Quick answers
- Does Tien Tsai Tsai accept Medicare assignment?
- Yes. Medicare's clinician data says Tien Tsai Tsai 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 Tien Tsai Tsai see?
- In 2024, CMS data shows 223 Original Medicare patients and 2,674 services for Tien Tsai Tsai. This counts Original Medicare only and measures volume, not quality.
- What is Tien Tsai Tsai's NPI number?
- 1558525196. 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 Tien Tsai Tsai, 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 | 223 |
|---|---|
| Services billed to Medicare | 2,674 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 81 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)1,588 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)271 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)218 services
- Hospital discharge day management, more than 30 minutes (99239)195 services
- Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes (99309)129 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%
- Diabetes75%
- Ischemic heart disease74%
- Chronic kidney disease58%
- Heart failure57%
Hospitals where Tien Tsai Tsai works
Medicare's Facility Affiliation Data lists Tien Tsai Tsai 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.
- New York-Presbyterian/QueensFlushing, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330055
Practice locations
Addresses where Tien Tsai Tsai is enrolled with Medicare (CMS data updated October 2, 2026).
- 41 Mott St, Suite 5New York, NY 10013 (646) 692‑9037
Specialties
- Internal Medicineprimary
- Geriatric Medicinealso
- Hospice/Palliative Carealso
Other internal medicine doctors in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2000 (26 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1558525196 |
| 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