Quick answers
- Does Sharon Y. Chien accept Medicare assignment?
- Yes. Medicare's clinician data says Sharon Y. Chien 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 Sharon Y. Chien see?
- In 2024, CMS data shows 273 Original Medicare patients and 352 services for Sharon Y. Chien. This counts Original Medicare only and measures volume, not quality.
- What is Sharon Y. Chien's NPI number?
- 1316955420. 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 Sharon Y. Chien, 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 | 273 |
|---|---|
| Services billed to Medicare | 352 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)199 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)111 services
- Hospital discharge day management, more than 30 minutes (99239)23 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)13 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%
- Arthritis56%
- Ischemic heart disease50%
- Diabetes44%
- Chronic kidney disease44%
Hospitals where Sharon Y. Chien works
Medicare's Facility Affiliation Data lists Sharon Y. Chien 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 Memorial Hospital La JollaLa Jolla, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050324
- Sharp Chula Vista Medical CenterChula Vista, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050222
- Sharp Memorial HospitalSan Diego, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050100
Practice locations
Addresses where Sharon Y. Chien is enrolled with Medicare (CMS data updated October 2, 2026).
- 2929 Health Ctr DrSan Diego, CA 92123 (858) 499‑2600
- 4647 Zion AveSan Diego, CA 92120 (619) 528‑5000
- 9888 Genesee AveLa Jolla, CA 92037 (858) 457‑4123
Group practices
Medicare enrollment lists Sharon Y. Chien as a member of these groups (CMS data updated October 2, 2026).
- Southern California Permanente Medical Group11,293 clinicians in the group
- Sharp Rees-Stealy Medical Group Inc884 clinicians in the group
- Ximed Hospitalists, Inc.35 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in San Diego
Clinicians with the same Medicare primary specialty in San Diego, CA — not a recommendation.
Other clinicians in Southern California Permanente Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Davis School Of Medicine |
| Graduation year | 2002 (24 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1316955420 |
| 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