William Loi Ngo, DO
Geriatric Medicine (Family Medicine) Physician · Garden Grove, CA
William Loi Ngo, DO is a geriatric medicine (family medicine) physician with a practice address in Garden Grove, California, and NPI 1932161189, issued on Apr 4, 2006. Check the license (California 20A6015, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Loi Ngo
- Credential
- DO
- Primary taxonomy
- Geriatric Medicine (Family Medicine) Physician 207QG0300X
- License number
- 20A6015 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8342 Garden Grove Blvd Ste 5, Garden Grove, CA 92844
- Phone
- (714) 590-4899
- Enumerated
- Apr 4, 2006
- Record last updated
- May 16, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (714) 590-1833
- Medicaid ID
- 20A6015 CA
- Medicare enrollment
- Enrolled (PECOS I20050915000375); accepts Medicare assignment
- Medical or professional school
- College Of Osteo Med Of The Pacific At Pomona, 1990
- Entity
- Type 1 · individual
8 nearest geriatric medicine (family medicine) physician records → All 243 in California → Look up another NPI →
Verify William Loi Ngo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A6015Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% fewer Medicare Part D claims than the average geriatric medicine (family medicine) physician in 2024
1,293 Medicare Part D claims for 85 beneficiaries, against an average of 5,222 among the 1,271 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Atorvastatin Calcium79 claims
- Amlodipine Besylate76 claims
- Metformin Hcl61 claims
- Alendronate Sodium49 claims
- Benazepril Hcl48 claims
- Amoxicillin43 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.
William Loi Ngo among 243 geriatric medicine (family medicine) physician records in California
William Loi Ngo, DO is one of 243 geriatric medicine (family medicine) physician records with a practice address in California. 76% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 53% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 46% of these records are
- Graduated1990 · median 2004 among the 111 with a school on file
- Record last updated2008 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Family Medicine) Physician providers in California
There are 243 geriatric medicine (family medicine) physician records in California.
All 243 in California → Every provider in Garden Grove → Geriatric Medicine (Family Medicine) Physician nationwide →
The 8 geriatric medicine (family medicine) physician records with the nearest ZIP codes
- Phuc Lam, MDGarden Grove, CA 928431518930197
- Joey Wong, D.O.Orange, CA 928671699126730
- Nagina Abdiani, DOOrange, CA 928681518543271
- Edna Biddy, M.D.Orange, CA 928681407295702
- Bhavana Gandotra, MDOrange, CA 928681891971156
- Renee Pace, MDOrange, CA 928681629423512
- Neetu Bhola, M.D.Anaheim, CA 928071427345503
- William Ford, MDAnaheim, CA 928071407927460
Common questions
What is William Loi Ngo, DO's NPI number?
William Loi Ngo, DO's National Provider Identifier (NPI) is 1932161189, issued on Apr 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Loi Ngo, DO located?
The NPPES record lists a practice address at 8342 Garden Grove Blvd Ste 5, Garden Grove, CA, 92844. Phone: (714) 590-4899. Providers update this record themselves, so call before visiting.
How can I verify William Loi Ngo, DO's license?
NPPES lists California license number 20A6015, 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 Loi Ngo, DO prescribe under Medicare Part D?
In 2024, William Loi Ngo, DO had 1,293 Medicare Part D claims for 85 beneficiaries; the average among geriatric medicine (family medicine) physician prescribers was 5,222. 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.