Tsung Chang Chen, M.D.
NPI 1669546651 · Pulmonary Disease Physician · Cupertino, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tsung Chang Chen, M.D. is a Pulmonary Disease Physician provider in Cupertino, CA (NPI 1669546651).
Provider details
- NPI number
- 1669546651
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A45142 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
813 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 523 | $85 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 177 | $155 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 79 | $215 |
| Initial Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, 50 Minutes Or More99306 | 34 | $196 |
Typical Medicare-allowed amounts for these services range $85–$215 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 96 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 329 | 49 |
| Amlodipine Besylate | 259 | 52 |
| Atorvastatin Calcium | 253 | 60 |
| Metformin Hcl | 164 | 35 |
| Metoprolol Succinate | 126 | 28 |
| Ipratropium/Albuterol Sulfatebrand: Ipratropium-Albuterol | 105 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,273 across 33 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-20
- Last updated
- 2007-07-08
Frequently asked questions
- What is Tsung Chang Chen's NPI number?
- Tsung Chang Chen's National Provider Identifier (NPI) is 1669546651, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tsung Chang Chen's specialty?
- Tsung Chang Chen is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Tsung Chang Chen located?
- Tsung Chang Chen's practice location on file with NPPES is 10430 S De Anza Blvd, Cupertino, CA 95014-3019.
- What is Tsung Chang Chen's phone number?
- The practice phone number listed in the NPPES registry for Tsung Chang Chen is (408) 257-8860.
- Does Tsung Chang Chen accept Medicare?
- Tsung Chang Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tsung Chang Chen's NPI active?
- Yes — Tsung Chang Chen's NPI (1669546651) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.