1. Home
  2. Directory
  3. Massachusetts
  4. Quincy
  5. Internal Medicine
  6. NPI Profile

GRANITE MEDICAL GROUP
NPI 1558756759
Internal Medicine in Quincy, MA

Active since April 03, 2015
500 CONGRESS ST, SUITE 3C, QUINCY, MA 02169(617) 471-0033(617) 770-4354 Get Directions Write a Review

NPPES record last updated: June 20, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Granite Medical Group NPPES

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

GRANITE MEDICAL GROUP (NPI 1558756759) is a healthcare organization registered as an internal medicine in Quincy, Massachusetts and active in the NPI registry since April 2015. The organization lists Steve Strongwater, President, as its authorized official.

NPPES Registry Identity

NPI1558756759
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameATRIUS HEALTH, INC.
Location Address500 CONGRESS ST, SUITE 3CQuincy, MA 02169-0908
Mailing Address275 Grove St, Suite 3-300Auburndale, MA 02466-2272 · (617) 559-8374
Phone(617) 471-0033
Fax(617) 770-4354
Organization SubpartNo
Authorized OfficialSteve StrongwaterPresident · (617) 559-8042
Enumeration DateApril 3, 2015
Last NPPES UpdateJune 20, 2022
NPPES CertifiedJune 20, 2022
✔ NPI 1558756759 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 10

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedDermatologyTaxonomy 207N00000X
Also ListedInternal Medicine · Cardiovascular DiseaseTaxonomy 207RC0000X
Also ListedInternal Medicine · Endocrinology, Diabetes & MetabolismTaxonomy 207RE0101X
Also ListedInternal Medicine · GastroenterologyTaxonomy 207RG0100X
Also ListedInternal Medicine · Geriatric MedicineTaxonomy 207RG0300X
Also ListedInternal Medicine · Interventional CardiologyTaxonomy 207RI0011X
Also ListedInternal Medicine · Pulmonary DiseaseTaxonomy 207RP1001X
Also ListedInternal Medicine · RheumatologyTaxonomy 207RR0500X
Also ListedRadiology · Diagnostic RadiologyTaxonomy 2085R0202X
500 CONGRESS ST, Quincy, MA 02169
Open in Google Maps ↗

Other Names 1

Doing Business AsGranite Medical Group

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Granite Medical Group is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

1,316

Medicare enrollment records show 1,316 clinicians reassign Medicare billing to Granite Medical Group, which bills Medicare for the services they deliver. Of these, 9 practice at this address and 551 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 51

Nurse Practitioner387
Internal Medicine189
Pediatric Medicine123
Obstetrics/Gynecology59
Family Practice58
Physical Therapist in Private Practice45
Diagnostic Radiology35
Cardiovascular Disease (Cardiology)29
43 other specialties391

Nearest to this location (20)

