Margaret A. Chang, MD

Medicare activity in 2024

Official CMS public-use data for Margaret A. Chang, 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. Injection, faricimab-svoa, 0.1 mg (J2777)49,500 services
2. Imaging of retina (92134)3,595 services
3. Injection, ranibizumab-eqrn (cimerli), biosimilar, 0.1 mg (Q5128)2,206 services
4. Injection of drug into eye (67028)2,166 services
5. Injection, avacincaptad pegol, 0.1 mg (J2782)1,960 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%
• Arthritis42%
• Diabetes37%
• Chronic kidney disease30%
• Ischemic heart disease26%

Hospitals where Margaret A. Chang works

Medicare's Facility Affiliation Data lists Margaret A. Chang 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.

• Mercy General HospitalSacramento, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050017

Practice locations

Addresses where Margaret A. Chang is enrolled with Medicare (CMS data updated October 2, 2026).

• 1870 Lassen Blvd, Suite BYuba City, CA 95993 (530) 273‑8358

Group practices

Medicare enrollment lists Margaret A. Chang as a member of this group (CMS data updated October 2, 2026).

• Vitreo-Retinal Medical Group, Inc.22 clinicians in the group

Specialties

• Ophthalmologyprimary

Find other Ophthalmology doctors in California →

Other ophthalmologists in Yuba City

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

• John B. Reed, MD
• Carlos A. Medina Mendez, MD
• David Telander, MD
• Kin K. Yee, MD
• David G. Cupp, MD
• Robert Wendel, MD
• Joel A. Pearlman, MD
• Robert A. Equi, MD

All ophthalmologists in Yuba City →

Other clinicians in Vitreo-Retinal Medical Group, Inc.

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

• John B. Reed, MD
• Carlos A. Medina Mendez, MD
• David Telander, MD
• Maryam Ghiassi, MD
• Kin K. Yee, MD
• Randall Fuerst, OD

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