Quick answers
- Does Tiffany I. Hsieh accept Medicare assignment?
- Yes. Medicare's clinician data says Tiffany I. Hsieh 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 Tiffany I. Hsieh see?
- In 2024, CMS data shows 15 Original Medicare patients and 17 services for Tiffany I. Hsieh. This counts Original Medicare only and measures volume, not quality.
- What is Tiffany I. Hsieh's NPI number?
- 1912169517. 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 Tiffany I. Hsieh, 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 | 15 |
|---|---|
| Services billed to Medicare | 17 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Emergency department visit with high level of medical decision making (99285)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 cholesterol73%
Hospitals where Tiffany I. Hsieh works
Medicare's Facility Affiliation Data lists Tiffany I. Hsieh 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.
- Kaiser Foundation Hospital - San LeandroSan Leandro, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050777
Practice locations
Addresses where Tiffany I. Hsieh is enrolled with Medicare (CMS data updated October 2, 2026).
- 3800 Dale RdModesto, CA 95356 (209) 735‑5000
- 710 S BroadwayWalnut Creek, CA 94596 (925) 295‑4145
Group practices
Medicare enrollment lists Tiffany I. Hsieh as a member of this group (CMS data updated October 2, 2026).
- Permanente Medical Group Inc10,996 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Modesto
Clinicians with the same Medicare primary specialty in Modesto, CA — not a recommendation.
Other clinicians in Permanente Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Columbia University College Of Physicians And Surgeons |
| Graduation year | 2008 (18 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1912169517 |
| 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