FIRST VALLEY MEDICAL GROUP
NPI 1235567124
Internal Medicine in Lancaster, CA
About First Valley Medical Group NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
FIRST VALLEY MEDICAL GROUP (NPI 1235567124) is a healthcare organization registered as an internal medicine in Lancaster, California and active in the NPI registry since October 2013. The organization holds a CLIA Waiver certificate valid through August 25, 2028 and lists Kanagaratnam Sivalingam, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
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)
First Valley Medical Group is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by February 28, 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
5Medicare enrollment records show 5 clinicians reassign Medicare billing to First Valley Medical Group, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 2 within 10 miles. They are listed nearest first.
Clinicians, nearest first (5)
Lancaster, CA 93534
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 05D2117961
First Valley Medical Group · Lancaster, 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 Sivalingam Medical Corporation, Inc.'s NPI number?
The NPI number for Sivalingam Medical Corporation, Inc. is 1235567124. It was assigned to this organization in the NPPES registry on October 31, 2013. The provider is doing business as First Valley Medical Group.
Where is Sivalingam Medical Corporation, Inc. located?
Sivalingam Medical Corporation, Inc. is located at 44725 10th St W Suite 170, Lancaster, CA 93534. The listed phone number is (661) 726-3058.
What is Sivalingam Medical Corporation, Inc.'s specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Sivalingam Medical Corporation, Inc. enrolled in Medicare?
Yes. Sivalingam Medical Corporation, Inc. is registered in the Medicare PECOS enrollment system.
When is Sivalingam Medical Corporation, Inc.'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 February 28, 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 Sivalingam Medical Corporation, Inc.?
According to the CMS Revalidation Reassignment List (October 2026 release), 5 clinicians reassign their Medicare billing to Sivalingam Medical Corporation, Inc., in Family Practice, General Practice, Internal Medicine and Nurse Practitioner. 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. Of these, 1 practice at this address and 2 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Sivalingam Medical Corporation, Inc. hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 05D2117961) is associated with this NPI, valid through August 25, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Sivalingam Medical Corporation, Inc. was last updated on March 17, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# First Valley Medical Group · NPI 1235567124
Internal Medicine organization in Lancaster, California. Organization record, active in the CMS NPPES registry since October 31, 2013.
## Identity
- **NPI:** 1235567124 (Entity type: Organization)
- **Enumerated:** October 31, 2013
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **Legal business name:** Sivalingam Medical Corporation, Inc.
- **Organization subpart:** No
- **Authorized official:** Kanagaratnam Sivalingam, PRESIDENT
## Practice location
- **Address:** 44725 10TH ST W, SUITE 170, Lancaster, CA 93534-3033
- **Phone:** (661) 726-3058 · **Fax:** (661) 726-3723
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** February 28, 2027 (Non-DME Part B, California, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 5 clinicians in 4 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Family Practice (2), General Practice (1), Internal Medicine (1); 1 practice at this address and 2 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** March 17, 2023
- **Other identifiers:** Medicaid 00A300910 (CA)
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1235567124) · Data from the CMS NPPES public registry.