Michael A. Katz, MD
Internal Medicine Physician · Fullerton, CA
Michael A. Katz, MD is an internal medicine physician with a practice address in Fullerton, California, and NPI 1841213899, issued on Jul 25, 2006. Check the license (California A77114, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael A. Katz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A77114 CA
Self-reported in NPPES; status is on the state search - Practice location
- 101 E Valencia Mesa Dr, Fullerton, CA 92835
- Phone
- (714) 992-3969
- Enumerated
- Jul 25, 2006
- Record last updated
- May 6, 2026
- Fax
- (714) 992-3169
- Medicaid ID
- 00A771140 CA
- Medicare enrollment
- Enrolled (PECOS I20040122001050); accepts Medicare assignment
- Medical or professional school
- University Of Arizona College Of Medicine, 2000
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 101 E Valencia Mesa Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sora Ahn, RNCritical Care Medicine Registered Nurse1730026493
- Sherry Ansari, DPTPhysical Medicine & Rehabilitation Physician1467972992
- Tandeep Bains, PHARM.D.Pharmacist1568958114
Verify Michael A. Katz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A77114Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $204.50
7 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Providence Medical FoundationFullerton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael A. Katz among 17,696 internal medicine physician records in California
Michael A. Katz, MD 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2000 · median 2004 among the 11,065 with a school on file
- Record last updated2026 · 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).
44 internal medicine physician records list a practice address in Fullerton
They are 44 of the 5,437 NPPES records with a practice address in Fullerton, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Fullerton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rajiv Bhavsar, M.D.Fullerton, CA 928351477550648
- Bradley Borsari, MDFullerton, CA 928351104826619
- Eugene BostonFullerton, CA 928351023019965
- Ruben Cabral, MDFullerton, CA 928351568458008
- Friedhelm Cordes, M.D.Fullerton, CA 928351588650931
- Robert Francis, M.D.Fullerton, CA 928351366439804
- Leo Garcia, M.D.Fullerton, CA 928351831185792
- Pius Kim, M.D.Fullerton, CA 928351003863317
Common questions
What is Michael A. Katz, MD's NPI number?
Michael A. Katz, MD's National Provider Identifier (NPI) is 1841213899, issued on Jul 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael A. Katz, MD located?
The NPPES record lists a practice address at 101 E Valencia Mesa Dr, Fullerton, CA, 92835. Phone: (714) 992-3969. Providers update this record themselves, so call before visiting.
How can I verify Michael A. Katz, MD's license?
NPPES lists California license number A77114, 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.
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.