Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mary Margaret Kane-Brock, MD

Individual provider Specialist · NPI 1245312305

Mary Margaret Kane-Brock, MD practises Endocrinology in Greenwich, Connecticut. Qualified in 1987, 39 years ago. Practices with Northeast Medical Group Inc, a 1,360-clinician group and accepts Medicare assignment. Licensed in Connecticut.

Years since qualifying
39
Licensed in
CT
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

75 Holly Hill Ln
Greenwich, CT 06830-6098 Not confirmed with CMS for 12 years — call before visiting
Phone: (203) 869-6960
Fax: (203) 869-5103
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 035005 (CT)
Specialist Taxonomy 174400000X · Licence 035005 (CT)

Record details

NPI number1245312305
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 19, 2006
Last updated in NPPESSeptember 3, 2014

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyENDOCRINOLOGY
Medical schoolOTHER
Graduated 1987 (39 years in practice)
Group practice Northeast Medical Group Inc — 1360 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients197
Services billed 541 a service is one billed item, such as a visit, a test or a procedure
Average patient age83

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Northeast Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1360 clinicians in the practice; 12 are shown here.

Other providers in Greenwich