LEENA S RAY MD
NPI 1679574693
Internal Medicine - Nephrology in Concord, CA
About Leena S Ray Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LEENA S RAY MD (NPI 1679574693) is an individual nephrology provider in Concord, California, licensed in California (A84526) and active in the NPI registry since August 2005. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 6
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Leena S Ray Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Leena Ray reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- 810 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 94520 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 4
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 Leena Ray's NPI number?
The NPI number for Leena Ray is 1679574693. It was assigned to this individual provider in the NPPES registry on August 2, 2005.
Where is Leena Ray located?
Leena Ray practices at 2222 East Street Ste 305, Concord, CA 94520. The listed phone number is (925) 686-1230.
What is Leena Ray's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is Leena Ray enrolled in Medicare?
Yes. Leena Ray is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Leena Ray's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leena Ray reassigns Medicare benefits to John Muir Trauma Physicians Billing Service (Walnut Creek, 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 Leena Ray'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 Leena Ray was last updated on June 25, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.
# Leena S Ray, MD · NPI 1679574693
Nephrology physician in Concord, California. Individual provider, active in the CMS NPPES registry since August 2, 2005.
## Identity
- **NPI:** 1679574693 (Entity type: Individual)
- **Enumerated:** August 2, 2005
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **State license:** A84526 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2222 EAST STREET, STE 305, Concord, CA 94520-2066
- **Phone:** (925) 686-1230 · **Fax:** (925) 686-8443
## 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:** John Muir Trauma Physicians Billing Service (NPI 1962551861, Walnut Creek, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** June 25, 2008
- **Other identifiers:** Medicare ID-Type Unspecified 00A845260; Other CP2044; Medicaid GR0020610 (CA); and 3 more
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Source: [NPI Profile](https://npiprofile.com/npi/1679574693) · Data from the CMS NPPES public registry.