Rex Chiu, MD
Internal Medicine Physician · Menlo Park, CA
Rex Chiu, MD is an internal medicine physician with a practice address in Menlo Park, California, and NPI 1366580011, issued on Feb 2, 2007. Check the license (California G84116, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Rex Chiu
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G84116 CA
Self-reported in NPPES; status is on the state search - Practice location
- 321 Middlefield Road, Menlo Park, CA 94025
- Phone
- (650) 815-9577
- Enumerated
- Feb 2, 2007
- Record last updated
- Feb 20, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (650) 289-0166
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 321 Middlefield Road
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jennifer Chan, OTR.,CHTOccupational Therapist1730452251
- Scott Fross, DDSOral and Maxillofacial Surgery (Dentist)1346453982
- Daniel Huie, MDFamily Medicine Physician1295794725
- Jeffery Starr, DDSDentist1750402509
Verify Rex Chiu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G84116Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average internal medicine physician in 2024
426 Medicare Part D claims for 24 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Rosuvastatin Calcium18 claims
- Zolpidem Tartrate15 claims
- Amlodipine Besylate14 claims
- Atorvastatin Calcium13 claims
- Ezetimibe12 claims
- Gabapentin12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $154.10
1 payment: food and beverage; the largest payer was Lilly USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Rex Chiu among 17,696 internal medicine physician records in California
Rex Chiu, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2009 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
47 internal medicine physician records list a practice address in Menlo Park
They are 47 of the 1,265 NPPES records with a practice address in Menlo Park, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Menlo Park → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Yumi Ando, M.D.Menlo Park, CA 940251376658146
- Sara Bunting, MDMenlo Park, CA 940251639181381
- Linda Fresco, MDMenlo Park, CA 940251811092901
- Susan Garay, MDMenlo Park, CA 940251437114006
- F McDowell, MDMenlo Park, CA 940251154384576
- Eileen Moy, MDMenlo Park, CA 940251083617583
- Anthony Powell, MDMenlo Park, CA 940251740247899
- Kristen Sherman, M.D.Menlo Park, CA 940251770513335
Common questions
What is Rex Chiu, MD's NPI number?
Rex Chiu, MD's National Provider Identifier (NPI) is 1366580011, issued on Feb 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Rex Chiu, MD located?
The NPPES record lists a practice address at 321 Middlefield Road, Menlo Park, CA, 94025. Phone: (650) 815-9577. Providers update this record themselves, so call before visiting.
How can I verify Rex Chiu, MD's license?
NPPES lists California license number G84116, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Rex Chiu, MD prescribe under Medicare Part D?
In 2024, Rex Chiu, MD had 426 Medicare Part D claims for 24 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.