OBSERVATION UNIT
NPI 1457789075
Emergency Medicine in Mount Kisco, NY
About Observation Unit NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
OBSERVATION UNIT (NPI 1457789075) is a healthcare organization registered as an emergency medicine in Mount Kisco, New York and active in the NPI registry since October 2013. The organization lists John Partenza, Cfo, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 3
Other Names 1
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)
Observation Unit is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by November 30, 2026
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
76Medicare enrollment records show 76 clinicians reassign Medicare billing to Observation Unit, which bills Medicare for the services they deliver. Of these, 22 practice at this address and 37 within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 16
Nearest to this location (20)
See all 76Mount Kisco, NY 10549
Mount Kisco, NY 10549
Mount Kisco, NY 10549
Mount Kisco, NY 10549
Mount Kisco, NY 10549
Mount Kisco, NY 10549
Mount Kisco, NY 10549
Mount Kisco, NY 10549
Mount Kisco, NY 10549
Mount Kisco, NY 10549
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 Northern Westchester Hospital Association's NPI number?
The NPI number for Northern Westchester Hospital Association is 1457789075. It was assigned to this organization in the NPPES registry on October 16, 2013. The provider is also known as Observation Unit.
Where is Northern Westchester Hospital Association located?
Northern Westchester Hospital Association is located at 400 East Main Street 4th Floor, Mount Kisco, NY 10549. The listed phone number is (914) 666-1200.
What is Northern Westchester Hospital Association's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Northern Westchester Hospital Association enrolled in Medicare?
Yes. Northern Westchester Hospital Association is registered in the Medicare PECOS enrollment system.
When is Northern Westchester Hospital Association'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 (New York, Clinic/Group Practice) is due for revalidation by November 30, 2026. 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 Northern Westchester Hospital Association?
According to the CMS Revalidation Reassignment List (October 2026 release), 76 clinicians in 16 Medicare specialties reassign their Medicare billing to Northern Westchester Hospital Association. 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 Emergency Medicine (18), Nurse Practitioner (10) and Internal Medicine (8). Of these, 22 practice at this address and 37 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
What insurance does Northern Westchester Hospital Association accept?
Health plans from Florida Blue (BlueCross BlueShield FL) and Florida Blue HMO (a BlueCross BlueShield FL company) list Northern Westchester Hospital Association 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 Northern Westchester Hospital Association was last updated on October 16, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Observation Unit · NPI 1457789075
Emergency Medicine organization in Mount Kisco, New York. Organization record, active in the CMS NPPES registry since October 16, 2013.
## Identity
- **NPI:** 1457789075 (Entity type: Organization)
- **Enumerated:** October 16, 2013
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **Legal business name:** Northern Westchester Hospital Association
- **Organization subpart:** Yes (part of Northern Westchester Hospital Association)
- **Authorized official:** John Partenza, CFO
## Practice location
- **Address:** 400 EAST MAIN STREET, 4TH FLOOR, Mount Kisco, NY 10549-0000
- **Phone:** (914) 666-1200 · **Fax:** (914) 666-1965
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** November 30, 2026 (Non-DME Part B, New York, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 76 clinicians in 16 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Emergency Medicine (18), Nurse Practitioner (10), Internal Medicine (8); 22 practice at this address and 37 within 10 miles; [full list](https://npiprofile.com/npi/1457789075/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 16, 2013
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Source: [NPI Profile](https://npiprofile.com/npi/1457789075) · Data from the CMS NPPES public registry.