MARGARET MULLEN
NPI 1023393683
Social Worker - Clinical in Richmond, CA
About Margaret Mullen NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET MULLEN (NPI 1023393683) is an individual clinical provider in Richmond, California, licensed in California (71768) and active in the NPI registry since October 2011. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Margaret Mullen is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Margaret Mullen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Richmond, CA 94801
- Reassigned Medicare billing, California enrollment
- 20,078 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 94801 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Mullen's NPI number?
The NPI number for Margaret Mullen is 1023393683. It was assigned to this individual provider in the NPPES registry on October 14, 2011.
Where is Margaret Mullen located?
Margaret Mullen practices at 901 Nevin Ave, Richmond, CA 94801. The listed phone number is (510) 307-1771.
What is Margaret Mullen's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Margaret Mullen enrolled in Medicare?
Yes. Margaret Mullen is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Margaret Mullen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Mullen reassigns Medicare benefits to Permanente Medical Group Inc (Richmond, 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 Mullen'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 Mullen was last updated on February 11, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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 Mullen · NPI 1023393683
Clinical provider in Richmond, California. Individual provider, active in the CMS NPPES registry since October 14, 2011.
## Identity
- **NPI:** 1023393683 (Entity type: Individual)
- **Enumerated:** October 14, 2011
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** 71768 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 901 NEVIN AVE, Richmond, CA 94801-3143
- **Phone:** (510) 307-1771 · **Fax:** (510) 307-1615
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for durable medical equipment
- **Bills Medicare through:** Permanente Medical Group Inc (NPI 1235226531, Richmond, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 11, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1023393683) · Data from the CMS NPPES public registry.