Individual provider Active NPI

Margarita C Castro-Zarraga, M.D.

  • Family Medicine Physician
  • Lowell, MA
National Provider Identifier
1578705679
Registry record updated Jan 3, 2024
On this page

Key facts

NPPES NPI Registry
Primary specialty
Family Medicine PhysicianTaxonomy code 207Q00000X
License
251722 Issued in MA
Practice address
161 Jackson St
Lowell, MA 01852-2103
Phone
(978) 937-9700
Fax
(978) 221-6728
NPI assigned
Apr 3, 2009
Last updated
Jan 3, 2024By the provider in NPPES
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jan 3, 2024

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Family Medicine Physician 207Q00000X 251722 MA Primary

Addresses

Primary practice location

161 Jackson St
Lowell, MA 01852-2103

Mailing address

46 Sunset Rd
Needham, MA 02494-1452
Phone (773) 322-9949

Other practice location 1

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

Other identifiers 1

IdentifierTypeStateIssuer
110028187AMedicaidMA

Other names 1

  • Dr. Margarita Castro Castro Former name

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MA, TX2 enrollments
Eligible to order & refer
  • Part B services: Yes
  • Medical equipment: Yes
  • Home health: Yes
  • Power mobility devices: Yes
  • Hospice: Yes
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20130905000642 MA Practitioner - Family Practice 5991948259 Reassigns benefits to 4 organizations
I20250312001989 TX Practitioner - Family Practice 5991948259 Reassigns benefits to 6 organizations

Care Compare profile

Medicare Care Compare
Specialty
Family Practice
Education
Other, 2005
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Concord Medical Group PLLCGroup PAC ID 0446296818, 189 clinicians
Em Alliance Texas PLLCGroup PAC ID 4587192430, 88 clinicians
Hospitalist Medicine Physicians of Texas - Houston, PLLCGroup PAC ID 2860881125, 19 clinicians
Concord Medical Group of Texas PLLCGroup PAC ID 7810117223, 319 clinicians

Practice addresses (Care Compare)

10201 Hwy 16
Comanche, TX 76442-4462
Phone (254) 879-4900

1501 S Coulter St
NW TX Healthcare Sys
Amarillo, TX 79106-1770
Phone (561) 203-0611

2601 Dimmitt Rd
Plainview, TX 79072-1833
Phone (806) 296-5531

310 W S St
Henrietta, TX 76365-3346
Phone (940) 538-5621

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
251722MAMDRegistered Nurse

Practice roles

OrganizationSpecialtyStatusNew patients
Lowell Community Health Center, Inc. Current Accepting new patients
Concord Medical Group PLLC CurrentSince Aug 14, 2025 Accepting new patients
Community Health Connections, Inc. CurrentSince Jun 16, 2013 Accepting new patients
County of Clay Family Medicine CurrentSince Jul 1, 2025 Accepting new patients
Concord Medical Group of Texas PLLC CurrentSince Jan 3, 2025 Accepting new patients
Hospitalist Medicine Physicians of Texas - Houston, PLLC CurrentSince Feb 7, 2026 Accepting new patients
Ipc Hospitalists of New England, P.C. Family Medicine CurrentSince Feb 1, 2018 Accepting new patients
Lowell Community Health Center, Inc. CurrentSince Oct 1, 2023 Accepting new patients
Community Health Connections, Inc. CurrentSince Jun 16, 2013 Accepting new patients
Lowell Community Health Center, Inc. CurrentSince Oct 1, 2023 Accepting new patients
Vantage Healthcare LLC CurrentSince Apr 1, 2020 Accepting new patients
Community Health Connections, Inc. Current Accepting new patients
County of Clay CurrentSince Jul 1, 2025 Accepting new patients
Em Alliance Texas, PLLC CurrentSince Nov 30, 2025 Accepting new patients
Ipc Hospitalists of New England PC Family Medicine CurrentSince Feb 1, 2018 Accepting new patients
County of Clay Current Accepting new patients
Briarwood Operator, LLC Past Accepting new patients

Locations

277 Washington St
Abington, MA 02351
Phone (781) 871-0200

45 Dan Rd
Canton, MA 02021
Phone (781) 318-3609

275 Nichols Rd
Fitchburg, MA 01420
Phone (978) 343-5048

326 Nichols Rd
Fitchburg, MA 01420
Phone (978) 343-5270

175 Connors St
Gardner, MA 01440
Phone (978) 410-6100

101 Jackson St
Lowell, MA 01852
Phone (978) 459-8656

161 Jackson St
Lowell, MA 01852
Phone (978) 746-7867

10 Veterans Memorial Dr
Milford, MA 01757
Phone (508) 473-6414

67 Union St
Natick, MA 01760
Phone (508) 383-1104

204 Proctor Ave
Revere, MA 02151
Phone (781) 286-3100

111 Huntoon Memorial Hwy
Rochdale, MA 01542
Phone (508) 892-4858

37 Route 6A
Sandwich, MA 02563
Phone (508) 888-8222

1501 S Coulter St
Amarillo, TX 79106
Phone (800) 354-1150

8960 Hillside Rd
Amarillo, TX 79119
Phone (806) 351-6987

200 S Geneva St
Breckenridge, TX 76424
Phone (254) 559-2241

10201 Highway 16
Comanche, TX 76442
Phone (254) 879-4910

412 W South St
Henrietta, TX 76365
Phone (940) 235-3403

310 W South St
Henrietta, TX 76365
Phone (806) 647-2191

2601 Dimmitt Rd
Plainview, TX 79072
Phone (806) 296-4282

Interoperability endpoints

  • Direct secure messaging: margarita.castro-zarraga.1@7402.direct.athenahealth.com
  • FHIR API: https://api.platform.athenahealth.com/7402/brand/1/csg/1/fhir/r4

Organizations & group practices 18

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

View all 18

Hospital & facility affiliations 10

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1238716800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1704240000000",
    "number": "1578705679",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "46 SUNSET RD",
            "city": "NEEDHAM",
            "state": "MA",
            "postal_code": "024941452",
            "telephone_number": "773-322-9949"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "161 JACKSON ST",
            "city": "LOWELL",
            "state": "MA",
            "postal_code": "018522103",
            "telephone_number": "978-937-9700",
            "fax_number": "978-221-6728"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "275 Nichols Rd",
            "address_purpose": "LOCATION",
            "city": "Fitchburg",
            "state": "MA",
            "postal_code": "014201919",
            "country_code": "US",
            "telephone_number": "978-878-8300",
            "fax_number": "978-665-5922",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "CASTRO-ZARRAGA",
        "first_name": "MARGARITA",
        "middle_name": "C",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2009-04-03",
        "last_updated": "2024-01-03",
        "certification_date": "2024-01-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "MA",
            "license": "251722",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "110028187A",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "MARGARITA",
            "last_name": "CASTRO",
            "middle_name": "CASTRO",
            "prefix": "DR.",
            "credential": "M.D.",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

Other providers in Lowell, MA

Sources for this page

Verify at the official NPI Registry.