MARGARET ZIMMERMAN MD
NPI 1073502282
Pediatrics in Fountain Valley, CA
About Margaret Zimmerman Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET ZIMMERMAN MD (NPI 1073502282) is an individual pediatrics provider in Fountain Valley, California, licensed in California (A86963) and active in the NPI registry since October 2005. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
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 (PECOS)
Margaret Zimmerman Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Margaret Zimmerman reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Fountain Valley, CA 92708
- Reassigned Medicare billing, California enrollment
- 948 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92708 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
FOUNTAIN VALLEY, CA 92708
FOUNTAIN VALLEY, CA 92708
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 Margaret Zimmerman's NPI number?
The NPI number for Margaret Zimmerman is 1073502282. It was assigned to this individual provider in the NPPES registry on October 19, 2005.
Where is Margaret Zimmerman located?
Margaret Zimmerman practices at 18785 Brookhurst St., Suite 200, Fountain Valley, CA 92708. The listed phone number is (714) 378-5330.
What is Margaret Zimmerman's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Margaret Zimmerman enrolled in Medicare?
Yes. Margaret Zimmerman is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Margaret Zimmerman's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Zimmerman reassigns Medicare benefits to Memorialcare Medical Foundation (Fountain Valley, 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 Margaret Zimmerman'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 Margaret Zimmerman was last updated on June 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Margaret Zimmerman, MD · NPI 1073502282
Pediatrics physician in Fountain Valley, California. Individual provider, active in the CMS NPPES registry since October 19, 2005.
## Identity
- **NPI:** 1073502282 (Entity type: Individual)
- **Enumerated:** October 19, 2005
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** A86963 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 18785 BROOKHURST ST., SUITE 200, Fountain Valley, CA 92708
- **Phone:** (714) 378-5330 · **Fax:** (657) 276-4743
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Memorialcare Medical Foundation (NPI 1205167350, Fountain Valley, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** June 11, 2026
- **Other identifiers:** Medicaid 00A869630 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1073502282) · Data from the CMS NPPES public registry.