DR. KATHARINE KENNEDY TREADWAY MD
NPI 1417944141
Internal Medicine in Boston, MA

Q: What is Katharine Treadway's NPI number?

The NPI number for Katharine Treadway is 1417944141. It was assigned to this individual provider in the NPPES registry on September 27, 2005.

Q: What is Katharine Treadway's specialty?

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

Active since September 27, 2005PECOS Enrolled

15 PARKMAN ST, WAC 615 INTERNAL MEDICINE ASSOCIATES TEAM 2, BOSTON, MA 02114(617) 726-2674(617) 724-0656 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Dr. Katharine Kennedy Treadway Md NPPES

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

DR. KATHARINE KENNEDY TREADWAY MD (NPI 1417944141) is an individual internal medicine provider in Boston, Massachusetts, licensed in Massachusetts (47706) and active in the NPI registry since September 2005. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1417944141

Entity TypeIndividualFemale

Primary Taxonomy207R00000X

Provider Legal NameDR. KATHARINE KENNEDY TREADWAYCredential: MD

Location Address15 PARKMAN ST, WAC 615 INTERNAL MEDICINE ASSOCIATES TEAM 2Boston, MA 02114-3117

Mailing AddressPo Box 9142, Mass General Physician OrganizationCharlestown, MA 02129-9142 · (617) 724-0287 · Fax (617) 726-2894

Phone(617) 726-2674

Fax(617) 724-0656

Sole ProprietorNo

Enumeration DateSeptember 27, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1417944141 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in MA · 47706

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.

15 PARKMAN ST, Boston, MA 02114

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Other Identifiers 3

Other044706MA · Tufts Health Plan

OtherE05495MA · Bcbs Ma

Medicaid0138053MA

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Katharine Kennedy Treadway 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

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

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

Massachusetts General Physicians Organization Inc

0.1 mi

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

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

$144.11 typical visit price

range $63.72 – $189.86

Typical copayment $36.02 (range $15.93 – $47.46)

Most-billed visit code 99204

Established Patient

$111.18 typical visit price

range $21.07 – $155.29

Typical copayment $27.79 (range $5.26 – $38.82)

Most-billed visit code 99214

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.

MRS. PATRICIA NOREEN FINNERAN NP-C

Nurse Practitioner (Adult Health)

15 PARKMAN ST, WAC 440
BOSTON, MA 02114

Suffolk County (617) 643-4709

MISS BRYANA CAREY PT, DPT

Physical Therapist

15 PARKMAN ST
BOSTON, MA 02114

Suffolk County (617) 643-4373

DR. WILLIAM ELLIS FALK MD

Psychiatry & Neurology (Geriatric Psychiatry)

15 PARKMAN ST, PSYCHIATRY OUTPATIENT DEPARTMENT WAC 812
BOSTON, MA 02114

Suffolk County (617) 726-5600

MRS. LILIAN DAYAN-CIMADORO PT,DPT,MS,NCS,CLT-LA

Physical Therapist (Neurology)

15 PARKMAN ST, ROOM 134
BOSTON, MA 02114

Suffolk County (617) 724-7484

MS. ANGELA MARY HAUBER DPT

Physical Therapist

15 PARKMAN ST
BOSTON, MA 02114

Suffolk County (617) 726-2962

JACKIE A MULGREW PT

Physical Therapist

15 PARKMAN ST, WACC 134
BOSTON, MA 02114

Suffolk County (617) 726-7487

MS. MARY S KNAB P.T.

Physical Therapist

15 PARKMAN ST
BOSTON, MA 02114

Suffolk County (617) 724-6398

DR. JAMES ELTON GROVES MD

Psychiatry & Neurology (Psychiatry)

15 PARKMAN ST, WAC 8 PSYCHIATRY OUTPATIENT DEPARTMENT
BOSTON, MA 02114

Suffolk County (617) 726-2714

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 Katharine Treadway's NPI number?

The NPI number for Katharine Treadway is 1417944141. It was assigned to this individual provider in the NPPES registry on September 27, 2005.

Where is Katharine Treadway located?

Katharine Treadway practices at 15 Parkman St Wac 615 Internal Medicine Associates Team 2, Boston, MA 02114. The listed phone number is (617) 726-2674.

What is Katharine Treadway's specialty?

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

Is Katharine Treadway enrolled in Medicare?

Yes. Katharine Treadway is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Katharine Treadway's services?

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

When was this NPI record last updated?

The NPPES record for Katharine Treadway was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.