Derek Cheung, MD
NPI 1336671981 · Internal Medicine Physician · San Marino, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Derek Cheung, MD is a Internal Medicine Physician provider in San Marino, CA (NPI 1336671981).
Provider details
- NPI number
- 1336671981
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A158438 (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
9 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 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 64 | 28 |
| Amlodipine Besylate | 46 | 22 |
| Rosuvastatin Calcium | 42 | 20 |
| Omeprazole | 33 | 18 |
| Lisinopril | 27 | — |
| Metformin Hcl | 27 | 11 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$48 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
- 2017-04-03
- Last updated
- 2022-01-22
- Certified
- 2022-01-22
Frequently asked questions
- What is Derek Cheung's NPI number?
- Derek Cheung's National Provider Identifier (NPI) is 1336671981, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Derek Cheung's specialty?
- Derek Cheung is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Derek Cheung located?
- Derek Cheung's practice location on file with NPPES is 375 Huntington Dr Ste G, San Marino, CA 91108-2357.
- What is Derek Cheung's phone number?
- The practice phone number listed in the NPPES registry for Derek Cheung is (626) 441-4231.
- Does Derek Cheung accept Medicare?
- Derek Cheung is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Derek Cheung's NPI active?
- Yes — Derek Cheung's NPI (1336671981) is active in the NPPES registry as of the last update on 2022-01-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.