Joni S. Zapata, MD

Medicare activity in 2024

Official CMS public-use data for Joni S. Zapata, 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. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)39 services
2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)21 services
3. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)11 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%
• Diabetes51%
• Arthritis49%
• Ischemic heart disease49%
• Chronic kidney disease40%

Hospitals where Joni S. Zapata works

Medicare's Facility Affiliation Data lists Joni S. Zapata 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.

• Northridge Hospital Medical CenterNorthridge, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050116

Practice locations

Addresses where Joni S. Zapata is enrolled with Medicare (CMS data updated October 2, 2026).

• 18406 Roscoe Blvd, Suite ANorthridge, CA 91325 (818) 700‑5678
• 18460 Roscoe BlvdNorthridge, CA 91325

Group practices

Medicare enrollment lists Joni S. Zapata as a member of this group (CMS data updated October 2, 2026).

• Dignity Health Medical Foundation1,184 clinicians in the group

Specialties

• Family Practiceprimary

Find other Family Practice doctors in California →

Other family doctors in Northridge

Clinicians with the same Medicare primary specialty in Northridge, CA — not a recommendation.

• Shi Tang, MD
• Elizabeth P. Eddy-Bertrand, MD
• Manessa C. Shaw, DO
• Haik Chatalyan, DO
• Evelyn Hartvig, MD
• Terence B. Thompson, MD
• Amber K. Williams, DO
• Thomas E. Conklin, MD

All family doctors in Northridge →

Other clinicians in Dignity Health Medical Foundation

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

• Eric J. Kuttler, NP
• Garima Handa, MD
• Dao Xiong, MD
• Claudia A. Solorio, CSW
• Ryan Nicholas, MD
• Navjot K. Mangat, MD

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