William H. Metzger, MD
Gastroenterology Physician · Orange, CA
William H. Metzger, MD is a gastroenterology physician with a practice address in Orange, California, and NPI 1629040308, issued on Feb 6, 2006. Check the license (California G21079, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William H. Metzger
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G21079 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1010 W LA Veta Ave, Orange, CA 92868
- Phone
- (714) 835-7700
- Enumerated
- Feb 6, 2006
- Record last updated
- Sep 3, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (714) 835-8145
- Medicaid ID
- 0G2107900 CA
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 1010 W LA Veta Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alaa Abousaif, MDGastroenterology Physician1235124108
- Gurpreet Ahuja, MDOtolaryngology Physician1013970169
- Tyler Ayalin, M.D.Emergency Medicine Physician1124274915
- Birbal Bhaskar, M.D.Specialist1194773168
- Michele Carpenter, M.D.Specialist1770543712
- Daniel ChiuGerontology Nurse Practitioner1427419530
Verify William H. Metzger in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G21079Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average gastroenterology physician in 2024
31 Medicare Part D claims, against an average of 811 among the 16,445 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.
William H. Metzger among 2,140 gastroenterology physician records in California
William H. Metzger, MD is one of 2,140 gastroenterology physician records with a practice address in California. 83% 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, 48% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2014 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Orange → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Alaa Abousaif, MDOrange, CA 928681235124108
- William Collins, MDOrange, CA 928681104892074
- Jessica Hung, M.D.Orange, CA 928681396786323
- William Karnes, MDOrange, CA 928681881652998
- James Lee, MDOrange, CA 928681750358735
- Robert Lee, M.D.Orange, CA 928681669583530
- John Lee, MDOrange, CA 928681487734521
- Haig Najarian, MDOrange, CA 928681912010257
Common questions
What is William H. Metzger, MD's NPI number?
William H. Metzger, MD's National Provider Identifier (NPI) is 1629040308, issued on Feb 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William H. Metzger, MD located?
The NPPES record lists a practice address at 1010 W LA Veta Ave, Orange, CA, 92868. Phone: (714) 835-7700. Providers update this record themselves, so call before visiting.
How can I verify William H. Metzger, MD's license?
NPPES lists California license number G21079, 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 William H. Metzger, MD prescribe under Medicare Part D?
In 2024, William H. Metzger, MD had 31 Medicare Part D claims; the average among gastroenterology physician prescribers was 811. 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.