Walter W. Chien, MD
Clinical Cardiac Electrophysiology Physician · Stockton, CA
Walter W. Chien, MD is a clinical cardiac electrophysiology physician with a practice address in Stockton, California, and NPI 1386615631, issued on Jan 26, 2006. Check the license (California G56242, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Walter W. Chien
- Credential
- MD
- Primary taxonomy
- Clinical Cardiac Electrophysiology Physician 207RC0001X
- License number
- G56242 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2800 N California St Ste 8, Stockton, CA 95204
- Phone
- (209) 938-0232
- Enumerated
- Jan 26, 2006
- Record last updated
- Nov 4, 2022
- Fax
- (209) 938-0233
- Medicare enrollment
- Enrolled (PECOS I20050923000981); accepts Medicare assignment
- Medical or professional school
- Washington University School Of Medicine, 1984
- Entity
- Type 1 · individual
8 nearest clinical cardiac electrophysiology physician records → All 304 in California → Look up another NPI →
Verify Walter W. Chien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G56242Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average clinical cardiac electrophysiology physician in 2024
29 Medicare Part D claims for 16 beneficiaries, against an average of 1,710 among the 3,173 providers of this specialty who prescribed in Part D.
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.
The MIPS final score for 2023 (Medicare payment program): 96.5 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $93.50
3 payments; by number, the most common kind was food and beverage; the largest payer was Medtronic, Inc. The 3,167 providers of this specialty with any payment received $10,651.37 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.
Bills Medicare through one group practice
- County OF San JoaquinFrench Camp, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Walter W. Chien among 304 clinical cardiac electrophysiology physician records in California
Walter W. Chien, MD is one of 304 clinical cardiac electrophysiology physician records with a practice address in California. 93% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 58% newer
- In a Medicare fileYes · 93% of these records are
- In the CMS Doctors and Clinicians fileYes · 87% of these records are
- Graduated1984 · median 2002 among the 261 with a school on file
- Record last updated2022 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Clinical Cardiac Electrophysiology Physician providers in California
There are 304 clinical cardiac electrophysiology physician records in California.
All 304 in California → Every provider in Stockton → Clinical Cardiac Electrophysiology Physician nationwide →
The 8 clinical cardiac electrophysiology physician records with the nearest ZIP codes
- Rashaad Chothia, MDStockton, CA 952041285897892
- Cyrus Szeto-Wong, M.D.San Jose, CA 951281306166343
- Dwain Coggins, M.D.San Jose, CA 951241598721318
- Matthew Levy, M.D.San Jose, CA 951241649334079
- Firas Ajam, MDWatsonville, CA 950761134652282
- Navneet Dullet, MDModesto, CA 953501073680971
- Raman Moradkhan, MDModesto, CA 953551427025766
- Lawrence Waspe, MDModesto, CA 953551497718704
Common questions
What is Walter W. Chien, MD's NPI number?
Walter W. Chien, MD's National Provider Identifier (NPI) is 1386615631, issued on Jan 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Walter W. Chien, MD located?
The NPPES record lists a practice address at 2800 N California St Ste 8, Stockton, CA, 95204. Phone: (209) 938-0232. Providers update this record themselves, so call before visiting.
How can I verify Walter W. Chien, MD's license?
NPPES lists California license number G56242, 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 Walter W. Chien, MD prescribe under Medicare Part D?
In 2024, Walter W. Chien, MD had 29 Medicare Part D claims for 16 beneficiaries; the average among clinical cardiac electrophysiology physician prescribers was 1,710. Part D covers Medicare prescriptions only.
What is Walter W. Chien, MD's MIPS final score?
The 2023 MIPS final score is 96.5 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.