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

Mrs. Maggie Brennan O'Block, RN, APN

Individual provider Nurse Practitioner · NPI 1295287365

Mrs. Maggie Brennan O'Block, RN, APN is a Nurse Practitioner in Nashville, Tennessee. Graduated from Vanderbilt University School of Medicine in 2016, 10 years ago. Practices with Vanderbilt University Medical Center, a 3,466-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Tennessee.

Years since qualifying
10
Trained at
Vanderbilt University School of Medicine
Licensed in
TN
In the registry since
2016
Specialties on file
3
What do these letters mean?
RN — Registered Nurse
A licensed nurse who completed a nursing degree and passed the NCLEX-RN examination.
APN — Advanced Practice Nurse
The umbrella title some states use for nurse practitioners and other advanced practice nurses.

See every abbreviation used in this directory →

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Practice location Address checks out

3601 The Vanderbilt Clinic
Nashville, TN 37232-2247
Phone: (615) 936-2000
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Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1725 Medical Center Pkwy, Murfreesboro, TN 37129-2247 — (615) 225-1990

Specialties & licences

Gerontology Nurse Practitioner (primary) Taxonomy 363LG0600X · Licence 21525 (TN)
Nurse Practitioner Taxonomy 363L00000X · Licence APN0000021525 (TN)
Women's Health Nurse Practitioner Taxonomy 363LW0102X · Licence 21525 (TN)

Record details

NPI number1295287365
Entity typeIndividual (Type 1)
GenderFemale
Credentials RN , APN
Sole proprietorNo
NPI enumeratedOctober 25, 2016
Last updated in NPPESDecember 10, 2023
Certification dateDecember 10, 2023

Medicare enrollment

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

Medicare specialtyNURSE PRACTITIONER
Medical schoolVANDERBILT UNIVERSITY SCHOOL OF MEDICINE
Graduated 2016 (10 years in practice)
Group practice Vanderbilt University Medical Center — 3466 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 patients680
Services billed 1,198 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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 $149 1 payment · a meal or drink at a meeting or visit, 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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Vanderbilt University Medical Center Hospital · Nashville, TN
  • Vanderbilt Tullahoma-Harton Hospital Hospital · Tullahoma, TN
  • Vanderbilt Wilson County Hospital Hospital · Lebanon, TN

Colleagues at Vanderbilt University Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3466 clinicians in the practice; 12 are shown here.

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