Robert I. Katzen, M.D.
Family Medicine Physician · Fountain Valley, CA
Robert I. Katzen, M.D. is a family medicine physician with a practice address in Fountain Valley, California, and NPI 1376552174, issued on Aug 8, 2006. Check the license (California G31016, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert I. Katzen
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G31016 CA
Self-reported in NPPES; status is on the state search - Practice location
- 18785 Brookhurst St, Fountain Valley, CA 92708
- Phone
- (714) 378-5330
- Enumerated
- Aug 8, 2006
- Record last updated
- May 25, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (714) 378-5320
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 18785 Brookhurst St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Valerie Riddle, LCSWClinical Social Worker1033962907
- Eden Yawata, D.O.Family Medicine Physician1588643969
Verify Robert I. Katzen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G31016Check 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 family medicine physician in 2024
56 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Zolpidem Tartrate13 claims
- Trazodone Hcl11 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: $55.00
1 payment: food and beverage; the largest payer was Boston Scientific Corporation. 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.
Robert I. Katzen among 17,133 family medicine physician records in California
Robert I. Katzen, M.D. 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 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2016 · 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 Robert I. Katzen, M.D.'s NPI number?
Robert I. Katzen, M.D.'s National Provider Identifier (NPI) is 1376552174, issued on Aug 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert I. Katzen, M.D. located?
The NPPES record lists a practice address at 18785 Brookhurst St, Fountain Valley, CA, 92708. Phone: (714) 378-5330. Providers update this record themselves, so call before visiting.
How can I verify Robert I. Katzen, M.D.'s license?
NPPES lists California license number G31016, 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 Robert I. Katzen, M.D. prescribe under Medicare Part D?
In 2024, Robert I. Katzen, M.D. had 56 Medicare Part D claims; 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.