Caitlin O'callaghan Reen, NP - Medicare Nurse Practitioner in Boston, MA

Caitlin O'callaghan Reen, NP is a medicare enrolled "Nurse Practitioner - Adult Health" in Boston, Massachusetts. She graduated from nursing school in 2007 and has 17 years of diverse experience with area of expertise as Nurse Practitioner. She is a member of the group practice Massachusetts General Physicians Organization Inc and her current practice location is 55 Fruit St, Gray / Bigelow 800, Mailstop 843, Boston, Massachusetts. You can reach out to her office (for appointments etc.) via phone at (617) 724-0122.

Caitlin O'callaghan Reen is licensed to practice in Massachusetts (license number 256018) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1033391685.

Contact Information

Caitlin O'callaghan Reen, NP
55 Fruit St, Gray / Bigelow 800, Mailstop 843,
Boston, MA 02114-2621
(617) 724-0122
Not Available

Map and Direction




Provider's Profile

Full NameCaitlin O'callaghan Reen
GenderFemale
SpecialityNurse Practitioner
Experience17 Years
Location55 Fruit St, Boston, Massachusetts
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Caitlin O'callaghan Reen graduated from nursing school in 2007
  NPI Data:
  • NPI Number: 1033391685
  • Provider Enumeration Date: 12/05/2007
  • Last Update Date: 02/18/2016
  Medicare PECOS Information:
  • PECOS PAC ID: 1658458468
  • Enrollment ID: I20080403000282

Medical Identifiers

Medical identifiers for Caitlin O'callaghan Reen such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1033391685NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
363LA2200XNurse Practitioner - Adult Health 256018 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Massachusetts General HospitalBoston, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Massachusetts General Physicians Organization Inc24663658203084

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. Caitlin O'callaghan Reen allows following entities to bill medicare on her behalf.
Entity NameMassachusetts General Physicians Organization Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1801874573
PECOS PAC ID: 2466365820
Enrollment ID: O20031111000434
Entity NameThe General Hospital Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1023049236
PECOS PAC ID: 6507803806
Enrollment ID: O20080313000351
Entity NameSignify Health Medical Associates Pllc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1750845863
PECOS PAC ID: 2163764424
Enrollment ID: O20200204002341

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. Caitlin O'callaghan Reen 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
Caitlin O'callaghan Reen, NP
73 Chelsea St, Apartment 307,
Charlestown, MA 02129-2039

Ph: () -
Caitlin O'callaghan Reen, NP
55 Fruit St, Gray / Bigelow 800, Mailstop 843,
Boston, MA 02114-2621

Ph: (617) 724-0122

Reviews and Comments


Nurse Practitioner Nurses in Boston, MA

Kristen Cahill, APRN
Nurse Practitioner
Medicare: Accepting Medicare Assignments
Practice Location: 600 Washington St, Boston, MA 02111
Phone: 508-685-8452    
Mrs. Patricia Noreen Finneran, NP-C
Nurse Practitioner
Medicare: Medicare Enrolled
Practice Location: 15 Parkman St, Wac 440, Boston, MA 02114
Phone: 617-643-4709    
Miss Megan Elizabeth Smetana, RN, CPNP-AC
Nurse Practitioner
Medicare: Medicare Enrolled
Practice Location: 300 Longwood Ave, Cardiology, Boston, MA 02115
Phone: 617-355-8689    
Mr. Courtney Sullivan Fratto, CPNP
Nurse Practitioner
Medicare: Not Enrolled in Medicare
Practice Location: 300 Longwood Ave, Hunnewell Building 322, Boston, MA 02115
Phone: 857-218-4085    
Ms. Kelly Elisha Trecartin, NP
Nurse Practitioner
Medicare: Medicare Enrolled
Practice Location: 55 Fruit St, Bigalow 852 F, Boston, MA 02114
Phone: 617-726-7400    Fax: 617-726-4149
Mrs. Melissa Ashley Ziogas, APRN-FNP
Nurse Practitioner
Medicare: Accepting Medicare Assignments
Practice Location: 133 Brookline Ave, Boston, MA 02215
Phone: 617-421-1000    
Jamie Marie Allen, NP
Nurse Practitioner
Medicare: Medicare Enrolled
Practice Location: 55 Fruit St, Boston, MA 02114
Phone: 617-724-4410    

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.