MS. MARY CECILIA SULLIVAN MSN, APRN
NPI 1861628893
Nurse Practitioner - Family in Stamford, CT
About Ms. Mary Cecilia Sullivan Msn, Aprn NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. MARY CECILIA SULLIVAN MSN, APRN (NPI 1861628893) is an individual family provider in Stamford, Connecticut, licensed in Connecticut (001625) and active in the NPI registry since June 2009. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Ms. Mary Cecilia Sullivan Msn, Aprn is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Mary Sullivan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Hawthorne, NY 10532
- Reassigned Medicare billing, New York enrollment
- 511 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06926 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
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Mary Sullivan's NPI number?
The NPI number for Mary Sullivan is 1861628893. It was assigned to this individual provider in the NPPES registry on June 4, 2009.
Where is Mary Sullivan located?
Mary Sullivan practices at 1 Elmcroft Rd, Stamford, CT 06926. The listed phone number is (203) 351-7700.
What is Mary Sullivan's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Mary Sullivan enrolled in Medicare?
Yes. Mary Sullivan is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Mary Sullivan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Sullivan reassigns Medicare benefits to Boston Children's Health Physicians, LLP (Hawthorne, NY). The 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 Mary Sullivan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mary Sullivan was last updated on June 4, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.
# Ms. Mary Cecilia Sullivan, MSN, APRN · NPI 1861628893
Family physician in Stamford, Connecticut. Individual provider, active in the CMS NPPES registry since June 4, 2009.
## Identity
- **NPI:** 1861628893 (Entity type: Individual)
- **Enumerated:** June 4, 2009
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 001625 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 ELMCROFT RD, Stamford, CT 06926-0700
- **Phone:** (203) 351-7700
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Boston Children's Health Physicians, LLP (NPI 1467454967, Hawthorne, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** June 4, 2009
---
Source: [NPI Profile](https://npiprofile.com/npi/1861628893) · Data from the CMS NPPES public registry.