MARISSA ANNE SYLVIA FNP
NPI 1609746940
Nurse Practitioner - Family in Boston, MA
About Marissa Anne Sylvia Fnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARISSA ANNE SYLVIA FNP (NPI 1609746940) is an individual family provider in Boston, Massachusetts, licensed in Massachusetts (RN2314857) and active in the NPI registry since November 2025. She is enrolled in Medicare PECOS, is affiliated with Boston Children's Hospital, and is a graduate of Other (2024).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Marissa Anne Sylvia Fnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Marissa Sylvia reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 1,358 clinicians in this Medicare group
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 77 clinicians in this Medicare group
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 109 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Boston Children's Hospital
Childrens · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02115 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.
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
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 Marissa Sylvia's NPI number?
The NPI number for Marissa Sylvia is 1609746940. It was assigned to this individual provider in the NPPES registry on November 11, 2025.
Where is Marissa Sylvia located?
Marissa Sylvia practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-6000.
What is Marissa Sylvia's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Marissa Sylvia enrolled in Medicare?
Yes. Marissa Sylvia is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Marissa Sylvia's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marissa Sylvia reassigns Medicare benefits to 3 organizations: Children's Hospital Pediatric Associates, Inc (Boston, MA), Children's Hospital Radiology Foundation, Inc. (Boston, MA) and Chmc Surgical Foundation Inc (Boston, MA). 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 Marissa Sylvia's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Marissa Sylvia affiliated with any hospitals?
According to CMS data, Marissa Sylvia is affiliated with Boston Children's Hospital.
When was this NPI record last updated?
The NPPES record for Marissa Sylvia was last updated on February 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Marissa Anne Sylvia, FNP · NPI 1609746940
Family physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since November 11, 2025.
## Identity
- **NPI:** 1609746940 (Entity type: Individual)
- **Enumerated:** November 11, 2025
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** RN2314857 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 LONGWOOD AVE, Boston, MA 02115-5724
- **Phone:** (617) 355-6000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Children's Hospital Pediatric Associates, Inc (NPI 1457306664, Boston, MA); Children's Hospital Radiology Foundation, Inc. (NPI 1487681912, Boston, MA); Chmc Surgical Foundation Inc (NPI 1902977515, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2024
## Record status
- **NPPES last updated:** February 18, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1609746940) · Data from the CMS NPPES public registry.