Jennifer J. Johnston, MD

Medicare activity in 2024

Official CMS public-use data for Jennifer J. Johnston, 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.

Most frequent services

1. Insertion of needle into vein for collection of blood sample (36415)48 services
2. Blood test, comprehensive group of blood chemicals (80053)23 services
3. Hemoglobin a1c level (83036)21 services
4. Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)20 services
5. Blood test, basic group of blood chemicals (calcium, total) (80048)17 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%
• Diabetes46%
• Chronic kidney disease44%
• Ischemic heart disease40%
• Arthritis33%

Hospitals where Jennifer J. Johnston works

Medicare's Facility Affiliation Data lists Jennifer J. Johnston 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.

• St. Mary's HospitalTucson, AZ · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 030010

Practice locations

Addresses where Jennifer J. Johnston is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.

• 101 W Irvington RdTucson, AZ 85714 (520) 670‑3909
• 3655 E Grant RdTucson, AZ 85716 (520) 670‑3909
• 434 E University BlvdTucson, AZ 85705 (520) 670‑3909
• 6950 E Golf Links RdTucson, AZ 85730 (520) 670‑3909
• 7490 S Camino De OesteTucson, AZ 85746 (520) 670‑3909

Group practices

Medicare enrollment lists Jennifer J. Johnston 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

• Family Practiceprimary

Find other Family Practice doctors in Arizona →

Other family doctors in Tucson

Clinicians with the same Medicare primary specialty in Tucson, AZ — not a recommendation.

• Jennifer L. Miller, DO
• Matthew Vargas, DO
• Anna S. Landau, MD
• Jessie M. Pettit, MD
• Steven B. Wallach, DO
• Julie A. Morrison, DO
• Melissa M. Rasmussen, DO
• Christopher P. Marshall, MD

All family doctors in Tucson →

Other clinicians in El Rio Santa Cruz Neighborhood Health Center, Inc.

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Diane M. Wagner, CSW
• Catherine M. Compton, DO
• Elizabeth Dampsey
• Soliman Yaqub, MD
• Calen L. Harding, PA
• Annika S. Mack, NP

Clinician information

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

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians