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

Dr. Margaret M Mack, PHD, MA, APRNBC

Individual provider Adult Psychiatric/Mental Health Clinical Nurse Specialist · NPI 1962618686

Dr. Margaret M Mack, PHD, MA, APRNBC is registered under Certified Clinical Nurse Specialist (Cns) in Wilmington, Delaware. Qualified in 1981, 45 years ago. Practices with Delaware Psychiatry, LLC, a 3-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Delaware.

Years since qualifying
45
Licensed in
DE
In the registry since
2007
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.
MA — Master of Arts
A graduate arts degree.

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Practice location Address checks out

10 Guyenne Rd
Wilmington, DE 19807-1414
Phone: (302) 530-0358
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Adult Psychiatric/Mental Health Clinical Nurse Specialist (primary) Taxonomy 364SP0809X · Licence LE-0000123 (DE)

Record details

NPI number1962618686
Entity typeIndividual (Type 1)
GenderFemale
Credentials PHD , MA , APRNBC
Sole proprietorYes
NPI enumeratedMay 16, 2007
Last updated in NPPESJune 29, 2021
Certification dateJune 29, 2021

Medicare enrollment

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

Medicare specialtyCERTIFIED CLINICAL NURSE SPECIALIST (CNS)
Medical schoolOTHER
Graduated 1981 (45 years in practice)
Group practice Delaware Psychiatry, Llc — 3 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients25
Services billed 349 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $2,400 93 payments · a meal or drink at a meeting or visit, not a fee
Education $133 3 payments · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at Delaware Psychiatry, LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Wilmington