Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Margarita C Castro-Zarraga, MD

Individual provider Family Medicine Physician · NPI 1578705679

Dr. Margarita C Castro-Zarraga, MD is a Family Practice in Lowell, Massachusetts. Qualified in 2005, 21 years ago. Practices with Concord Medical Group PLLC, a 193-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
21
Licensed in
MA
In the registry since
2009
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

161 Jackson St
Lowell, MA 01852-2103
Phone: (978) 937-9700
Fax: (978) 221-6728
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 275 Nichols Rd, Fitchburg, MA 01420-1919 — (978) 878-8300

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 251722 (MA)

Record details

NPI number1578705679
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 3, 2009
Last updated in NPPESJanuary 3, 2024
Certification dateJanuary 3, 2024

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolOTHER
Graduated 2005 (21 years in practice)
Group practice Concord Medical Group Pllc — 193 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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