SOUTHERN ILLINOIS ASSOCIATES LLC
NPI 1962427856
Psychiatry & Neurology - Psychiatry in Maryville, IL
About Southern Illinois Associates Llc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SOUTHERN ILLINOIS ASSOCIATES LLC (NPI 1962427856) is a healthcare organization registered as a psychiatry in Maryville, Illinois and active in the NPI registry since July 2006. The organization holds a CLIA Waiver certificate valid through May 24, 2027 and lists Sanjay Nigam, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Group Practice 1
Accepted Insurance
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)
Southern Illinois Associates Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by January 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
18Medicare enrollment records show 18 clinicians reassign Medicare billing to Southern Illinois Associates LLC, which bills Medicare for the services they deliver. Of these, 16 practice at this address and 17 within 10 miles. They are listed nearest first.
Clinicians by Medicare Specialty 4
Clinicians, nearest first (18)
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 14D2225919
Southern Illinois Associates LLC · Maryville, ILFrequently 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 Southern Illinois Associates LLC's NPI number?
The NPI number for Southern Illinois Associates LLC is 1962427856. It was assigned to this organization in the NPPES registry on July 13, 2006.
Where is Southern Illinois Associates LLC located?
Southern Illinois Associates LLC is located at 6805 State Route 162 Ste 201, Maryville, IL 62062. The listed phone number is (618) 288-5019.
What is Southern Illinois Associates LLC's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.
Is Southern Illinois Associates LLC enrolled in Medicare?
Yes. Southern Illinois Associates LLC is registered in the Medicare PECOS enrollment system.
When is Southern Illinois Associates LLC'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 (Illinois, Clinic/Group Practice) is due for revalidation by January 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 Southern Illinois Associates LLC?
According to the CMS Revalidation Reassignment List (October 2026 release), 18 clinicians in 4 Medicare specialties reassign their Medicare billing to Southern Illinois Associates LLC. 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 Nurse Practitioner (11), Clinical Social Worker (3) and Mental Health Counselor (2). Of these, 16 practice at this address and 17 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Southern Illinois Associates LLC hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 14D2225919) is associated with this NPI, valid through May 24, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
What insurance does Southern Illinois Associates LLC accept?
Health plans from Anthem Blue Cross and Blue Shield and Medica list Southern Illinois Associates LLC as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Southern Illinois Associates LLC was last updated on April 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Southern Illinois Associates Llc · NPI 1962427856
Psychiatry organization in Maryville, Illinois. Organization record, active in the CMS NPPES registry since July 13, 2006.
## Identity
- **NPI:** 1962427856 (Entity type: Organization)
- **Enumerated:** July 13, 2006
- **Primary specialty:** Psychiatry & Neurology - Psychiatry · taxonomy 2084P0800X
- **Organization subpart:** No
- **Authorized official:** Sanjay Nigam, PRESIDENT
## Practice location
- **Address:** 6805 STATE ROUTE 162 STE 201, Maryville, IL 62062-8530
- **Phone:** (618) 288-5019 · **Fax:** (618) 288-5059
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** January 31, 2027 (Non-DME Part B, Illinois, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 18 clinicians in 4 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Nurse Practitioner (11), Clinical Social Worker (3), Mental Health Counselor (2); 16 practice at this address and 17 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 6, 2026
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1962427856) · Data from the CMS NPPES public registry.