DR. KATHERINE E WALKER MD
NPI 1437101177
Family Medicine in Sonoma, CA
About Dr. Katherine E Walker Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KATHERINE E WALKER MD (NPI 1437101177) is an individual family medicine provider in Sonoma, California, licensed in California (G69445) and active in the NPI registry since May 2006. 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)
Dr. Katherine E Walker Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Katherine Walker reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Eldridge, CA 95431
- Reassigned Medicare billing, California enrollment
- 69 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 95431 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 3
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.
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 Katherine Walker's NPI number?
The NPI number for Katherine Walker is 1437101177. It was assigned to this individual provider in the NPPES registry on May 17, 2006.
Where is Katherine Walker located?
Katherine Walker practices at 15000 Arnold Drive, Sonoma, CA 95431. The listed phone number is (707) 938-6556.
What is Katherine Walker's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Katherine Walker enrolled in Medicare?
Yes. Katherine Walker is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Katherine Walker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Katherine Walker reassigns Medicare benefits to State Of California - Department Of Developmental Services (Eldridge, 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 Katherine Walker'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 Katherine Walker was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Dr. Katherine E Walker, MD · NPI 1437101177
Family Medicine physician in Sonoma, California. Individual provider, active in the CMS NPPES registry since May 17, 2006.
## Identity
- **NPI:** 1437101177 (Entity type: Individual)
- **Enumerated:** May 17, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** G69445 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 15000 ARNOLD DRIVE, Sonoma, CA 95431-1493
- **Phone:** (707) 938-6556
## 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:** State Of California - Department Of Developmental Services (NPI 1851344220, Eldridge, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 13, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1437101177) · Data from the CMS NPPES public registry.