MASON STREET INDUSTRIES LLC
NPI 1215805536
Psychiatry & Neurology - Neurology in Greenwich, CT
About Mason Street Industries Llc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MASON STREET INDUSTRIES LLC (NPI 1215805536) is a healthcare organization registered as a neurology in Greenwich, Connecticut and active in the NPI registry since October 2025. The organization lists David Hahn, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mason Street Industries Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Mason Street Industries 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.
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 Mason Street Industries LLC's NPI number?
The NPI number for Mason Street Industries LLC is 1215805536. It was assigned to this organization in the NPPES registry on October 28, 2025.
Where is Mason Street Industries LLC located?
Mason Street Industries LLC is located at 115 Mason St Ste 1, Greenwich, CT 06830. The listed phone number is (718) 514-0224.
What is Mason Street Industries LLC's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.
Is Mason Street Industries LLC enrolled in Medicare?
Yes. Mason Street Industries LLC is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Mason Street Industries LLC?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Neurology) reassigns their Medicare billing to Mason Street Industries 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.
When was this NPI record last updated?
The NPPES record for Mason Street Industries LLC was last updated on October 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Mason Street Industries Llc · NPI 1215805536
Neurology organization in Greenwich, Connecticut. Organization record, active in the CMS NPPES registry since October 28, 2025.
## Identity
- **NPI:** 1215805536 (Entity type: Organization)
- **Enumerated:** October 28, 2025
- **Primary specialty:** Psychiatry & Neurology - Neurology · taxonomy 2084N0400X
- **Organization subpart:** No
- **Authorized official:** David Hahn, PRESIDENT
## Practice location
- **Address:** 115 MASON ST STE 1, Greenwich, CT 06830-6630
- **Phone:** (718) 514-0224
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 1 clinician (Neurology) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 28, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1215805536) · Data from the CMS NPPES public registry.