Doris Chen, MD
NPI 1013273283 · Internal Medicine Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Doris Chen, MD is a Internal Medicine Physician provider in Stanford, CA (NPI 1013273283).
Provider details
- NPI number
- 1013273283
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A126815 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
14 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
58 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 | 58 | $111 |
Typical Medicare-allowed amounts for these services range $111–$111 (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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 56 | 32 |
| Amlodipine Besylate | 23 | — |
| Levothyroxine Sodium | 22 | 12 |
| Losartan Potassium | 22 | 13 |
| Famotidine | 15 | — |
| Metformin Hcl | 11 | — |
| Omeprazole | 11 |
Practice location
Mailing address
Additional practice locations (1)
- 960 N San Antonio Rd Ste 101Los Altos, CA 94022-1346Phone: (650) 498-9000Fax: (650) 498-9000
Registry dates
- Enumerated
- 2012-04-02
- Last updated
- 2024-04-18
- Certified
- 2024-04-18
Frequently asked questions
- What is Doris Chen's NPI number?
- Doris Chen's National Provider Identifier (NPI) is 1013273283, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Doris Chen's specialty?
- Doris Chen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Doris Chen located?
- Doris Chen's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Doris Chen's phone number?
- The practice phone number listed in the NPPES registry for Doris Chen is (650) 723-4000.
- Does Doris Chen accept Medicare?
- Doris Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Doris Chen's NPI active?
- Yes — Doris Chen's NPI (1013273283) is active in the NPPES registry as of the last update on 2024-04-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.