SQUARE MEDICAL GROUP LLC
NPI 1356515464
Clinic/Center - Adult Mental Health in Watertown, MA
About Square Medical Group Llc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SQUARE MEDICAL GROUP LLC (NPI 1356515464) is a healthcare organization registered as an adult mental health in Watertown, Massachusetts and active in the NPI registry since April 2008. The organization holds a CLIA Waiver certificate valid through September 14, 2027 and lists Natalie Leonid Lender, Medical Director, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Square Medical Group Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
27Medicare enrollment records show 27 clinicians reassign Medicare billing to Square Medical Group LLC, which bills Medicare for the services they deliver. Of these, 5 practice at this address and 16 within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 5
Nearest to this location (20)
See all 27Cambridge, MA 02139
Boston, MA 02111
Salem, MA 01907
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 22D2236133
Square Medical Group - River House · Waltham, 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 Square Medical Group LLC's NPI number?
The NPI number for Square Medical Group LLC is 1356515464. It was assigned to this organization in the NPPES registry on April 18, 2008.
Where is Square Medical Group LLC located?
Square Medical Group LLC is located at 124 Watertown St Suite 2D, Watertown, MA 02472. The listed phone number is (617) 916-5069.
What is Square Medical Group LLC's specialty?
The primary specialty registered for this NPI is Clinic/Center, specializing in Adult Mental Health, with taxonomy code 261QM0850X.
Is Square Medical Group LLC enrolled in Medicare?
Yes. Square Medical Group LLC is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Square Medical Group LLC?
According to the CMS Revalidation Reassignment List (October 2026 release), 27 clinicians in 5 Medicare specialties reassign their Medicare billing to Square 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. The largest specialties are Nurse Practitioner (15), Psychiatry (8) and Clinical Social Worker (2). Of these, 5 practice at this address and 16 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Square Medical Group LLC hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 22D2236133) is associated with this NPI, valid through September 14, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
What insurance does Square Medical Group LLC accept?
Health plans from Anthem Blue Cross and Blue Shield and Harvard Pilgrim Health Care list Square 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 Square Medical Group LLC was last updated on August 13, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Square Medical Group Llc · NPI 1356515464
Adult Mental Health organization in Watertown, Massachusetts. Organization record, active in the CMS NPPES registry since April 18, 2008.
## Identity
- **NPI:** 1356515464 (Entity type: Organization)
- **Enumerated:** April 18, 2008
- **Primary specialty:** Clinic/Center - Adult Mental Health · taxonomy 261QM0850X
- **Organization subpart:** No
- **Authorized official:** Natalie Lender, MEDICAL DIRECTOR, OWNER
## Practice location
- **Address:** 124 WATERTOWN ST, SUITE 2D, Watertown, MA 02472-2576
- **Phone:** (617) 916-5069 · **Fax:** (617) 467-4073
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 27 clinicians in 5 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Nurse Practitioner (15), Psychiatry (8), Clinical Social Worker (2); 5 practice at this address and 16 within 10 miles; [full list](https://npiprofile.com/npi/1356515464/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 13, 2015
- **Other identifiers:** Medicare UPIN G56508; Medicaid 3173615 (MA)
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1356515464) · Data from the CMS NPPES public registry.