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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

GREGORY DEMETRIOS KARELAS
NPI 1548958770
Student in an Organized Health Care Education/Training Program in Boston, MA

Active since April 26, 2023
300 LONGWOOD AVE, BOSTON, MA 02115(617) 355-6624(617) 730-0335 Get Directions Write a Review

NPPES record last updated: July 15, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Gregory Demetrios Karelas NPPES

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

GREGORY DEMETRIOS KARELAS (NPI 1548958770) is an individual student in an organized health care education/training program in Boston, Massachusetts and active in the NPI registry since April 2023.

NPPES Registry Identity

NPI1548958770
Entity TypeIndividualMale
Primary Taxonomy390200000X
Provider Legal NameGREGORY DEMETRIOS KARELAS
Location Address300 LONGWOOD AVEBoston, MA 02115-5724
Mailing Address300 Longwood AveBoston, MA 02115-5724 · (617) 355-6624 · Fax (617) 730-0335
Phone(617) 355-6624
Fax(617) 730-0335
Sole ProprietorNo
Enumeration DateApril 26, 2023
Last NPPES UpdateJuly 15, 2026
NPPES CertifiedJuly 15, 2026
✔ NPI 1548958770 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyStudent in an Organized Health Care Education/Training ProgramStudent, Health Care
Taxonomy Code390200000X
Definition
An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.
300 LONGWOOD AVE, Boston, MA 02115
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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.

JULIE ANN HANSEN LCSW
Social Worker (Clinical)
300 LONGWOOD AVE
BOSTON, MA 02115
Suffolk County (857) 218-4309
MS. ANNA ROGLIERI
Nurse Practitioner (Psychiatric/Mental Health)
300 LONGWOOD AVE
BOSTON, MA 02115
Suffolk County (617) 355-6000
STEPHEN G. FLYNN M.D.
Anesthesiology (Pediatric Anesthesiology)
300 LONGWOOD AVE
BOSTON, MA 02115
Suffolk County (617) 355-6000
MISS LAUREN ASHLEY MASTERSON P.T., D.P.T
Physical Therapist
300 LONGWOOD AVE
BOSTON, MA 02115
Suffolk County (617) 355-7216
MS. SOYUN KWAN LICSW
Social Worker (Clinical)
300 LONGWOOD AVE, CHILDREN'S HOSPITAL BOSTON
BOSTON, MA 02115
Suffolk County (617) 355-0567
PUJA BANKA M.D.
Pediatrics
300 LONGWOOD AVE, BADER 203
BOSTON, MA 02115
Suffolk County (617) 355-6363
MR. COURTNEY SULLIVAN FRATTO CPNP
Nurse Practitioner (Pediatrics)
300 LONGWOOD AVE, HUNNEWELL BUILDING 322
BOSTON, MA 02115
Suffolk County (857) 218-4085
DR. ELIZABETH S TAGLAUER M.D., PH.D.
Pediatrics (Neonatal-Perinatal Medicine)
300 LONGWOOD AVE
BOSTON, MA 02115
Suffolk County (617) 355-6000

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 Karelas's NPI number?

The NPI number for Gregory Karelas is 1548958770. It was assigned to this individual provider in the NPPES registry on April 26, 2023.

Where is Gregory Karelas located?

Gregory Karelas practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-6624.

What is Gregory Karelas's specialty?

The primary specialty registered for this NPI is Student in an Organized Health Care Education/Training Program with taxonomy code 390200000X.

When was this NPI record last updated?

The NPPES record for Gregory Karelas was last updated on July 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 days 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.