MS. BRENNA NICOLE ZACK ACNP
NPI 1699307231
Nurse Practitioner in Saint Louis, MO
About Ms. Brenna Nicole Zack Acnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. BRENNA NICOLE ZACK ACNP (NPI 1699307231) is an individual nurse practitioner in Saint Louis, Missouri, licensed in Missouri (2020005013) and active in the NPI registry since February 2020. She is enrolled in Medicare PECOS, is affiliated with Barnes Jewish Hospital, and is a graduate of Other (2019).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Ms. Brenna Nicole Zack Acnp is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Brenna Zack reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Saint Louis, MO 63110
- Reassigned Medicare billing, Missouri enrollment
- 1,133 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Barnes Jewish Hospital
Acute Care Hospitals · Saint Louis, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63110 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Brenna Zack's NPI number?
The NPI number for Brenna Zack is 1699307231. It was assigned to this individual provider in the NPPES registry on February 11, 2020.
Where is Brenna Zack located?
Brenna Zack practices at 1 Barnes Jewish Hospital Plz Div Im Hospitalist, Saint Louis, MO 63110. The listed phone number is (314) 362-1700.
What is Brenna Zack's specialty?
The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.
Is Brenna Zack enrolled in Medicare?
Yes. Brenna Zack is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Brenna Zack's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Brenna Zack reassigns Medicare benefits to Washington University (Saint Louis, MO). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Brenna Zack's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Brenna Zack accept?
Health plans from UnitedHealthcare list Brenna Zack as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Brenna Zack affiliated with any hospitals?
According to CMS data, Brenna Zack is affiliated with Barnes Jewish Hospital.
When was this NPI record last updated?
The NPPES record for Brenna Zack was last updated on April 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Ms. Brenna Nicole Zack, ACNP · NPI 1699307231
Nurse Practitioner physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since February 11, 2020.
## Identity
- **NPI:** 1699307231 (Entity type: Individual)
- **Enumerated:** February 11, 2020
- **Primary specialty:** Nurse Practitioner · taxonomy 363L00000X
- **State license:** 2020005013 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 BARNES JEWISH HOSPITAL PLZ, DIV IM HOSPITALIST, Saint Louis, MO 63110-1003
- **Phone:** (314) 362-1700 · **Fax:** (314) 362-9878
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Washington University (NPI 1992746903, Saint Louis, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2019
## Record status
- **NPPES last updated:** April 17, 2025
- **Other identifiers:** Medicaid 420081763 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1699307231) · Data from the CMS NPPES public registry.