Dr Margarita C Castro-zarraga, MD - Medicare Family Medicine in Lowell, MA

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Dr Margarita C Castro-zarraga, MD is a medicare enrolled "Family Medicine" physician in Lowell, Massachusetts. Her current practice location is 161 Jackson St, Lowell, Massachusetts. You can reach out to her office (for appointments etc.) via phone at (978) 937-9700.

Dr Margarita C Castro-zarraga is licensed to practice in Massachusetts (license number 251722) and she also participates in the medicare program. She does not accept medicare assignments directly but she may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. Her NPI Number is 1578705679.

Contact Information

Dr Margarita C Castro-zarraga, MD
161 Jackson St,
Lowell, MA 01852-2103
(978) 937-9700
(978) 221-6728

Map and Direction




Physician's Profile

Full NameDr Margarita C Castro-zarraga
GenderFemale
SpecialityFamily Medicine
Location161 Jackson St, Lowell, Massachusetts
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1578705679
  • Provider Enumeration Date: 04/03/2009
  • Last Update Date: 01/03/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 5991948259
  • Enrollment ID: I20130905000642

Medical Identifiers

Medical identifiers for Dr Margarita C Castro-zarraga such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1578705679NPI-NPPES
110028187AMedicaidMA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207Q00000XFamily Medicine 251722 (Massachusetts)Primary

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. Dr Margarita C Castro-zarraga allows following entities to bill medicare on her behalf.
Entity NameErickson Health Medical Group Of Massachusetts Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1164442919
PECOS PAC ID: 4183528300
Enrollment ID: O20031120000423
Entity NameCommunity Health Connections, Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1477580827
PECOS PAC ID: 8729074992
Enrollment ID: O20040422001136
Entity NameLowell Community Health Center Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1952307530
PECOS PAC ID: 6204807944
Enrollment ID: O20040804001749
Entity NameIpc Hospitalists Of New England Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1659555266
PECOS PAC ID: 7618051442
Enrollment ID: O20080303000565
Entity NameVantage Healthcare Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1366903551
PECOS PAC ID: 8224361191
Enrollment ID: O20190607000976

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. Dr Margarita C Castro-zarraga 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
Dr Margarita C Castro-zarraga, MD
46 Sunset Rd,
Needham, MA 02494-1452

Ph: (773) 322-9949		Dr Margarita C Castro-zarraga, MD
161 Jackson St,
Lowell, MA 01852-2103

Ph: (978) 937-9700

Reviews and Comments


Family Medicine Doctors in Lowell, MA

Melissa Lemayian,
Family Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 26 Ames St, Lowell, MA 01852
Phone: 978-746-1230    
Mr. Austin John O'brien, MD
Family Medicine
Medicare: Medicare Enrolled
Practice Location: 595 Pawtucket Blvd. 2nd Fl, 2nd Floor, Lowell, MA 01852
Phone: 978-459-8447    Fax: 978-459-6125
Dr. John N Grieveson, MD
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 33 Bartlett St Ste 204, Lowell, MA 01852
Phone: 978-453-0550    Fax: 888-481-1424
Mr. Syed Mohsin Mohsin Mazhar, MD
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 161 Jackson St, Lowell, MA 01852
Phone: 978-937-9700    
Dr. Zinabu Maxwell, MD
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 135 Jackson St, Lowell, MA 01852
Phone: 978-441-1700    Fax: 978-454-1681
Namita Tiwari, MD
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 295 Varnum Ave, Lowell, MA 01854
Phone: 978-258-4734    
Jessica Fournier, MD
Family Medicine
Medicare: Medicare Enrolled
Practice Location: 161 Jackson St, Lowell, MA 01852
Phone: 978-937-9700    Fax: 978-221-6728

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.