
Clinicians with the same Medicare primary specialty in Tucson, AZ — not a recommendation.
Other clinicians in El Rio Santa Cruz Neighborhood Health Center, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 (38 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1225018856 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians