MATHEW DUFFEY
NPI 1003457151
Marriage & Family Therapist in Yuba City, CA
About Mathew Duffey NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MATHEW DUFFEY (NPI 1003457151) is an individual marriage & family therapist in Yuba City, California, licensed in California (156206) and active in the NPI registry since September 2019. He 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)
Mathew Duffey is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Mathew Duffey reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Grass Valley, CA 95945
- Reassigned Medicare billing, California enrollment
- 27 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.
Other Providers at the Same Location NPPES 7
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 Mathew Duffey's NPI number?
The NPI number for Mathew Duffey is 1003457151. It was assigned to this individual provider in the NPPES registry on September 30, 2019.
Where is Mathew Duffey located?
Mathew Duffey practices at 1103 Butte House Rd, Yuba City, CA 95991. The listed phone number is (530) 913-7221.
What is Mathew Duffey's specialty?
The primary specialty registered for this NPI is Marriage & Family Therapist with taxonomy code 106H00000X.
Is Mathew Duffey enrolled in Medicare?
Yes. Mathew Duffey is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Mathew Duffey's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mathew Duffey reassigns Medicare benefits to Sierra Family Therapy Centers, Inc. (Grass 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 Mathew Duffey'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 Mathew Duffey was last updated on July 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Mathew Duffey · NPI 1003457151
Marriage & Family Therapist provider in Yuba City, California. Individual provider, active in the CMS NPPES registry since September 30, 2019.
## Identity
- **NPI:** 1003457151 (Entity type: Individual)
- **Enumerated:** September 30, 2019
- **Primary specialty:** Marriage & Family Therapist · taxonomy 106H00000X
- **State license:** 156206 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1103 BUTTE HOUSE RD, Yuba City, CA 95991-3109
- **Phone:** (530) 913-7221
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Sierra Family Therapy Centers, Inc. (NPI 1336648385, Grass Valley, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 21, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1003457151) · Data from the CMS NPPES public registry.