Mary G Diana, MD - Medicare Obstetrics/gynecology in Greenwich, CT

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Mary G Diana, MD is a medicare enrolled "Obstetrics & Gynecology" physician in Greenwich, Connecticut. She went to Columbia University College Of Physicians And Surgeons and graduated in 1992 and has 34 years of diverse experience with area of expertise as Obstetrics/gynecology. She is a member of the group practice Montefiore Medical Center, Yale University and her current practice location is 5 Perryridge Rd, Greenwich, Connecticut. You can reach out to her office (for appointments etc.) via phone at (203) 863-3000.

Mary G Diana is licensed to practice in New York (license number 200058) and she also participates in the medicare program. She may accept medicare assignments (which means she may accept the Medicare-approved amount; you may be billed for more than the Medicare deductible and coinsurance) and her NPI Number is 1962445684.

Contact Information

Mary G Diana, MD
5 Perryridge Rd,
Greenwich, CT 06830-4697
(203) 863-3000
Not Available

Map and Direction




Physician's Profile

Full NameMary G Diana
GenderFemale
SpecialityObstetrics/gynecology
Experience34 Years
Location5 Perryridge Rd, Greenwich, Connecticut
Accepts Medicare AssignmentsMay be. She may accept the Medicare-approved amount; you may be billed for more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Mary G Diana attended and graduated from Columbia University College Of Physicians And Surgeons in 1992
  NPI Data:
  • NPI Number: 1962445684
  • Provider Enumeration Date: 06/13/2006
  • Last Update Date: 09/25/2026
  Medicare PECOS Information:
  • PECOS PAC ID: 5698798650
  • Enrollment ID: I20060105000531

Medical Identifiers

Medical identifiers for Mary G Diana such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1962445684NPI-NPPES
01659383MedicaidNY
0667910001OtherNYDME
P00413156OtherNYMEDICARE RAILROAD

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207V00000XObstetrics & Gynecology 56749 (Connecticut)Secondary
207V00000XObstetrics & Gynecology 200058 (New York)Primary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Montefiore Medical Center37794960212809
Yale University94360617362632

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Mary G Diana allows following entities to bill medicare on her behalf.
Entity NameMontefiore Medical Center
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1063525152
PECOS PAC ID: 3779496021
Enrollment ID: O20031113000235
Entity NameCrystal Run Healthcare Physicians LLP
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1952376410
PECOS PAC ID: 6901792696
Enrollment ID: O20040227000791
Entity NameObgyn Hospitalist Medical Services of New York PC
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1518285055
PECOS PAC ID: 9830379759
Enrollment ID: O20110210000282

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Mary G Diana is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Mary G Diana, MD
31 Chichester Rd,
New Canaan, CT 06840-3912

Ph: (845) 325-6127		Mary G Diana, MD
5 Perryridge Rd,
Greenwich, CT 06830-4697

Ph: (203) 863-3000

Reviews and Comments


Obstetrics & Gynecology Doctors in Greenwich, CT

Linda M Reid, MD
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 644 W Putnam Ave, Greenwich, CT 06830
Phone: 203-210-2880    Fax: 203-210-2881
Dr. Patricia Eillen Palos,
Obstetrics & Gynecology
Medicare: Medicare Enrolled
Practice Location: 2 1/2 Dearfield Dr, Suite 101, Greenwich, CT 06831
Phone: 203-861-9586    Fax: 203-861-9587
Dr. Ecaterina Monica Moisa-babii, M.D.
Obstetrics & Gynecology
Medicare: Accepting Medicare Assignments
Practice Location: 5 Perryridge Rd, Greenwich, CT 06830
Phone: 203-863-3000    
Dr. Karli Provost Goldstein, D.O.
Obstetrics & Gynecology
Medicare: Not Enrolled in Medicare
Practice Location: 779 North St, Greenwich, CT 06831
Phone: 646-844-9602    Fax: 646-846-2310
Jeff G Wang, MD
Obstetrics & Gynecology
Medicare: Not Enrolled in Medicare
Practice Location: 100 Putnam Grn, Greenwich, CT 06830
Phone: 203-774-9900    
Leigh D. Rosen, MD
Obstetrics & Gynecology
Medicare: Medicare Enrolled
Practice Location: 779 North St, Greenwich, CT 06831
Phone: 646-844-9602    Fax: 646-846-2310
Masahide D Kanayama, M.D.
Obstetrics & Gynecology
Medicare: Not Enrolled in Medicare
Practice Location: 4 Dearfield Dr, Greenwich, CT 06831
Phone: 203-422-0477    Fax: 203-661-1607

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.