NEPHROLOGY ASSOCIATES
NPI 1063462950
Specialist in Santa Rosa, CA
About Nephrology Associates NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NEPHROLOGY ASSOCIATES (NPI 1063462950) is a healthcare organization registered as a specialist in Santa Rosa, California and active in the NPI registry since May 2006. The organization holds a CLIA Waiver certificate valid through December 19, 2026 and lists Letty Ramirez, Office Manager/administrator, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Nephrology Associates is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by March 31, 2027
Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.
Clinicians Billing Medicare Through This Organization
12Medicare enrollment records show 12 clinicians reassign Medicare billing to Nephrology Associates, which bills Medicare for the services they deliver. Of these, 8 practice at this address. They are listed nearest first.
Clinicians by Medicare Specialty 3
Clinicians, nearest first (12)
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 05D1035052
Nephrology Associates Medical Office · Santa Rosa, CAFrequently 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 Nephrology Associates's NPI number?
The NPI number for Nephrology Associates is 1063462950. It was assigned to this organization in the NPPES registry on May 11, 2006.
Where is Nephrology Associates located?
Nephrology Associates is located at 2301 Circadian Way Suite A, Santa Rosa, CA 95407. The listed phone number is (707) 526-2027.
What is Nephrology Associates's specialty?
The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.
Is Nephrology Associates enrolled in Medicare?
Yes. Nephrology Associates is registered in the Medicare PECOS enrollment system.
When is Nephrology Associates's Medicare revalidation due?
According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (California, Clinic/Group Practice) is due for revalidation by March 31, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.
How many clinicians bill Medicare through Nephrology Associates?
According to the CMS Revalidation Reassignment List (October 2026 release), 12 clinicians in 3 Medicare specialties reassign their Medicare billing to Nephrology Associates. A 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 the clinician's services. The largest specialties are Nephrology (10), Nurse Practitioner (1) and Registered Dietitian or Nutrition Professional (1). Of these, 8 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Nephrology Associates hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 05D1035052) is associated with this NPI, valid through December 19, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Nephrology Associates was last updated on May 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Nephrology Associates · NPI 1063462950
Specialist organization in Santa Rosa, California. Organization record, active in the CMS NPPES registry since May 11, 2006.
## Identity
- **NPI:** 1063462950 (Entity type: Organization)
- **Enumerated:** May 11, 2006
- **Primary specialty:** Specialist · taxonomy 174400000X
- **Organization subpart:** No
- **Authorized official:** Letty Ramirez, OFFICE MANAGER/ADMINISTRATOR
## Practice location
- **Address:** 2301 CIRCADIAN WAY, SUITE A, Santa Rosa, CA 95407-5416
- **Phone:** (707) 526-2027 · **Fax:** (707) 526-2096
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** March 31, 2027 (Non-DME Part B, California, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 12 clinicians in 3 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Nephrology (10), Nurse Practitioner (1), Registered Dietitian or Nutrition Professional (1); 8 practice at this address · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** May 19, 2026
- **Other identifiers:** Medicaid GR0058950 (CA)
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1063462950) · Data from the CMS NPPES public registry.