Margaret Essex Castor, WHNP
Women's Health Nurse Practitioner · Phoenix, AZ
Margaret Essex Castor, WHNP is a women's health nurse practitioner with a practice address in Phoenix, Arizona, and NPI 1275960585, issued on Oct 1, 2013. Check the license (Arizona 300500, as entered in NPPES) with the Arizona board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Margaret Essex Castor
- Credential
- WHNP
- Primary taxonomy
- Women's Health Nurse Practitioner 363LW0102X
- License number
- 300500 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 11209 N Tatum Blvd Ste 255, Phoenix, AZ 85028
- Phone
- (602) 494-5050
- Enumerated
- Oct 1, 2013
- Record last updated
- Feb 4, 2026
- Fax
- (866) 777-2251
- Medicare enrollment
- Enrolled (PECOS I20240501001723); accepts Medicare assignment
- Medical or professional school
- Vanderbilt University School Of Medicine, 2013
- Entity
- Type 1 · individual
Also registered at 11209 N Tatum Blvd Ste 255
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tawany Almeida, MDObstetrics & Gynecology Physician1821625484
- Esther Apraku Bondzie, WHNPWomen's Health Nurse Practitioner1295515245
- Olivia Blackstone, DOObstetrics & Gynecology Physician1144858077
- Allie Kosena, WHNP-BCWomen's Health Nurse Practitioner1063226751
- Susan Maland-Ludewig, WHNPObstetrics & Gynecology Nurse Practitioner1972794246
- Susan O'Brien, APNNurse Practitioner1225388176
Verify Margaret Essex Castor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Arizona board licenses this profession
Search for license 300500Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average women's health nurse practitioner in 2024
46 Medicare Part D claims for 24 beneficiaries, against an average of 217 among the 3,809 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $117.63
7 payments; by number, the most common kind was food and beverage; the largest payer was Aspira Women's Health Inc. The 3,574 providers of this specialty with any payment received $426.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Genesis OB Gyn PLLCPhoenix, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Women's Health Nurse Practitioner providers in Arizona
There are 261 women's health nurse practitioner records in Arizona.
Other women's health nurse practitioner records in Arizona
- Jan Abington, NPTucson, AZ1417067646
- Lorraine Aguilar, RNP WHCSacaton, AZ1154406874
- Victory Akem, WHNPChandler, AZ1033695531
- Traci Aldridge, WHNP/FNPGlendale, AZ1750468138
- Barbara Allen, RNTucson, AZ1386621738
- Sarah Alley, APNPhoenix, AZ1144624404
- Adrienne AndersonSierra Vista, AZ1598695660
- Kimberly Anderson, N.P.Gilbert, AZ1871850214
- Beth Andresen, WHNPTucson, AZ1992865737
- Luciana Anthony, WHNPMesa, AZ1699728147
Common questions
What is Margaret Essex Castor, WHNP's NPI number?
Margaret Essex Castor, WHNP's National Provider Identifier (NPI) is 1275960585, issued on Oct 1, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Essex Castor, WHNP located?
The NPPES record lists a practice address at 11209 N Tatum Blvd Ste 255, Phoenix, AZ, 85028. Phone: (602) 494-5050. Providers update this record themselves, so call before visiting.
How can I verify Margaret Essex Castor, WHNP's license?
NPPES lists Arizona license number 300500, as entered by the provider. Search the Arizona board that licenses this profession; the NPPES record confirms identity only.
How much does Margaret Essex Castor, WHNP prescribe under Medicare Part D?
In 2024, Margaret Essex Castor, WHNP had 46 Medicare Part D claims for 24 beneficiaries; the average among women's health nurse practitioner prescribers was 217. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.