What is Gretchen Gignac's specialty?

Gretchen Gignac (NPI 1821288960) is a Medicare-billing provider whose primary specialty is Hematology-Oncology in Boston, MA.

Where does Gretchen Gignac practice?

Gretchen Gignac practices in Boston, MA, based on the location reported in the CMS Medicare provider datasets for NPI 1821288960.

How much does Medicare pay Gretchen Gignac?

Gretchen Gignac (NPI 1821288960) received approximately $32K in total Medicare Part B payments, serving 134 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1821288960

Gretchen GignacMD

Hematology-OncologyBoston, MAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

207

Unique beneficiaries

—

Total services

360

Distinct HCPCS

Medicare payment

$30K

Peer benchmark

Total Medicare services vs. 360 Hematology-Oncology providers in MA — below median (cohort median 624).

PRESCRIBING · PART D · 2024

Total Rx claims

661

Beneficiaries

—

Total drug cost

$2.4M

Distinct drugs

Brand share

67.0%

Top prescribed drugs

Relugolix294 claims

Darolutamide94 claims

Prednisone60 claims

Abiraterone Acetate57 claims

Bicalutamide53 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

REFERRAL NETWORK

Where Gretchen Gignac's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 16 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
BOSTON MEDICAL CENTER CORPORATION	196	3,709
Gustavo Mercier Diagnostic Radiology · Boston, MA	30	90
Michael Klein Cardiology · Boston, MA	30	102
Anuradha Rebello Diagnostic Radiology · Boston, MA	20	50
Stephan Anderson Diagnostic Radiology · Boston, MA	20	61
Mark Katz Urology · Boston, MA	19	122
Boston Public Health Commission Ambulance Service Provider · Boston, MA	17	65
Nagaraj-Setty Holalkere Diagnostic Radiology · Boston, MA	16	54
Milos Janicek Diagnostic Radiology · Boston, MA	16	54
Jimmy Wang Diagnostic Radiology · Boston, MA	16	51
Christina Lebedis Diagnostic Radiology · Boston, MA	15	43
Eascare Llc Ambulance Service Provider · Weymouth, MA	14	54

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events