Quick answers
- Does Tsung-Chang Chen accept Medicare assignment?
- Yes. Medicare's clinician data says Tsung-Chang Chen 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 Tsung-Chang Chen see?
- In 2024, CMS data shows 205 Original Medicare patients and 826 services for Tsung-Chang Chen. This counts Original Medicare only and measures volume, not quality.
- What is Tsung-Chang Chen's NPI number?
- 1669546651. 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 Tsung-Chang Chen, 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 | 205 |
|---|---|
| Services billed to Medicare | 826 |
| Different services or procedures | 9 |
| Participating Medicare provider | Yes |
| Average age of these patients | 64 |
Most frequent services
- Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)523 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)177 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)79 services
- Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more (99306)34 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 pressure69%
- High cholesterol58%
- Diabetes40%
- Anxiety25%
- Depression11%
- Heart failure11%
Practice locations
Addresses where Tsung-Chang Chen is enrolled with Medicare (CMS data updated October 2, 2026).
- 10430 S De Anza Blvd, Suite 220Cupertino, CA 95014 (408) 257‑8860
Specialties
- Internal Medicineprimary
- Pulmonary Diseasealso
Other internal medicine doctors in Cupertino
Clinicians with the same Medicare primary specialty in Cupertino, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical Branch At Galveston |
| Graduation year | 1987 (39 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669546651 |
| 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
- 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