Margaret Chen, M.D
NPI 1659305084 · Internal Medicine Physician · Escondido, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Chen, M.D is a Internal Medicine Physician provider in Escondido, CA (NPI 1659305084).
Provider details
- NPI number
- 1659305084
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Female
- Sole proprietor
- No
- License
- A61751 (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 · 68 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 238 | 73 |
| Metformin Hcl | 207 | 60 |
| Amlodipine Besylate | 163 | 49 |
| Lisinopril | 159 | 53 |
| Simvastatin | 152 | 41 |
| Semaglutidebrand: Ozempic | 120 | 23 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$147 across 2 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
- 2006-07-10
- Last updated
- 2007-07-08
Frequently asked questions
- What is Margaret Chen's NPI number?
- Margaret Chen's National Provider Identifier (NPI) is 1659305084, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Chen's specialty?
- Margaret Chen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Chen located?
- Margaret Chen's practice location on file with NPPES is 460 N Elm St, Escondido, CA 92025-3002.
- What is Margaret Chen's phone number?
- The practice phone number listed in the NPPES registry for Margaret Chen is (760) 737-2000.
- Does Margaret Chen accept Medicare?
- Margaret Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Chen's NPI active?
- Yes — Margaret Chen's NPI (1659305084) 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.