1. Home
  2. Directory
  3. Massachusetts
  4. Boston
  5. Surgery
  6. NPI Profile

DR. PETER THEODORE MASIAKOS MD
NPI 1598749285
Surgery in Boston, MA

Active since December 06, 2005PECOS Enrolled
55 FRUIT ST, WRN 11 PEDIATRIC SURGERY, BOSTON, MA 02114(617) 726-8839(617) 726-2167 Get Directions Write a Review

NPPES record last updated: November 30, 2012. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Peter Theodore Masiakos Md NPPES

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

DR. PETER THEODORE MASIAKOS MD (NPI 1598749285) is an individual surgery provider in Boston, Massachusetts, licensed in Massachusetts (216940) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1598749285
Entity TypeIndividualMale
Primary Taxonomy208600000X
Provider Legal NameDR. PETER THEODORE MASIAKOSCredential: MD
Location Address55 FRUIT ST, WRN 11 PEDIATRIC SURGERYBoston, MA 02114-2696
Mailing AddressPo Box 9142, Mass General Physician OrganizationCharlestown, MA 02129-9142 · (617) 726-8839 · Fax (617) 726-2167
Phone(617) 726-8839
Fax(617) 726-2167
Sole ProprietorNo
Enumeration DateDecember 6, 2005
Last NPPES UpdateNovember 30, 2012
✔ NPI 1598749285 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySurgeryAllopathic & Osteopathic Physicians
Taxonomy Code208600000X
License✔ Licensed in MA · 216940
Definition
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
55 FRUIT ST, Boston, MA 02114
Open in Google Maps ↗

Other Identifiers 5

OtherJ27581MA · Bcbs Ma
Medicare UPINI14066
Medicare ID-Type UnspecifiedA37463MA
Medicaid2065673MA
Other469284MA · Tufts Health Plan

Accepted Insurance

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

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Peter Theodore Masiakos Md 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 Reassignments

2

Medicare enrollment records show Peter Masiakos reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Massachusetts General Physicians Organization Inc
Same address
Dermatology
55 FRUIT ST, BUL 2
Boston, MA 02114
  • Reassigned Medicare billing, Massachusetts enrollment
  • 6,360 clinicians in this Medicare group
NPI 1801874573 (617) 724-0287
The General Hospital Corporation
Same address
General Acute Care Hospital
55 FRUIT ST, BULFINCH 360
Boston, MA 02114
  • Reassigned Medicare billing, Massachusetts enrollment
  • 6,234 clinicians in this Medicare group
NPI 1023049236 (617) 726-2000

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 02114 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
$78.84 typical visit price
range $21.07 – $155.29
Typical copayment $19.71 (range $5.26 – $38.82)
Most-billed visit code 99213
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.

STUTI GIRISH SHROFF MD, MBBS
Pathology (Anatomic Pathology)
55 FRUIT ST
BOSTON, MA 02114
Suffolk County (617) 726-2971
NANCY WANG M.D.
Internal Medicine (Hematology & Oncology)
55 FRUIT ST
BOSTON, MA 02114
Suffolk County (017) 724-4000
DR. DUSAN HANIDZIAR M.D., PH.D.
Anesthesiology
55 FRUIT ST, GRAY-BIGELOW 444
BOSTON, MA 02114
Suffolk County (617) 726-3030
JOHN JOSEPH DANKO DO
Physical Medicine & Rehabilitation
55 FRUIT ST
BOSTON, MA 02114
Suffolk County (617) 726-2000
DR. MICHAEL ANDREW LOBRITZ M.D, PH.D.
Internal Medicine (Infectious Disease)
55 FRUIT ST, DIVISION OF INFECTIOUS DISEASE, GRJ-504
BOSTON, MA 02114
Suffolk County (617) 724-9248
MS. KELLY ELISHA TRECARTIN NP
Nurse Practitioner (Acute Care)
55 FRUIT ST, BIGALOW 852 F
BOSTON, MA 02114
Suffolk County (617) 726-7400
JAMIE MARIE ALLEN NP
Nurse Practitioner
55 FRUIT ST
BOSTON, MA 02114
Suffolk County (617) 724-4410
DR. DHAVAL SANJEEV KOLTE M.B.B.S., PH.D.
Internal Medicine (Cardiovascular Disease)
55 FRUIT ST
BOSTON, MA 02114
Suffolk County (617) 643-3238

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 Peter Masiakos's NPI number?

The NPI number for Peter Masiakos is 1598749285. It was assigned to this individual provider in the NPPES registry on December 6, 2005.

Where is Peter Masiakos located?

Peter Masiakos practices at 55 Fruit St Wrn 11 Pediatric Surgery, Boston, MA 02114. The listed phone number is (617) 726-8839.

What is Peter Masiakos's specialty?

The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.

Is Peter Masiakos enrolled in Medicare?

Yes. Peter Masiakos is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Peter Masiakos's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Peter Masiakos reassigns Medicare benefits to 2 organizations: Massachusetts General Physicians Organization Inc (Boston, MA) and The General Hospital Corporation (Boston, MA). Each 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 Peter Masiakos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Peter Masiakos accept?

Health plans from Taro Health list Peter Masiakos 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 Peter Masiakos was last updated on November 30, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.