Claire Diep, M.D.
NPI 1366508707 · Internal Medicine Physician · Union City, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Claire Diep, M.D. is a Internal Medicine Physician provider in Union City, CA (NPI 1366508707).
Provider details
- NPI number
- 1366508707
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A55900 (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
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
1,728 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,355 | $147 |
| Administration of Influenza Virus VaccineG0008 | 181 | $39 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 146 | $90 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 18 | $44 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 14 | $197 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent Visit |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 63 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 838 | 229 |
| Losartan Potassium | 486 | 127 |
| Amlodipine Besylate | 482 | 120 |
| Metformin Hcl | 380 | 98 |
| Metoprolol Succinate | 175 | 51 |
| Lisinopril | 171 | 42 |
| Alendronate Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-29
- Last updated
- 2007-07-17
Frequently asked questions
- What is Claire Diep's NPI number?
- Claire Diep's National Provider Identifier (NPI) is 1366508707, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Claire Diep's specialty?
- Claire Diep is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Claire Diep located?
- Claire Diep's practice location on file with NPPES is 33509 Western Avenue, Union City, CA 94587.
- What is Claire Diep's phone number?
- The practice phone number listed in the NPPES registry for Claire Diep is (510) 441-8081.
- Does Claire Diep accept Medicare?
- Claire Diep is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Claire Diep's NPI active?
- Yes — Claire Diep's NPI (1366508707) is active in the NPPES registry as of the last update on 2007-07-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.