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

CASSANDRA R DUFFY M.D. M.P.H.
NPI 1770840274
Obstetrics & Gynecology - Maternal & Fetal Medicine in Boston, MA

Active since April 20, 2012PECOS Enrolled
330 BROOKLINE AVE, BOSTON, MA 02215(617) 667-2636 Get Directions Write a Review

NPPES record last updated: November 19, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Nov 19, 2025, Oct 10, 2019, Aug 23, 2019 (3 updates tracked since 2019).

About Cassandra R Duffy M.d. M.p.h. NPPES

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

CASSANDRA R DUFFY M.D. M.P.H. (NPI 1770840274) is an individual maternal & fetal medicine provider in Boston, Massachusetts, licensed in Massachusetts (278272) and active in the NPI registry since April 2012. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1770840274
Entity TypeIndividualFemale
Primary Taxonomy207VM0101X
Provider Legal NameCASSANDRA R DUFFYCredential: M.D. M.P.H.
Location Address330 BROOKLINE AVEBoston, MA 02215-5400
Mailing Address8 Belmore Ter Apt 1Jamaica Plain, MA 02130-4900 · (314) 703-8759
Phone(617) 667-2636
Sole ProprietorYes
Enumeration DateApril 20, 2012
Last NPPES UpdateNovember 19, 20253 updates tracked since enumeration
NPPES CertifiedNovember 19, 2025
✔ NPI 1770840274 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & Gynecology · Maternal & Fetal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207VM0101X
License✔ Licensed in MA · 278272
Definition
An obstetrician/gynecologist who cares for, or provides consultation on, patients with complications of pregnancy. This specialist has advanced knowledge of the obstetrical, medical and surgical complications of pregnancy and their effect on both the mother and the fetus. The specialist also possesses expertise in the most current diagnostic and treatment modalities used in the care of patients with complicated pregnancies.
330 BROOKLINE AVE, Boston, MA 02215
Open in Google Maps ↗

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

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)

Cassandra R Duffy M.d. M.p.h. 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

3

Medicare enrollment records show Cassandra Duffy reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Beth Israel Deaconess Medical Center, Inc.
Same address
General Acute Care Hospital
330 BROOKLINE AVE, ST 207
Boston, MA 02215
  • Reassigned Medicare billing, Massachusetts enrollment
  • 1,477 clinicians in this Medicare group
NPI 1548202641 (617) 667-1961
Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc
Same address
Internal Medicine
330 BROOKLINE AVE
Boston, MA 02215
  • Reassigned Medicare billing, Massachusetts enrollment
  • Also billed through NPI 1518908136 (Massachusetts)
  • 2,579 clinicians in this Medicare group
NPI 1194765438 (617) 754-9600
Chmc Surgical Foundation Inc
0.2 mi
Pediatric Surgery
300 LONGWOOD AVE, FEGAN 3
Boston, MA 02115
  • Reassigned Medicare billing, Massachusetts enrollment
  • 109 clinicians in this Medicare group
NPI 1902977515 (617) 355-8326

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 02215 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
$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.

BETH ISRAEL DEACONESS MEDICAL CENTER
Chronic Disease Hospital (Children)
330 BROOKLINE AVE
BOSTON, MA 02215
Suffolk County (617) 677-4042
DR. BRIAN DANIEL HOBBS MD, MMSC
Internal Medicine
330 BROOKLINE AVE, PULMONARY AND CRITICAL CARE DEPARTMENT
BOSTON, MA 02215
Suffolk County (617) 667-5864
ERICA DOMMASCH MD
Dermatology
330 BROOKLINE AVE, SHAPIRO 2
BOSTON, MA 02215
Suffolk County (617) 667-3753
VAHID KIARAD M.D
Anesthesiology
330 BROOKLINE AVE
BOSTON, MA 02215
Suffolk County (617) 667-7000
DR. MICHAEL R GOLDSTEIN PHD
Psychologist (Clinical)
330 BROOKLINE AVE
BOSTON, MA 02215
Suffolk County (617) 356-7246
SARA MURDOCK CAHILL MD
Hospitalist
330 BROOKLINE AVE
BOSTON, MA 02215
Suffolk County (617) 667-7000
DR. DEVON ABT HARRIS MD
Obstetrics & Gynecology (Gynecologic Oncology)
330 BROOKLINE AVE, KIRSTEIN 3
BOSTON, MA 02215
Suffolk County (617) 667-3736
DR. ELIZABETH MAIER BALOUGH MD, PHD
Student in an Organized Health Care Education/Training Program
330 BROOKLINE AVE
BOSTON, MA 02215
Suffolk County (617) 667-7000

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 Cassandra Duffy's NPI number?

The NPI number for Cassandra Duffy is 1770840274. It was assigned to this individual provider in the NPPES registry on April 20, 2012.

Where is Cassandra Duffy located?

Cassandra Duffy practices at 330 Brookline Ave, Boston, MA 02215. The listed phone number is (617) 667-2636.

What is Cassandra Duffy's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Maternal & Fetal Medicine, with taxonomy code 207VM0101X.

Is Cassandra Duffy enrolled in Medicare?

Yes. Cassandra Duffy is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Cassandra Duffy's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Cassandra Duffy reassigns Medicare benefits to 3 organizations: Beth Israel Deaconess Medical Center, Inc. (Boston, MA), Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc (Boston, MA) and Chmc Surgical Foundation 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 Cassandra Duffy's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Cassandra Duffy accept?

Health plans from Taro Health list Cassandra Duffy 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 Cassandra Duffy was last updated on November 19, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.