DR. JOYCE GIAMMATTEI DRPH, RD, CDE
NPI 1194861450
Dietitian, Registered - Nutrition, Metabolic in Sonoma, CA
About Dr. Joyce Giammattei Drph, Rd, Cde NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOYCE GIAMMATTEI DRPH, RD, CDE (NPI 1194861450) is an individual nutrition, metabolic provider in Sonoma, California, licensed in California (818435) and active in the NPI registry since January 2007.
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. Joyce Giammattei Drph, Rd, Cde is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Joyce Giammattei reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Santa Rosa, CA 95405
- Reassigned Medicare billing, California enrollment
- 4 clinicians in this Medicare group
Orinda, CA 94563
- Reassigned Medicare billing, California enrollment
- 4,479 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 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SONOMA, CA 95476
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 Joyce Giammattei's NPI number?
The NPI number for Joyce Giammattei is 1194861450. It was assigned to this individual provider in the NPPES registry on January 30, 2007.
Where is Joyce Giammattei located?
Joyce Giammattei practices at 430 W Napa St Ste F, Sonoma, CA 95476. The listed phone number is (707) 939-6070.
What is Joyce Giammattei's specialty?
The primary specialty registered for this NPI is Dietitian, Registered, specializing in Nutrition, Metabolic, with taxonomy code 133VN1006X.
Is Joyce Giammattei enrolled in Medicare?
Yes. Joyce Giammattei is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Joyce Giammattei's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Joyce Giammattei reassigns Medicare benefits to 2 organizations: Northern California Center For Well-Being (Santa Rosa, CA) and Sutter Bay Medical Foundation (Orinda, CA). Each 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 Joyce Giammattei'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 Joyce Giammattei was last updated on July 13, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Dr. Joyce Giammattei, DRPH, RD, CDE · NPI 1194861450
Nutrition, Metabolic provider in Sonoma, California. Individual provider, active in the CMS NPPES registry since January 30, 2007.
## Identity
- **NPI:** 1194861450 (Entity type: Individual)
- **Enumerated:** January 30, 2007
- **Primary specialty:** Dietitian, Registered - Nutrition, Metabolic · taxonomy 133VN1006X
- **State license:** 818435 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 430 W NAPA ST STE F, Sonoma, CA 95476-6545
- **Phone:** (707) 939-6070
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Northern California Center For Well-Being (NPI 1962587964, Santa Rosa, CA); Sutter Bay Medical Foundation (NPI 1366898538, Orinda, CA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 13, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1194861450) · Data from the CMS NPPES public registry.