1. Home
  2. Directory
  3. Massachusetts
  4. Lowell
  5. Family Medicine
  6. NPI Profile

DR. MARGARITA C CASTRO-ZARRAGA M.D.
NPI 1578705679
Family Medicine in Lowell, MA

Active since April 03, 2009PECOS EnrolledAccepts Medicare Assignment
161 JACKSON ST, LOWELL, MA 01852(978) 937-9700(978) 221-6728 Get Directions Write a Review

NPPES record last updated: January 3, 2024. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jan 3, 2024, Oct 2, 2023, Jun 27, 2016 (3 updates tracked since 2016).

About Dr. Margarita C Castro-zarraga M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARGARITA C CASTRO-ZARRAGA M.D. (NPI 1578705679) is an individual family medicine provider in Lowell, Massachusetts, licensed in Massachusetts (251722) and active in the NPI registry since April 2009. She is enrolled in Medicare PECOS, is affiliated with Lowell General Hospital, and maintains a secondary practice location in Fitchburg.

NPPES Registry Identity

NPI1578705679
Entity TypeIndividualFemale
Primary Taxonomy207Q00000X
Provider Legal NameDR. MARGARITA C CASTRO-ZARRAGACredential: M.D.
Location Address161 JACKSON STLowell, MA 01852-2103
Mailing Address46 Sunset RdNeedham, MA 02494-1452 · (773) 322-9949
Phone(978) 937-9700
Fax(978) 221-6728
Sole ProprietorNo
Medical School CMSOtherGraduated 2005
Enumeration DateApril 3, 2009
Last NPPES UpdateJanuary 3, 20243 updates tracked since enumeration
NPPES CertifiedJanuary 3, 2024
✔ NPI 1578705679 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in MA · 251722
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
161 JACKSON ST, Lowell, MA 01852
Open in Google Maps ↗

Other Names 1

Former Name (1)Dr. Margarita Castro Castro M.d.

Secondary Practice Location 1

Location 1275 Nichols RdFitchburg, MA 01420-1919 · Phone (978) 878-8300 · Fax (978) 665-5922

Other Identifiers 1

Medicaid110028187AMA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Margarita C Castro-zarraga M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5991948259
PECOS Enrollment IDI20250312001989
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Hemoglobin a1c level 83036
Hemoglobin A1c (HbA1c) is a test that measures your average blood sugar level over the past 2-3 months. It's used to monitor how well diabetes is being controlled. High levels may indicate that your diabetes treatment plan needs adjustment.
32 services25 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Lowell General Hospital

Acute Care Hospitals · Lowell, MA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number220063
Location295 Varnum AvenueLowell, MA 01854 · Middlesex County
Emergency services Birthing friendly

United Regional Health Care System

Acute Care Hospitals · Wichita Falls, TX
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number450010
Location1600 11th StreetWichita Falls, TX 76301 · Wichita County
Emergency services Birthing friendly

Northwest Texas Hospital

Acute Care Hospitals · Amarillo, TX
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number450209
Location1501 S Coulter StAmarillo, TX 79106 · Potter County
Emergency services Birthing friendly

Clay County Memorial Hospital

Critical Access Hospitals · Henrietta, TX
OwnershipGovernment - Local
CMS Certification Number451362
Location310 W South StreetHenrietta, TX 76365 · Clay County
Emergency services

Comanche County Medical Center

Critical Access Hospitals · Comanche, TX
OwnershipVoluntary non-profit - Private
CMS Certification Number451382
Location10201 Hwy 16Comanche, TX 76442 · Comanche County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01852 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$97.64 typical visit price
range $63.72 – $189.86
Typical copayment $24.41 (range $15.93 – $47.46)
Most-billed visit code 99203
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. BRIAN JOHN PIETRANTONIO O.D.
Optometrist
161 JACKSON ST
LOWELL, MA 01852
Middlesex County (978) 937-9700
MR. DANIEL ALLEN SULLIVAN JR. M.ED.
Counselor (Addiction (Substance Use Disorder))
161 JACKSON ST
LOWELL, MA 01852
Middlesex County (978) 937-9700
EMILY DEPAOLI
Counselor (Mental Health)
161 JACKSON ST
LOWELL, MA 01852
Middlesex County (987) 937-9700
FLORA F SADRI-AZARBAYEJANI DO
Preventive Medicine (Addiction Medicine)
161 JACKSON ST
LOWELL, MA 01852
Middlesex County (978) 937-9700
MICHELLE MARTINEZ CNM, WHNP
Advanced Practice Midwife
161 JACKSON ST
LOWELL, MA 01852
Middlesex County (978) 937-9700
CAROLINE KERN PRIVITT CNM
Advanced Practice Midwife
161 JACKSON ST
LOWELL, MA 01852
Middlesex County (978) 937-9700
NISHA NAIK
Registered Nurse (Community Health)
161 JACKSON ST
LOWELL, MA 01852
Middlesex County (978) 937-9700
JOANNE THERESA HALVORSEN
Counselor (Addiction (Substance Use Disorder))
161 JACKSON ST
LOWELL, MA 01852
Middlesex County (978) 937-9700

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Margarita Castro-zarraga's NPI number?

The NPI number for Margarita Castro-zarraga is 1578705679. It was assigned to this individual provider in the NPPES registry on April 3, 2009. The provider is also known as Dr. Margarita Castro Castro M.D..

Where is Margarita Castro-zarraga located?

Margarita Castro-zarraga practices at 161 Jackson St, Lowell, MA 01852. The listed phone number is (978) 937-9700.

What is Margarita Castro-zarraga's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Margarita Castro-zarraga enrolled in Medicare?

Yes. Margarita Castro-zarraga is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Margarita Castro-zarraga accept?

Health plans from Blue Cross and Blue Shield of Texas list Margarita Castro-zarraga as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Margarita Castro-zarraga affiliated with any hospitals?

According to CMS data, Margarita Castro-zarraga is affiliated with Lowell General Hospital, United Regional Health Care System, Northwest Texas Hospital, Clay County Memorial Hospital and Comanche County Medical Center.

When was this NPI record last updated?

The NPPES record for Margarita Castro-zarraga was last updated on January 3, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.