Catherine Van Nguyen-Loh, DO
Family Medicine Physician · Fountain Valley, CA
Catherine Van Nguyen-Loh, DO is a family medicine physician with a practice address in Fountain Valley, California, and NPI 1558828848, issued on Feb 22, 2019. Check the license (California 20A20201, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Catherine Van Nguyen-Loh
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A20201 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8970 Warner Ave, Fountain Valley, CA 92708
- Phone
- (714) 477-8400
- Enumerated
- Feb 22, 2019
- Record last updated
- Mar 5, 2024
- Fax
- (714) 477-8401
- Medicare enrollment
- Enrolled (PECOS I20230424000964); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 8970 Warner Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Afdal Allam, M.D.Family Medicine Physician1053486605
- Marcus Angulo, N.PFamily Nurse Practitioner1124486568
- Sharmeline Curameng, MSN, FNPFamily Nurse Practitioner1891116588
- Long Hua, MDInternal Medicine Physician1376046185
- Kevin Schachter, MDFamily Medicine Physician1013411636
Verify Catherine Van Nguyen-Loh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A20201Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
47% fewer Medicare Part D claims than the average family medicine physician in 2024
1,868 Medicare Part D claims for 238 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium177 claims
- Losartan Potassium113 claims
- Levothyroxine Sodium107 claims
- Amlodipine Besylate75 claims
- Alendronate Sodium50 claims
- Pantoprazole Sodium42 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.
Industry payments in 2024: $29.01
1 payment: food and beverage; the largest payer was Lilly USA, LLC. The 55,478 providers of this specialty with any payment received $902.55 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
- Hoag ClinicSan Clemente, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine Van Nguyen-Loh among 17,133 family medicine physician records in California
Catherine Van Nguyen-Loh, DO is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 85% of them.
- NPI issued2019 · 85% of these records are older, 12% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2019 · median 2005 among the 10,652 with a school on file
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
51 family medicine physician records list a practice address in Fountain Valley
They are 51 of the 2,190 NPPES records with a practice address in Fountain Valley, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Fountain Valley → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Arfa Babaknia, M.D.Fountain Valley, CA 927081205826849
- Hung-Chuan Cheng, M.D.Fountain Valley, CA 927081053389023
- Brian Coyne, M.D.Fountain Valley, CA 927081457306334
- Nasrin Damoui, MDFountain Valley, CA 927081841295326
- Robert Devereaux, MDFountain Valley, CA 927081043264781
- David Dunckel, MDFountain Valley, CA 927081518957794
- Edgar Fernandez, DOFountain Valley, CA 927081033157235
- Jo Lieberman Pan, MDFountain Valley, CA 927081598756090
Common questions
What is Catherine Van Nguyen-Loh, DO's NPI number?
Catherine Van Nguyen-Loh, DO's National Provider Identifier (NPI) is 1558828848, issued on Feb 22, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Van Nguyen-Loh, DO located?
The NPPES record lists a practice address at 8970 Warner Ave, Fountain Valley, CA, 92708. Phone: (714) 477-8400. Providers update this record themselves, so call before visiting.
How can I verify Catherine Van Nguyen-Loh, DO's license?
NPPES lists California license number 20A20201, 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 Catherine Van Nguyen-Loh, DO prescribe under Medicare Part D?
In 2024, Catherine Van Nguyen-Loh, DO had 1,868 Medicare Part D claims for 238 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.