Mary Margaret Kane-Brock, MD
Internal Medicine Physician · Greenwich, CT
Mary Margaret Kane-Brock, MD is an internal medicine physician with a practice address in Greenwich, Connecticut, and NPI 1245312305, issued on Oct 19, 2006. Check the license (Connecticut 035005, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Mary Margaret Kane-Brock
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 035005 CT
Self-reported in NPPES; status is on the state search - Practice location
- 75 Holly Hill LN, Greenwich, CT 06830
- Phone
- (203) 869-6960
- Enumerated
- Oct 19, 2006
- Record last updated
- Sep 3, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (203) 869-5103
- Medicare enrollment
- Enrolled (PECOS I20060411000024); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 75 Holly Hill LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anthony Alleva, MDInternal Medicine Physician1518938778
- Steven BennettProfessional Counselor1174048748
- Nicholas Browning, M.D.Internal Medicine Physician1003095050
- Michael Carney, DPTPhysical Therapist1649031337
- Danielle CheryRegistered Nurse1730995325
- Seagda CoyleMarriage & Family Therapist1942041108
Verify Mary Margaret Kane-Brock in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 035005Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average internal medicine physician in 2024
242 Medicare Part D claims for 82 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate30 claims
- Metoprolol Succinate17 claims
- Losartan Potassium16 claims
- Duloxetine Hcl11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 70.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Northeast Medical Group IncGreenwich, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
54 internal medicine physician records list a practice address in Greenwich
They are 54 of the 1,184 NPPES records with a practice address in Greenwich, and 2,623 internal medicine physician records in Connecticut.
All 54 in Greenwich → All 2,623 in Connecticut → Every provider in Greenwich →
Other internal medicine physician records in Connecticut
- Hoda Abdel Salam, M.D.New Britain, CT1144509316
- Gada Abdelhafiz, MDNew London, CT1467649558
- Racha Abi Melhem, MDDerby, CT1902471352
- Gerard Abidor, D.O.Bridgeport, CT1518014539
- Lilyan AbrahamFarmington, CT1447693254
- Richard Abraham, M.D.Canton, CT1023044252
- Odaliz Abreu-Lanfranco, MDNew Haven, CT1538276134
- Kenneth Abriola, MDGlastonbury, CT1083693022
- Florentino Abueg, MDSouthbury, CT1649372558
- Nila Aburto, MDStamford, CT1396325718
Common questions
What is Mary Margaret Kane-Brock, MD's NPI number?
Mary Margaret Kane-Brock, MD's National Provider Identifier (NPI) is 1245312305, issued on Oct 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Margaret Kane-Brock, MD located?
The NPPES record lists a practice address at 75 Holly Hill LN, Greenwich, CT, 06830. Phone: (203) 869-6960. Providers update this record themselves, so call before visiting.
How can I verify Mary Margaret Kane-Brock, MD's license?
NPPES lists Connecticut license number 035005, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary Margaret Kane-Brock, MD prescribe under Medicare Part D?
In 2024, Mary Margaret Kane-Brock, MD had 242 Medicare Part D claims for 82 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mary Margaret Kane-Brock, MD's MIPS final score?
The 2023 MIPS final score is 70.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.