JASON L GREENBAUM MD
NPI 1649205493
Emergency Medicine in Stamford, CT
About Jason L Greenbaum Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JASON L GREENBAUM MD (NPI 1649205493) is an individual emergency medicine provider in Stamford, Connecticut, licensed in Connecticut (44305) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Heywood Hospital, and is a graduate of Other (2002).
NPPES Registry Identity
Specialties & Licenses
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
Jason L Greenbaum 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
10Medicare enrollment records show Jason Greenbaum reassigns Medicare billing to 10 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10029
- Reassigned Medicare billing, New York enrollment
- 623 clinicians in this Medicare group
Waterbury, CT 06708
- Reassigned Medicare billing, Connecticut enrollment
- 83 clinicians in this Medicare group
Meriden, CT 06451
- Reassigned Medicare billing, Connecticut enrollment
- 505 clinicians in this Medicare group
Meriden, CT 06451
- Reassigned Medicare billing, Connecticut enrollment
- 96 clinicians in this Medicare group
Torrington, CT 06790
- Reassigned Medicare billing, Connecticut enrollment
- 374 clinicians in this Medicare group
New Britain, CT 06052
- Reassigned Medicare billing, Connecticut enrollment
- 745 clinicians in this Medicare group
Willimantic, CT 06226
- Reassigned Medicare billing, Connecticut enrollment
- 302 clinicians in this Medicare group
Willimantic, CT 06226
- Reassigned Medicare billing, Connecticut enrollment
- 104 clinicians in this Medicare group
Athol, MA 01331
- Reassigned Medicare billing, Massachusetts enrollment
- 324 clinicians in this Medicare group
Gardner, MA 01440
- Reassigned Medicare billing, Massachusetts enrollment
- 344 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Heywood Hospital
Acute Care Hospitals · Gardner, MAAthol Memorial Hospital
Critical Access Hospitals · Athol, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06902 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
STAMFORD, CT 06902
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 Jason Greenbaum's NPI number?
The NPI number for Jason Greenbaum is 1649205493. It was assigned to this individual provider in the NPPES registry on July 11, 2006.
Where is Jason Greenbaum located?
Jason Greenbaum practices at 30 Shelburne Rd, Stamford, CT 06902. The listed phone number is (330) 493-4443.
What is Jason Greenbaum's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Jason Greenbaum enrolled in Medicare?
Yes. Jason Greenbaum 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 Jason Greenbaum's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jason Greenbaum reassigns Medicare benefits to 10 organizations: Metropolitan Medical Practice Plan PC (New York, NY), Nems W LLC (Waterbury, CT), Midstate Medical Center (Meriden, CT), Nems PLLC (Meriden, CT), The Charlotte Hungerford Hospital (Torrington, CT) and 5 more organizations, listed in the Medicare section above. 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 Jason Greenbaum's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Jason Greenbaum accept?
Health plans from Cigna Healthcare and Taro Health list Jason Greenbaum 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.
Is Jason Greenbaum affiliated with any hospitals?
According to CMS data, Jason Greenbaum is affiliated with Heywood Hospital and Athol Memorial Hospital.
When was this NPI record last updated?
The NPPES record for Jason Greenbaum was last updated on April 21, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Jason L Greenbaum, MD · NPI 1649205493
Emergency Medicine physician in Stamford, Connecticut. Individual provider, active in the CMS NPPES registry since July 11, 2006.
## Identity
- **NPI:** 1649205493 (Entity type: Individual)
- **Enumerated:** July 11, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 44305 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 30 SHELBURNE RD, Stamford, CT 06902-3628
- **Phone:** (330) 493-4443 · **Fax:** (330) 493-8677
## 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:** 10 organizations under Medicare reassignment (form CMS-855R): Metropolitan Medical Practice Plan PC (NPI 1306138383, New York, NY); Nems W LLC (NPI 1760325666, Waterbury, CT); Midstate Medical Center (NPI 1154425288, Meriden, CT); Nems PLLC (NPI 1114482882, Meriden, CT); The Charlotte Hungerford Hospital (NPI 1629075734, Torrington, CT); and 5 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2002
## Record status
- **NPPES last updated:** April 21, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1649205493) · Data from the CMS NPPES public registry.