See all 1,316
Leslie-Ann Alexander, M.D.
Internal Medicine
NPI 1922445675
500 CONGRESS ST
Quincy, MA 02169
(617) 376-6600
✔ PECOS✔ Accepts MedicareSame address
David Dobroski, M.D.
Internal Medicine
NPI 1588646061
500 CONGRESS ST SUITE 3A
Quincy, MA 02169
(617) 471-0033
✔ PECOS✔ Accepts MedicareSame address
John Lazor, M.D.
General Surgery
NPI 1821089921
500 CONGRESS ST SUITE 2B
Quincy, MA 02169
(617) 774-1717
✔ PECOS✔ Accepts MedicareSame address
Cecilia Mullen, NURSE PRACTIONER
Nurse Practitioner
NPI 1538160684
500 CONGRESS ST
Quincy, MA 02169
(617) 471-0033
✔ PECOS✔ Accepts MedicareSame address
Maura Mulvey
Nurse Practitioner
NPI 1750923322
500 CONGRESS ST STE 3C
Quincy, MA 02169
(617) 376-6600
✔ PECOS✔ Accepts MedicareSame address
Elisa Valente, M.D.
Gastroenterology
NPI 1316999683
500 CONGRESS ST SUITE 3C
Quincy, MA 02169
(617) 471-0033
✔ PECOS✔ Accepts MedicareSame address
Alan Wong, M.D., M.P.H.
Gastroenterology
NPI 1740418466
500 CONGRESS ST STE 3A
Quincy, MA 02169
(617) 471-0033
✔ PECOS✔ Accepts MedicareSame address
Matthew Zawasky, M.D.
Internal Medicine
NPI 1841669256
500 CONGRESS ST STE 3C
Quincy, MA 02169
(617) 471-0033
✔ PECOS✔ Accepts MedicareSame address
Jana Shumate
Nurse Practitioner
NPI 1215610415
500 CONGRESS ST
Quincy, MA 02169
(508) 524-0497
✔ PECOS✔ Accepts MedicareSame address
Xinping Ren, M.D.
Internal Medicine
NPI 1275665135
700 CONGRESS ST SUITE 301
Quincy, MA 02169
(617) 479-4450
✔ PECOS✔ Accepts Medicare0.1 mi
Madison Flint
Nurse Practitioner
NPI 1306596606
21 TOTMAN STREET SUITE 2
Quincy, MA 02169
(617) 745-0050
✔ PECOS0.1 mi
Michelle Morse, DPM
Podiatry
NPI 1528402070
54 MILLER ST SUITE 201
Quincy, MA 02169
(617) 481-3710
✔ PECOS✔ Accepts Medicare0.8 mi
Shuchi Gupta, MD
Family Practice
NPI 1487642732
54 MILLER ST SUITE 300
Quincy, MA 02169
(617) 481-3300
✔ PECOS✔ Accepts Medicare0.8 mi
David Cunningham, DPT
Physical Therapist in Private Practice
NPI 1407158769
150 PARKINGWAY SUITE 2
Quincy, MA 02169
(617) 770-2224
✔ Accepts Medicare1.1 mi
Bruno West, MD
Diagnostic Radiology
NPI 1720286073
114 WHITWELL ST RADIOLOGY DEPT
Quincy, MA 02169
(617) 638-6610
✔ PECOS✔ Accepts Medicare1.1 mi
Renee Aversano, MD
Internal Medicine
NPI 1962402255
10 FORBES RD STE 190
Braintree, MA 02184
(781) 884-6300
✔ PECOS✔ Accepts Medicare1.3 mi
Caitlin Polillio, NP
Nurse Practitioner
NPI 1508083213
1250 HANCOCK ST
Quincy, MA 02169
(617) 421-2686
✔ PECOS✔ Accepts Medicare1.4 mi
Julia Bender Stern, MD
Pediatric Medicine
NPI 1568044691
1250 HANCOCK ST
Quincy, MA 02169
(617) 774-0660
✔ PECOS1.4 mi
Rajiv Nauth
Qualified Audiologist
NPI 1205729191
1250 HANCOCK ST
Quincy, MA 02169
(617) 774-0600
✔ Accepts Medicare1.4 mi
Thomas Parrish, DO
Family Practice
NPI 1669823100
1250 HANCOCK ST
Quincy, MA 02169
(617) 774-0840
✔ PECOS✔ Accepts Medicare1.4 mi
See all 1,316 clinicians

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Atrius Health, Inc.'s NPI number?

The NPI number for Atrius Health, Inc. is 1558756759. It was assigned to this organization in the NPPES registry on April 3, 2015. The provider is doing business as Granite Medical Group.

Where is Atrius Health, Inc. located?

Atrius Health, Inc. is located at 500 Congress St Suite 3C, Quincy, MA 02169. The listed phone number is (617) 471-0033.

What is Atrius Health, Inc.'s specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Atrius Health, Inc. enrolled in Medicare?

Yes. Atrius Health, Inc. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Atrius Health, Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 1,316 clinicians in 51 Medicare specialties reassign their Medicare billing to Atrius Health, Inc.. A 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 the clinician's services. The largest specialties are Nurse Practitioner (387), Internal Medicine (189) and Pediatric Medicine (123). Of these, 9 practice at this address and 551 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Atrius Health, Inc. was last updated on June 20, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.