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GREGORY MARCELLIN FNP-BC
NPI 1881060861
Nurse Practitioner - Family in Boston, MA

Active since August 13, 2015PECOS Enrolled
1601 WASHINGTON ST, BOSTON, MA 02118(617) 425-2000 Get Directions Write a Review

NPPES record last updated: November 16, 2023. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Nov 16, 2023, Oct 11, 2016 (2 updates tracked since 2016).

About Gregory Marcellin Fnp-bc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GREGORY MARCELLIN FNP-BC (NPI 1881060861) is an individual family provider in Boston, Massachusetts, licensed in Massachusetts (RN2290802) and active in the NPI registry since August 2015. He is enrolled in Medicare PECOS and maintains a secondary practice location in Stratham.

NPPES Registry Identity

NPI1881060861
Entity TypeIndividualMale
Primary Taxonomy363LF0000X
Provider Legal NameGREGORY MARCELLINCredential: FNP-BC
Location Address1601 WASHINGTON STBoston, MA 02118-1951
Mailing Address14 Dyer AveEverett, MA 02149-1201 · (857) 869-0318
Phone(617) 425-2000
Sole ProprietorNo
Enumeration DateAugust 13, 2015
Last NPPES UpdateNovember 16, 20232 updates tracked since enumeration
NPPES CertifiedNovember 16, 2023
✔ NPI 1881060861 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
Licenses✔ Licensed in MA · RN2290802✔ Licensed in CT · 6225
1601 WASHINGTON ST, Boston, MA 02118
Open in Google Maps ↗

Secondary Practice Location 1

Location 11 Portsmouth AveStratham, NH 03885-2585 · Phone (603) 772-3600 · Fax (603) 772-3601

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Harvard Pilgrim Health Care.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Gregory Marcellin Fnp-bc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Gregory Marcellin reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Convenientmd - Ffs Uc LLC
7.9 mi
Urgent Care
479 WASHINGTON ST
Quincy, MA 02169
  • Reassigned Medicare billing, Massachusetts and New Hampshire enrollments
  • Also billed through NPI 1730870171 (New Hampshire)
  • 135 clinicians in this Medicare group
NPI 1063103448 (857) 529-5220

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 02118 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$97.64 typical visit price
range $63.72 – $189.86
Typical copayment $24.41 (range $15.93 – $47.46)
Most-billed visit code 99203
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

NICAURY VICTORIA SUAZO ORTIZ RN
Registered Nurse
1601 WASHINGTON ST
BOSTON, MA 02118
Suffolk County (617) 425-2000
CHELSEY CUTTING
Social Worker
1601 WASHINGTON ST
BOSTON, MA 02118
Suffolk County (617) 425-2000
KAYLA FLYNN CNP
Nurse Practitioner (Psychiatric/Mental Health)
1601 WASHINGTON ST
BOSTON, MA 02118
Suffolk County (617) 425-2000
SARI R KALIN M.S., R.D., L.D.N.
Nutritionist
1601 WASHINGTON ST
BOSTON, MA 02118
Suffolk County (617) 425-2000
MILAGROS MARIA AVALO RN
Registered Nurse
1601 WASHINGTON ST
BOSTON, MA 02118
Suffolk County (617) 425-2000
CATRINA MARIE MURPHY CNP
Nurse Practitioner (Family)
1601 WASHINGTON ST
BOSTON, MA 02118
Suffolk County (617) 425-2000
ALISON NOONE MSW
Social Worker
1601 WASHINGTON ST
BOSTON, MA 02118
Suffolk County (617) 425-2000
AIDA PALENCIA
Registered Nurse (Community Health)
1601 WASHINGTON ST
BOSTON, MA 02118
Suffolk County (617) 425-2000

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 Gregory Marcellin's NPI number?

The NPI number for Gregory Marcellin is 1881060861. It was assigned to this individual provider in the NPPES registry on August 13, 2015.

Where is Gregory Marcellin located?

Gregory Marcellin practices at 1601 Washington St, Boston, MA 02118. The listed phone number is (617) 425-2000.

What is Gregory Marcellin's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Gregory Marcellin enrolled in Medicare?

Yes. Gregory Marcellin is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Gregory Marcellin's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Marcellin reassigns Medicare benefits to Convenientmd - Ffs Uc LLC (Quincy, MA). 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 Gregory Marcellin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Gregory Marcellin accept?

Health plans from Harvard Pilgrim Health Care list Gregory Marcellin 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 Gregory Marcellin was last updated on November 16, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.