Derek Phan, M.D.
NPI 1073729588 · Internal Medicine Physician · Westminster, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Derek Phan, M.D. is a Internal Medicine Physician provider in Westminster, CA (NPI 1073729588).
Provider details
- NPI number
- 1073729588
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A99908 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 67 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 334 | 90 |
| Atorvastatin Calcium | 288 | 82 |
| Metformin Hcl | 217 | 58 |
| Rosuvastatin Calcium | 205 | 58 |
| Losartan Potassium | 181 | 51 |
| Metoprolol Succinate | 159 | 47 |
| Empagliflozin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$25 across 1 record (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
- 2007-05-14
- Last updated
- 2009-10-07
Frequently asked questions
- What is Derek Phan's NPI number?
- Derek Phan's National Provider Identifier (NPI) is 1073729588, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Derek Phan's specialty?
- Derek Phan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Derek Phan located?
- Derek Phan's practice location on file with NPPES is 9191 Bolsa Ave Ste 205, Westminster, CA 92683-5561.
- What is Derek Phan's phone number?
- The practice phone number listed in the NPPES registry for Derek Phan is (714) 891-7035.
- Does Derek Phan accept Medicare?
- Derek Phan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Derek Phan's NPI active?
- Yes — Derek Phan's NPI (1073729588) is active in the NPPES registry as of the last update on 2009-10-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.