Joan Y. Sy, DO

Medicare activity in 2024

Official CMS public-use data for Joan Y. Sy, 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 high level of medical decision making, if using time, 40 minutes or more (99215)445 services
2. Osteopathic manipulative treatment, 9-10 body regions (98929)289 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)128 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)55 services
5. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)50 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 cholesterol75%
• High blood pressure56%
• Arthritis55%
• Ischemic heart disease33%
• Anxiety32%
• Osteoporosis28%

Hospitals where Joan Y. Sy works

Medicare's Facility Affiliation Data lists Joan Y. Sy 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.

• Hoag Memorial Hospital PresbyterianNewport Beach, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050224
• Memorialcare Saddleback Medical CenterLaguna Hills, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050603
• Providence Mission HospitalMission Viejo, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050567

Practice locations

Addresses where Joan Y. Sy is enrolled with Medicare (CMS data updated October 2, 2026).

• 24953 Paseo De Valencia, Suite 1aLaguna Hills, CA 92653 (949) 460‑9200

Specialties

• Family Practiceprimary
• Osteopathic Manipulative Medicinealso

Find other Family Practice doctors in California →

Other family doctors in Laguna Hills

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

• Lynn E. Napoli, MD
• Sabeen Munib, MD
• Jorge A. Rivero, MD
• Brian A. Leish, MD
• Mehrdad Salimkhanian, MD
• Michael L. Chang, DO
• Ronald S. Mandel, DO
• Howard K. Bland, MD

All family doctors in Laguna Hills →

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