Quick answers
- Does Margaret S. Horton-Breshears accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret S. Horton-Breshears 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 Margaret S. Horton-Breshears see?
- In 2024, CMS data shows 43 Original Medicare patients and 339 services for Margaret S. Horton-Breshears. This counts Original Medicare only and measures volume, not quality.
- What is Margaret S. Horton-Breshears's NPI number?
- 1740700442. 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 Margaret S. Horton-Breshears, 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 | 43 |
|---|---|
| Services billed to Medicare | 339 |
| Different services or procedures | 54 |
| Participating Medicare provider | Yes |
| Average age of these patients | 68 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)51 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)31 services
- Hemoglobin a1c level (83036)25 services
- Blood test, comprehensive group of blood chemicals (80053)20 services
- Blood test, lipids (cholesterol and triglycerides) (80061)20 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 cholesterol67%
- Diabetes49%
- Arthritis37%
- Asthma26%
Practice locations
Addresses where Margaret S. Horton-Breshears is enrolled with Medicare (CMS data updated October 2, 2026).
- 320 W Prince RdTucson, AZ 85705 (520) 670‑3909
- 3655 E Grant RdTucson, AZ 85716 (520) 670‑3909
- 6950 E Golf Links RdTucson, AZ 85730 (520) 670‑3909
- 839 W Congress StTucson, AZ 85745 (520) 670‑3909
Group practices
Medicare enrollment lists Margaret S. Horton-Breshears as a member of this group (CMS data updated October 2, 2026).
- El Rio Santa Cruz Neighborhood Health Center, Inc.275 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners 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 | NP |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1740700442 |
| 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
- 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