Edwin Jonathan Chiu, M.D.
Nephrology Physician · Napa, CA
Edwin Jonathan Chiu, M.D. is a nephrology physician with a practice address in Napa, California, and NPI 1659392223, issued on Jul 21, 2006. Check the license (California A96262, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Edwin Jonathan Chiu
- Credential
- M.D.
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- A96262 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3230 Beard RD, Napa, CA 94558
- Phone
- (707) 253-7005
- Enumerated
- Jul 21, 2006
- Record last updated
- Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (707) 253-7268
- Medicaid ID
- 00A962620 CA
- Medicare enrollment
- Enrolled (PECOS I20070212000574); accepts Medicare assignment
- Medical or professional school
- University Of Rochester School Of Medicine And Dentistry, 2001
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 3230 Beard RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Laurel Antonucci, LCSWClinical Social Worker1346263761
- Melissa Datu, APNAdult Health Nurse Practitioner1144572876
- George Friedman, MDFamily Medicine Physician1477647212
- Stephen Gugenheim, M.D.Plastic Surgery within the Head & Neck (Otolaryngology) Physician1174501340
- Nagarathna Manjappa, MDNephrology Physician1710093349
- David Martinez, DOFamily Medicine Physician1023105178
Verify Edwin Jonathan Chiu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A96262Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% fewer Medicare Part D claims than the average nephrology physician in 2024
1,330 Medicare Part D claims for 254 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate108 claims
- Losartan Potassium99 claims
- Furosemide95 claims
- Calcitriol81 claims
- Lisinopril62 claims
- Sevelamer Carbonate60 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 IncVacaville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Edwin Jonathan Chiu among 1,468 nephrology physician records in California
Edwin Jonathan Chiu, M.D. is one of 1,468 nephrology physician records with a practice address in California. 88% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 48% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2001 · median 2001 among the 1,128 with a school on file
- Record last updated2021 · 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 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Napa → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Serena Bhela, M.D.Napa, CA 945581275873812
- Nagarathna Manjappa, MDNapa, CA 945581710093349
- Geetha Narayan, MDNapa, CA 945581386625754
- Thomas Paukert, M.D.Napa, CA 945581013989540
- Trixie Lorraine Pei, MDNapa, CA 945581538664669
- Jonathan Segal, MDMartinez, CA 945531780666164
- Archana Aggarwal, M.D.Castro Valley 94546, CA 945461326024084
- Gene-Yuan Chang, MDCastro Valley, CA 945461467731828
Common questions
What is Edwin Jonathan Chiu, M.D.'s NPI number?
Edwin Jonathan Chiu, M.D.'s National Provider Identifier (NPI) is 1659392223, issued on Jul 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Edwin Jonathan Chiu, M.D. located?
The NPPES record lists a practice address at 3230 Beard RD, Napa, CA, 94558. Phone: (707) 253-7005. Providers update this record themselves, so call before visiting.
How can I verify Edwin Jonathan Chiu, M.D.'s license?
NPPES lists California license number A96262, 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 Edwin Jonathan Chiu, M.D. prescribe under Medicare Part D?
In 2024, Edwin Jonathan Chiu, M.D. had 1,330 Medicare Part D claims for 254 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.