Gregory Marcellin, FNP-BC
NPI 1881060861 · Family Nurse Practitioner · Boston, MA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Marcellin, FNP-BC is a Family Nurse Practitioner provider in Boston, MA (NPI 1881060861).
Provider details
- NPI number
- 1881060861
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-BC
- Sex
- Male
- Sole proprietor
- No
- License
- 6225 (CT)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
10 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 1 Portsmouth AveStratham, NH 03885-2585Phone: (603) 772-3600Fax: (603) 772-3601
Registry dates
- Enumerated
- 2015-08-13
- Last updated
- 2023-11-16
- Certified
- 2023-11-16
Frequently asked questions
- What is Gregory Marcellin's NPI number?
- Gregory Marcellin's National Provider Identifier (NPI) is 1881060861, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Marcellin's specialty?
- Gregory Marcellin is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Gregory Marcellin located?
- Gregory Marcellin's practice location on file with NPPES is 1601 Washington St, Boston, MA 02118-1951.
- What is Gregory Marcellin's phone number?
- The practice phone number listed in the NPPES registry for Gregory Marcellin is (617) 425-2000.
- Does Gregory Marcellin accept Medicare?
- Gregory Marcellin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Marcellin's NPI active?
- Yes — Gregory Marcellin's NPI (1881060861) is active in the NPPES registry as of the last update on 2023-11-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.