Chung-Ying Chen, MD
NPI 1457436081 · Internal Medicine Physician · Sunnyvale, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Chung-Ying Chen, MD is a Internal Medicine Physician provider in Sunnyvale, CA (NPI 1457436081).
Provider details
- NPI number
- 1457436081
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A94535 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
184 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 72 | $111 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 48 | $157 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 38 | $155 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 14 | $216 |
| New Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 15 Minutes Or More99202 | 12 | $89 |
Typical Medicare-allowed amounts for these services range $89–$216 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 68 | 21 |
| Metformin Hcl | 49 | 15 |
| Losartan Potassium | 48 | 11 |
| Hydrochlorothiazide | 33 | — |
| Alendronate Sodium | 29 | — |
| Amlodipine Besylate | 26 | — |
| Atenolol | 23 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-25
- Last updated
- 2011-11-28
Frequently asked questions
- What is Chung-Ying Chen's NPI number?
- Chung-Ying Chen's National Provider Identifier (NPI) is 1457436081, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Chung-Ying Chen's specialty?
- Chung-Ying Chen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Chung-Ying Chen located?
- Chung-Ying Chen's practice location on file with NPPES is 401 Old San Francisco Rd, Sunnyvale, CA 94086-6387.
- What is Chung-Ying Chen's phone number?
- The practice phone number listed in the NPPES registry for Chung-Ying Chen is (408) 730-4262.
- Does Chung-Ying Chen accept Medicare?
- Chung-Ying Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Chung-Ying Chen's NPI active?
- Yes — Chung-Ying Chen's NPI (1457436081) is active in the NPPES registry as of the last update on 2011-11-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.