Rex Chiu, MD
NPI 1366580011 · Internal Medicine Physician · Menlo Park, CA
Rex Chiu, MD is a Internal Medicine Physician provider in Menlo Park, CA (NPI 1366580011).
Provider details
- NPI number
- 1366580011
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G84116 (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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Rosuvastatin Calcium | 18 |
| Zolpidem Tartrate | 15 |
| Amlodipine Besylate | 14 |
| Atorvastatin Calcium | 13 |
| Ezetimibe | 12 |
| Gabapentin | 12 |
| Irbesartan | 12 |
| Montelukast Sodium | 12 |
| Megestrol Acetate | 11 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$154 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
- 2007-02-02
- Last updated
- 2009-02-20
Frequently asked questions
- What is Rex Chiu's NPI number?
- Rex Chiu's National Provider Identifier (NPI) is 1366580011, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rex Chiu's specialty?
- Rex Chiu is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Rex Chiu located?
- Rex Chiu's practice location on file with NPPES is 321 Middlefield Road, Menlo Park, CA 94025.
- What is Rex Chiu's phone number?
- The practice phone number listed in the NPPES registry for Rex Chiu is (650) 815-9577.
- Is Rex Chiu's NPI active?
- Yes — Rex Chiu's NPI (1366580011) is active in the NPPES registry as of the last update on 2009-02-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.