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HARBOR VIEW MEDICAL SERVICES PC
NPI 1306631742
Internal Medicine in Port Jefferson, NY

Active since April 14, 2025
125 OAKLAND AVE STE 204, PORT JEFFERSON, NY 11777(631) 686-2526 Get Directions Write a Review

NPPES record last updated: April 14, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Harbor View Medical Services Pc NPPES

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

HARBOR VIEW MEDICAL SERVICES PC (NPI 1306631742), doing business as Mather Medical Group, is a healthcare organization registered as an internal medicine in Port Jefferson, New York and active in the NPI registry since April 2025. The organization maintains 13 additional practice locations and lists Sharlene Bronstorph, Director, as its authorized official.

NPPES Registry Identity

NPI1306631742
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameHARBOR VIEW MEDICAL SERVICES PC
Location Address125 OAKLAND AVE STE 204Port Jefferson, NY 11777-2130
Mailing Address125 Oakland Ave Ste 204Port Jefferson, NY 11777-2130 · (631) 686-2526
Phone(631) 686-2526
Organization SubpartNo
Authorized OfficialSharlene BronstorphDirector · (516) 719-5755
Enumeration DateApril 14, 2025
NPPES CertifiedApril 14, 2025
✔ NPI 1306631742 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ 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.
125 OAKLAND AVE STE 204, Port Jefferson, NY 11777
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Other Names 1

Doing Business AsMather Medical Group

Secondary Practice Locations 13

Location 170 N Country Rd Ste 102Port Jefferson, NY 11777-2161 · Phone (631) 686-2526
Location 2210 Bellemeade RdEast Setauket, NY 11733-3522 · Phone (631) 686-2526
Location 3125 Oakland Ave Ste 203Port Jefferson, NY 11777-2130 · Phone (631) 686-2526
Location 4625 Belle Terre RdPort Jefferson, NY 11777-2316 · Phone (631) 686-2526
Location 570 N Country Rd Ste 101Port Jefferson, NY 11777-2161 · Phone (631) 686-2526
Location 675 N Country Rd Ste 1001Port Jefferson, NY 11777-2119 · Phone (631) 686-2526
Location 73 Technology Dr Ste 100East Setauket, NY 11733-4046 · Phone (631) 686-2526
Location 8745 Route 25A Ste ARocky Point, NY 11778-6603 · Phone (631) 686-2526
Location 92500 Nesconset Hwy Bldg 2Stony Brook, NY 11790-2555 · Phone (631) 686-2526
Location 101500 Route 112 Ste APort Jefferson Station, NY 11776-8055 · Phone (631) 686-2526
Location 114 Technology Dr Ste 120East Setauket, NY 11733-4068 · Phone (631) 686-2526
Location 125225 Nesconset Hwy Bldg 1314Port Jefferson Station, NY 11776-2053 · Phone (631) 686-2526
Location 139 Medical DrPort Jefferson Station, NY 11776-1591 · Phone (631) 686-2526

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)

Harbor View Medical Services Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

51

Medicare enrollment records show 51 clinicians reassign Medicare billing to Harbor View Medical Services PC, which bills Medicare for the services they deliver. Of these, 5 practice at this address and 35 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 15

Nurse Practitioner12
Internal Medicine8
Cardiovascular Disease (Cardiology)6
Family Practice5
Endocrinology4
Vascular Surgery3
Critical Care (Intensivists)2
Gastroenterology2
7 other specialties9

Nearest to this location (20)

