Allen C. Chiu, MD
Internal Medicine Physician · Hayward, CA
Allen C. Chiu, MD is an internal medicine physician with a practice address in Hayward, California, and NPI 1316025166, issued on Nov 1, 2006. Check the license (California A68906, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Allen C. Chiu
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A68906 CA
Self-reported in NPPES; status is on the state search - Practice location
- 27400 Hesperian Blvd, Hayward, CA 94545
- Phone
- (510) 784-4000
- Enumerated
- Nov 1, 2006
- Record last updated
- Dec 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A689060 CA
- Medicare enrollment
- Enrolled (PECOS I20110310000284); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 27400 Hesperian Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Allen C. Chiu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A68906Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% more Medicare Part D claims than the average internal medicine physician in 2024
3,831 Medicare Part D claims for 447 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims. 57 claims were for opioids.
Most prescribed
- Atorvastatin Calcium588 claims
- Amlodipine Besylate254 claims
- Lisinopril169 claims
- Losartan Potassium163 claims
- Atenolol151 claims
- Metformin Hcl Er144 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
- Permanente Medical Group IncUnion City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Allen C. Chiu among 17,696 internal medicine physician records in California
Allen C. 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1995 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
40 internal medicine physician records list a practice address in Hayward
They are 40 of the 3,993 NPPES records with a practice address in Hayward, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Hayward → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Anderson, MDHayward, CA 945451659459410
- Abubakr Asadulla, M.D.Hayward, CA 945451881772648
- Yogesh Bhakta, MDHayward, CA 945451518045376
- Min-Shong Chang, MDHayward, CA 945451063479269
- Gerald Frank, MDHayward, CA 945451124106976
- Neil Handelman, MDHayward, CA 945451528146396
- Kaarel Kaljot, M.D.Hayward, CA 945451275578015
- Eric Kohleriter, M.D.Hayward, CA 945451649207523
Common questions
What is Allen C. Chiu, MD's NPI number?
Allen C. Chiu, MD's National Provider Identifier (NPI) is 1316025166, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Allen C. Chiu, MD located?
The NPPES record lists a practice address at 27400 Hesperian Blvd, Hayward, CA, 94545. Phone: (510) 784-4000. Providers update this record themselves, so call before visiting.
How can I verify Allen C. Chiu, MD's license?
NPPES lists California license number A68906, 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 Allen C. Chiu, MD prescribe under Medicare Part D?
In 2024, Allen C. Chiu, MD had 3,831 Medicare Part D claims for 447 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.