Quick answers
- Does Wynnshang C. Sun accept Medicare assignment?
- Yes. Medicare's clinician data says Wynnshang C. Sun 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 Wynnshang C. Sun see?
- In 2024, CMS data shows 715 Original Medicare patients and 6,919 services for Wynnshang C. Sun. This counts Original Medicare only and measures volume, not quality.
- What is Wynnshang C. Sun's NPI number?
- 1801806732. 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 Wynnshang C. Sun, 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 | 715 |
|---|---|
| Services billed to Medicare | 6,919 |
| Different services or procedures | 61 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)1,432 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)1,099 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)466 services
- Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month (99490)434 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)396 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 pressure66%
- Arthritis42%
- Ischemic heart disease30%
- Osteoporosis23%
- Depression22%
Hospitals where Wynnshang C. Sun works
Medicare's Facility Affiliation Data lists Wynnshang C. Sun 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.
- Scripps Green HospitalLa Jolla, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: not listed by Medicare · CCN 050424
- Scripps Memorial Hospital - EncinitasEncinitas, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050503
- Scripps Memorial Hospital La JollaLa Jolla, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050324
- Scripps Mercy HospitalSan Diego, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050077
- Sharp Coronado Hospital and Healthcare CenterCoronado, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050234
Practice locations
Addresses where Wynnshang C. Sun is enrolled with Medicare (CMS data updated October 2, 2026).
- 9850 Genesee Ave, Suite 870La Jolla, CA 92037 (858) 452‑7040
- 9888 Genesee AveLa Jolla, CA 92037 (858) 457‑4123
Group practices
Medicare enrollment lists Wynnshang C. Sun as a member of this group (CMS data updated October 2, 2026).
- Ximed Hospitalists, Inc.35 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in La Jolla
Clinicians with the same Medicare primary specialty in La Jolla, CA — not a recommendation.
Other clinicians in Ximed Hospitalists, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Virginia School Of Medicine |
| Graduation year | 1996 (30 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1801806732 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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