Margaret Essex Castor, WHNP

Primary specialty

Women's Health Nurse PractitionerTaxonomy code 363LW0102X

License

300500 Issued in AZ

Practice address

11209 N Tatum Blvd Ste 255
Phoenix, AZ 85028-6061

Phone

(602) 494-5050

Fax

(866) 777-2251

NPI assigned

Oct 1, 2013

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in IN, AZ2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 2

Specialty

Nurse Practitioner

Education

Vanderbilt University School of Medicine, 2013

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Genesis OB GYN PLLCGroup PAC ID 4284724279, 109 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://api.platform.athenahealth.com/19050/brand/1/csg/1/fhir/r4
• FHIR API: https://api.platform.athenahealth.com/615/brand/1/csg/1/fhir/r4
• Direct secure messaging: margaret.castor.1@19050.direct.athenahealth.com

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

• Genesis OB GYN PLLC

  • Obstetrics & Gynecology Physician
  • Tucson, AZ
  • NPI 1992994214
  Medicare reassignment Care Compare group NPD
• Seven Hills OB-GYN Associates LLC

  • Obstetrics & Gynecology Physician
  • Carmel, IN
  • NPI 1396350187

  Women'S Health

  Medicare reassignment NPD
• Camelback Womens Health, PC

  • Obstetrics & Gynecology Physician
  • Phoenix, AZ
  • NPI 1447378518
  NPD
• Seven Hills OB-GYN Associates, LLC

  • Obstetrics & Gynecology Physician
  • Indianapolis, IN
  • NPI 1780312975

  Women'S Health

  NPD

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

{
    "created_epoch": "1380585600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1770163200000",
    "number": "1275960585",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 81064",
            "city": "PHOENIX",
            "state": "AZ",
            "postal_code": "850691064",
            "telephone_number": "602-494-5050",
            "fax_number": "866-777-2251"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "11209 N TATUM BLVD STE 255",
            "city": "PHOENIX",
            "state": "AZ",
            "postal_code": "850286061",
            "telephone_number": "602-494-5050",
            "fax_number": "866-777-2251"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "4530 N 32nd St Ste 100",
            "address_purpose": "LOCATION",
            "city": "Phoenix",
            "state": "AZ",
            "postal_code": "850183357",
            "country_code": "US",
            "telephone_number": "602-468-3912",
            "fax_number": "866-777-2251",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "CASTOR",
        "first_name": "MARGARET",
        "middle_name": "ESSEX",
        "name_prefix": "Mrs.",
        "credential": "WHNP",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2013-10-01",
        "last_updated": "2026-02-04",
        "certification_date": "2026-02-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "163W00000X",
            "taxonomy_group": "",
            "desc": "Registered Nurse",
            "state": "AZ",
            "license": "300500",
            "primary": false
        },
        {
            "code": "363LW0102X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Women's Health",
            "state": "AZ",
            "license": "300500",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Nicole Raquel Castillo
• Castle Biosciences, Inc
• Anikka Ducharme Castle, LPC
• Hajnalka Hanna Castle, CPNP-PC
• Michael Castleberry
• Donna M Castrenze-Steele, FNP-C
• Christine A Castrichini, DC
• Emillie Rose Castrichini
• Michael J Castrichini, D.C.
• Gabriel Castrillo

• Women's Health Nurse Practitioner in Phoenix, AZ
• Providers in Phoenix, AZ by specialty
• Women's Health Nurse Practitioner in Arizona

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 4, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.