CORNERSTONE MEDICAL GROUP, LLC
NPI 1366797771
Clinic/Center - Primary Care in Brookline, MA
About Cornerstone Medical Group, Llc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CORNERSTONE MEDICAL GROUP, LLC (NPI 1366797771) is a healthcare organization registered as a primary care in Brookline, Massachusetts and active in the NPI registry since July 2012. The organization holds a CLIA Waiver certificate valid through January 23, 2027 and lists Jonathan R Blumberg, Manager, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
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)
Cornerstone Medical Group, 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
Medicare enrollment records show 1 clinician reassigns Medicare billing to Cornerstone Medical Group, LLC, which bills Medicare for the services this clinician delivers.
Clinician (1)
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 22D2053051
Cornerstone Medical Group LLC · Brookline, MAFrequently 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 Cornerstone Medical Group, LLC's NPI number?
The NPI number for Cornerstone Medical Group, LLC is 1366797771. It was assigned to this organization in the NPPES registry on July 23, 2012.
Where is Cornerstone Medical Group, LLC located?
Cornerstone Medical Group, LLC is located at 1101 Beacon St Suite 2 West, Brookline, MA 02446. The listed phone number is (617) 775-7804.
What is Cornerstone Medical Group, LLC's specialty?
The primary specialty registered for this NPI is Clinic/Center, specializing in Primary Care, with taxonomy code 261QP2300X.
Is Cornerstone Medical Group, LLC enrolled in Medicare?
Yes. Cornerstone Medical Group, LLC is registered in the Medicare PECOS enrollment system.
When is Cornerstone Medical Group, 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 (Massachusetts, 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 Cornerstone Medical Group, LLC?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Cornerstone Medical Group, 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Cornerstone Medical Group, LLC hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 22D2053051) is associated with this NPI, valid through January 23, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
What insurance does Cornerstone Medical Group, LLC accept?
Health plans from Anthem Blue Cross and Blue Shield list Cornerstone Medical Group, 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 Cornerstone Medical Group, LLC was last updated on July 23, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Cornerstone Medical Group, Llc · NPI 1366797771
Primary Care organization in Brookline, Massachusetts. Organization record, active in the CMS NPPES registry since July 23, 2012.
## Identity
- **NPI:** 1366797771 (Entity type: Organization)
- **Enumerated:** July 23, 2012
- **Primary specialty:** Clinic/Center - Primary Care · taxonomy 261QP2300X
- **Organization subpart:** No
- **Authorized official:** Jonathan Blumberg, MANAGER
## Practice location
- **Address:** 1101 BEACON ST, SUITE 2 WEST, Brookline, MA 02446-5587
- **Phone:** (617) 775-7804
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** January 31, 2027 (Non-DME Part B, Massachusetts, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 1 clinician (Internal Medicine) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 23, 2012
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1366797771) · Data from the CMS NPPES public registry.