Ziad Wagih Chaya, D.O.
Internal Medicine Physician · Fountain Valley, CA
Ziad Wagih Chaya, D.O. is an internal medicine physician with a practice address in Fountain Valley, California, and NPI 1528420510, issued on Mar 28, 2016. Check the license (California 20A16384, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ziad Wagih Chaya
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A16384 CA
Self-reported in NPPES; status is on the state search - Practice location
- 17360 Brookhurst St, Fountain Valley, CA 92708
- Phone
- (657) 241-3592
- Enumerated
- Mar 28, 2016
- Record last updated
- Jul 15, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20190807001701); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 17360 Brookhurst St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Gail Frances Liezl Abcede, M.D.Internal Medicine Physician1902216872
- Dustin ArbuckleClinical Social Worker1528715547
- Behnaz Babaknia, PA-CPhysician Assistant1992275093
- Brett BatesStudent in an Organized Health Care Education/Training Program1609315134
- Gina Bell, M.D.Family Medicine Physician1750589032
- Michael Benefiel, M.D.Internal Medicine Physician1861855827
Verify Ziad Wagih Chaya in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A16384Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average internal medicine physician in 2024
245 Medicare Part D claims for 112 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Pantoprazole Sodium22 claims
- Amlodipine Besylate12 claims
- Atorvastatin Calcium11 claims
- Prednisone11 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 76.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Memorialcare Medical FoundationLaguna Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ziad Wagih Chaya among 17,696 internal medicine physician records in California
Ziad Wagih Chaya, D.O. 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 2016, is newer than 79% of them.
- NPI issued2016 · 79% of these records are older, 19% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2016 · median 2004 among the 11,065 with a school on file
- Record last updated2019 · 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).
83 internal medicine physician records list a practice address in Fountain Valley
They are 83 of the 2,190 NPPES records with a practice address in Fountain Valley, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Fountain Valley → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Joel Bartlett, MDFountain Valley, CA 927081073518791
- Ihong Chen, MDFountain Valley, CA 927081104822535
- Naomi Cheung, MDFountain Valley, CA 927081073503314
- Alan Dang, M.D.Fountain Valley, CA 927081043217359
- Alton ForanFountain Valley, CA 927081619968799
- George Hong, MDFountain Valley, CA 927081154328532
- Brandon Khaw, MDFountain Valley, CA 927081568453637
- Lalita Komanapalli, MDFountain Valley, CA 927081578560884
Common questions
What is Ziad Wagih Chaya, D.O.'s NPI number?
Ziad Wagih Chaya, D.O.'s National Provider Identifier (NPI) is 1528420510, issued on Mar 28, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Ziad Wagih Chaya, D.O. located?
The NPPES record lists a practice address at 17360 Brookhurst St, Fountain Valley, CA, 92708. Phone: (657) 241-3592. Providers update this record themselves, so call before visiting.
How can I verify Ziad Wagih Chaya, D.O.'s license?
NPPES lists California license number 20A16384, 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 Ziad Wagih Chaya, D.O. prescribe under Medicare Part D?
In 2024, Ziad Wagih Chaya, D.O. had 245 Medicare Part D claims for 112 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Ziad Wagih Chaya, D.O.'s MIPS final score?
The 2023 MIPS final score is 76.7 of 100, reported for the practice group. 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.