ALYSSA GILLEGO M.D.
NPI 1659567352
Surgery in Greenwich, CT
About Alyssa Gillego M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALYSSA GILLEGO M.D. (NPI 1659567352) is an individual surgery provider in Greenwich, Connecticut, licensed in Connecticut (056739) and active in the NPI registry since September 2007. She is enrolled in Medicare PECOS and is a graduate of Other (2001).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 5
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
Alyssa Gillego M.d. 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
3Medicare enrollment records show Alyssa Gillego reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Greenwich, CT 06830
- Reassigned Medicare billing, Connecticut enrollment
- Medicare enrollment name: Northeast Medical Group Inc
- 1,824 clinicians in this Medicare group
Greenwich, CT 06830
- Reassigned Medicare billing, Connecticut enrollment
- 268 clinicians in this Medicare group
New Haven, CT 06519
- Reassigned Medicare billing, Connecticut enrollment
- 3,728 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 3
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06830 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Alyssa Gillego's NPI number?
The NPI number for Alyssa Gillego is 1659567352. It was assigned to this individual provider in the NPPES registry on September 18, 2007.
Where is Alyssa Gillego located?
Alyssa Gillego practices at 77 Lafayette Pl Ste 302, Greenwich, CT 06830. The listed phone number is (203) 863-4250.
What is Alyssa Gillego's specialty?
The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.
Is Alyssa Gillego enrolled in Medicare?
Yes. Alyssa Gillego 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 Alyssa Gillego's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alyssa Gillego reassigns Medicare benefits to 3 organizations: Mill Hill Medical Consultants Inc (Greenwich, CT), Greenwich Hospital (Greenwich, CT) and Yale University (New Haven, 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 Alyssa Gillego's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Alyssa Gillego accept?
Health plans from Anthem Blue Cross and Blue Shield list Alyssa Gillego 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 Alyssa Gillego was last updated on November 13, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Alyssa Gillego, M.D. · NPI 1659567352
Surgery physician in Greenwich, Connecticut. Individual provider, active in the CMS NPPES registry since September 18, 2007.
## Identity
- **NPI:** 1659567352 (Entity type: Individual)
- **Enumerated:** September 18, 2007
- **Primary specialty:** Surgery · taxonomy 208600000X
- **State license:** 056739 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 77 LAFAYETTE PL STE 302, Greenwich, CT 06830-5426
- **Phone:** (203) 863-4250 · **Fax:** (203) 863-4249
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Mill Hill Medical Consultants Inc (NPI 1245249549, Greenwich, CT); Greenwich Hospital (NPI 1609846088, Greenwich, CT); Yale University (NPI 1124148887, New Haven, CT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2001
## Record status
- **NPPES last updated:** November 13, 2017
- **Other identifiers:** Other P4055272; Other 090923000071; Medicaid 390200000X (NY); and 2 more
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Source: [NPI Profile](https://npiprofile.com/npi/1659567352) · Data from the CMS NPPES public registry.