See all 51
Samantha Baca
Nurse Practitioner
NPI 1851120463
125 OAKLAND AVE STE 203
Port Jefferson, NY 11777
(631) 978-7590
✔ PECOS✔ Accepts MedicareSame address
Georgia Kulina, M.D.
Endocrinology
NPI 1457650210
125 OAKLAND AVE STE 203
Port Jefferson, NY 11777
(631) 978-7590
✔ PECOS✔ Accepts MedicareSame address
Priscilla Persaud, M.D.
Internal Medicine
NPI 1457640088
125 OAKLAND AVE STE 204
Port Jefferson, NY 11777
(631) 686-1400
✔ PECOS✔ Accepts MedicareSame address
Connor Abramowicz, DO
Endocrinology
NPI 1508485913
125 OAKLAND AVE
Port Jefferson, NY 11777
(631) 978-7590
✔ PECOS✔ Accepts MedicareSame address
Jessica Blydenburgh, D.O.
Family Practice
NPI 1144548918
125 OAKLAND AVE
Port Jefferson, NY 11777
(631) 736-1311
✔ PECOS✔ Accepts MedicareSame address
Karina Fatakhova, M.D.
Gastroenterology
NPI 1811429343
70 N COUNTRY RD STE 101
Port Jefferson, NY 11777
(631) 978-7700
✔ PECOS✔ Accepts Medicare0.1 mi
Mohamad Abouzeid, M.D.
General Surgery
NPI 1144464421
70 N COUNTRY RD STE 102
Port Jefferson, NY 11777
(631) 938-6999
✔ PECOS✔ Accepts Medicare0.1 mi
Anna Burrowes-Mulvey, RDN, CDCES
Registered Dietitian or Nutrition Professional
NPI 1669239703
70 N COUNTRY RD STE 303
Port Jefferson, NY 11777
(631) 621-4093
✔ Accepts Medicare0.1 mi
Lisa Pereira, AGNP-C
Nurse Practitioner
NPI 1790447688
70 N COUNTRY RD STE 102
Port Jefferson, NY 11777
(631) 938-6999
✔ PECOS✔ Accepts Medicare0.1 mi
Katlyn Conville, NP
Nurse Practitioner
NPI 1023679503
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 686-2565
✔ PECOS✔ Accepts Medicare0.2 mi
Andrew Weber, MD
Critical Care (Intensivists)
NPI 1922492305
75 N COUNTRY RD
Port Jefferson, NY 11777
(516) 698-9289
✔ PECOS✔ Accepts Medicare0.2 mi
Halyna Chykyda
Internal Medicine
NPI 1881073740
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts Medicare0.2 mi
Daniel Shapiro, NP
Nurse Practitioner
NPI 1407324478
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS0.2 mi
Mohit Sharma, M.D.
Cardiovascular Disease (Cardiology)
NPI 1063831428
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts Medicare0.2 mi
Ella Rosenbloom, M.D.
Endocrinology
NPI 1811275548
625 BELLE TERRE RD
Port Jefferson, NY 11777
(631) 686-2551
✔ PECOS✔ Accepts Medicare0.2 mi
Ahmad Bhatti, MD
Vascular Surgery
NPI 1598783953
620 BELLE TERRE RD SUITE #2
Port Jefferson, NY 11777
(631) 524-5960
✔ PECOS✔ Accepts Medicare0.3 mi
Deborah Kacherski, N.P.
Nurse Practitioner
NPI 1134373335
815 HALLOCK AVE SUITE B
Port Jefferson Station, NY 11776
(631) 928-9355
✔ PECOS✔ Accepts Medicare0.6 mi
Christine Fruth Giacobbe, D.O.
Internal Medicine
NPI 1417920208
9 MEDICAL DR SUITE B
Port Jefferson Station, NY 11776
(631) 473-3900
✔ PECOS✔ Accepts Medicare0.7 mi
Varvara Boryushkina, MD
Internal Medicine
NPI 1164927661
1500 ROUTE 112 STE A
Port Jefferson Station, NY 11776
(631) 686-1414
✔ PECOS✔ Accepts Medicare2.0 mi
Zarlasht Khan
Rheumatology
NPI 1073939625
1500 ROUTE 112
Port Jefferson Station, NY 11776
(631) 743-6840
✔ PECOS✔ Accepts Medicare2.0 mi
See all 51 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 Harbor View Medical Services PC's NPI number?

The NPI number for Harbor View Medical Services PC is 1306631742. It was assigned to this organization in the NPPES registry on April 14, 2025. The provider is doing business as Mather Medical Group.

Where is Harbor View Medical Services PC located?

Harbor View Medical Services PC is located at 125 Oakland Ave Ste 204, Port Jefferson, NY 11777. The listed phone number is (631) 686-2526.

What is Harbor View Medical Services PC's specialty?

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

Is Harbor View Medical Services PC enrolled in Medicare?

Yes. Harbor View Medical Services PC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Harbor View Medical Services PC?

According to the CMS Revalidation Reassignment List (October 2026 release), 51 clinicians in 15 Medicare specialties reassign their Medicare billing to Harbor View Medical Services PC. 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 (12), Internal Medicine (8) and Cardiovascular Disease (Cardiology) (6). Of these, 5 practice at this address and 35 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 Harbor View Medical Services PC was last updated on April 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.