DR. JEFFREY SPENCER MD
NPI 1609876853
Anesthesiology in Mount Kisco, NY
About Dr. Jeffrey Spencer Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JEFFREY SPENCER MD (NPI 1609876853) is an individual anesthesiology provider in Mount Kisco, New York, licensed in New York (175558) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS and is a graduate of Vanderbilt University School Of Medicine (1987).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Jeffrey Spencer Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
4Medicare enrollment records show Jeffrey Spencer reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Mount Kisco, NY 10549
- Reassigned Medicare billing, Connecticut and New York enrollments
- Medicare enrollment name: Optum Medical Care PC
- 3 clinicians in this Medicare group
Chappaqua, NY 10514
- Reassigned Medicare billing, New York enrollment
- 1,406 clinicians in this Medicare group
Fairfield, CT 06824
- Reassigned Medicare billing, Connecticut enrollment
- 41 clinicians in this Medicare group
Bridgeport, CT 06610
- Reassigned Medicare billing, Connecticut enrollment
- 129 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MOUNT KISCO, NY 10549
MOUNT KISCO, NY 10549
MOUNT KISCO, NY 10549
MOUNT KISCO, NY 10549
MOUNT KISCO, NY 10549
MOUNT KISCO, NY 10549
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 Jeffrey Spencer's NPI number?
The NPI number for Jeffrey Spencer is 1609876853. It was assigned to this individual provider in the NPPES registry on July 29, 2005.
Where is Jeffrey Spencer located?
Jeffrey Spencer practices at 400 E Main St Northern Westchester Hospital, Mount Kisco, NY 10549. The listed phone number is (914) 666-1691.
What is Jeffrey Spencer's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Jeffrey Spencer enrolled in Medicare?
Yes. Jeffrey Spencer is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Jeffrey Spencer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jeffrey Spencer reassigns Medicare benefits to 4 organizations: Optum Medical Care, P.C. (Mount Kisco, NY), North Shore - Lij Anesthesiology, PC (Chappaqua, NY), Greater Connecticut Anesthesia Associates, LLC (Fairfield, CT) and Bridgeport Anesthesia Associates, P.C. (Bridgeport, CT). Each 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 Jeffrey Spencer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Jeffrey Spencer accept?
Health plans from Anthem Blue Cross and Blue Shield list Jeffrey Spencer 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 Jeffrey Spencer was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Dr. Jeffrey Spencer, MD · NPI 1609876853
Anesthesiology physician in Mount Kisco, New York. Individual provider, active in the CMS NPPES registry since July 29, 2005.
## Identity
- **NPI:** 1609876853 (Entity type: Individual)
- **Enumerated:** July 29, 2005
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 175558 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 400 E MAIN ST, NORTHERN WESTCHESTER HOSPITAL, Mount Kisco, NY 10549-3417
- **Phone:** (914) 666-1691
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Optum Medical Care, P.C. (NPI 1982643003, Mount Kisco, NY); North Shore - Lij Anesthesiology, PC (NPI 1417401266, Chappaqua, NY); Greater Connecticut Anesthesia Associates, LLC (NPI 1730837576, Fairfield, CT); Bridgeport Anesthesia Associates, P.C. (NPI 1174549257, Bridgeport, CT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Vanderbilt University School Of Medicine, class of 1987
## Record status
- **NPPES last updated:** July 13, 2026
- **Other identifiers:** Medicaid 01565008 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1609876853) · Data from the CMS NPPES public registry.