Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mrs. Margaret Essex Castor, WHNP

Individual provider Registered Nurse · NPI 1275960585

Mrs. Margaret Essex Castor, WHNP is a Nurse Practitioner in Phoenix, Arizona. Graduated from Vanderbilt University School of Medicine in 2013, 13 years ago. Practices with Genesis OB GYN PLLC, a 108-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
13
Trained at
Vanderbilt University School of Medicine
Licensed in
AZ
In the registry since
2013
Specialties on file
2
What do these letters mean?
WHNP — Women's Health Nurse Practitioner
A nurse practitioner specialising in women's health.

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Practice location Address checks out

11209 N Tatum Blvd Ste 255
Phoenix, AZ 85028-6061
Phone: (602) 494-5050
Fax: (866) 777-2251
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 4530 N 32nd St Ste 100, Phoenix, AZ 85018-3357 — (602) 468-3912

Specialties & licences

Women's Health Nurse Practitioner (primary) Taxonomy 363LW0102X · Licence 300500 (AZ)
Registered Nurse Taxonomy 163W00000X · Licence 300500 (AZ)

Record details

NPI number1275960585
Entity typeIndividual (Type 1)
GenderFemale
Credentials WHNP
Sole proprietorNo
NPI enumeratedOctober 1, 2013
Last updated in NPPESFebruary 4, 2026
Certification dateFebruary 4, 2026

Medicare enrollment

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

Medicare specialtyNURSE PRACTITIONER
Medical schoolVANDERBILT UNIVERSITY SCHOOL OF MEDICINE
Graduated 2013 (13 years in practice)
Group practice Genesis Ob Gyn Pllc — 108 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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