Chien-Wai Chiu, MD
Geriatric Medicine (Internal Medicine) Physician · San Jose, CA
Chien-Wai Chiu, MD is a geriatric medicine (internal medicine) physician with a practice address in San Jose, California, and NPI 1013544931, issued on Mar 23, 2020. Check the license (California A181509, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Chien-Wai Chiu
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- A181509 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1870 Lundy Ave, San Jose, CA 95131
- Phone
- (408) 573-9686
- Enumerated
- Mar 23, 2020
- Record last updated
- Aug 1, 2024
- Medicare enrollment
- Enrolled (PECOS I20240911004374); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 532 in California → Look up another NPI →
Also registered at 1870 Lundy Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Chien-Wai Chiu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A181509Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
390 Medicare Part D claims for 148 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium23 claims
- Losartan Potassium20 claims
- Amlodipine Besylate19 claims
- Omeprazole17 claims
- Metformin Hcl11 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.
Bills Medicare through one group practice
- North East Medical ServicesSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Chien-Wai Chiu among 532 geriatric medicine (internal medicine) physician records in California
Chien-Wai Chiu, MD is one of 532 geriatric medicine (internal medicine) physician records with a practice address in California. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 93% of them.
- NPI issued2020 · 93% of these records are older, 5% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 51% of these records are
- Graduated2019 · median 1999 among the 271 with a school on file
- Record last updated2024 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in California
There are 532 geriatric medicine (internal medicine) physician records in California.
All 532 in California → Every provider in San Jose → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Haresh Ruparel, M.D.San Jose, CA 951291124071477
- Nirmala Gopalan, MDSan Jose, CA 951281073627014
- Thomas Kelsey, MDSan Jose, CA 951281528022530
- Pamela Ann Sebastian, MBBSSan Jose, CA 951281922311505
- Gary Steinke, MDSan Jose, CA 951281629161161
- Dushyant Patel, MDSan Jose, CA 951161073595278
- Robert Keet, M.D.Santa Cruz, CA 950651639272750
- Lawrence Rosenbaum, M.D.Santa Cruz, CA 950651467555474
Common questions
What is Chien-Wai Chiu, MD's NPI number?
Chien-Wai Chiu, MD's National Provider Identifier (NPI) is 1013544931, issued on Mar 23, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Chien-Wai Chiu, MD located?
The NPPES record lists a practice address at 1870 Lundy Ave, San Jose, CA, 95131. Phone: (408) 573-9686. Providers update this record themselves, so call before visiting.
How can I verify Chien-Wai Chiu, MD's license?
NPPES lists California license number A181509, 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 Chien-Wai Chiu, MD prescribe under Medicare Part D?
In 2024, Chien-Wai Chiu, MD had 390 Medicare Part D claims for 148 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.