MICHAEL A KATZ MD
NPI 1841213899
Internal Medicine in Fullerton, CA
About Michael A Katz Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MICHAEL A KATZ MD (NPI 1841213899) is an individual internal medicine provider in Fullerton, California, licensed in California (A77114) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Orange, and is a graduate of University Of Arizona College Of Medicine (2000).
NPPES Registry Identity
Specialties & Licenses 5
Secondary Practice Location 1
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Michael A Katz Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Michael Katz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Brea, CA 92821
- Reassigned Medicare billing, California enrollment
- 1,699 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92835 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
FULLERTON, CA 92835
FULLERTON, CA 92835
FULLERTON, CA 92835
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Michael Katz's NPI number?
The NPI number for Michael Katz is 1841213899. It was assigned to this individual provider in the NPPES registry on July 25, 2006.
Where is Michael Katz located?
Michael Katz practices at 101 E Valencia Mesa Dr, Fullerton, CA 92835. The listed phone number is (714) 992-3969.
What is Michael Katz's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Michael Katz enrolled in Medicare?
Yes. Michael Katz is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Michael Katz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Katz reassigns Medicare benefits to Providence Medical Foundation (Brea, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Michael Katz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Michael Katz was last updated on May 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Michael A Katz, MD · NPI 1841213899
Internal Medicine physician in Fullerton, California. Individual provider, active in the CMS NPPES registry since July 25, 2006.
## Identity
- **NPI:** 1841213899 (Entity type: Individual)
- **Enumerated:** July 25, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A77114 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 E VALENCIA MESA DR, Fullerton, CA 92835-3809
- **Phone:** (714) 992-3969 · **Fax:** (714) 992-3169
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Providence Medical Foundation (NPI 1871607762, Brea, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Arizona College Of Medicine, class of 2000
## Record status
- **NPPES last updated:** May 6, 2026
- **Other identifiers:** Medicaid 00A771140 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1841213899) · Data from the CMS NPPES public registry.