MEGAN J BRENNAN CRNA
NPI 1508329525
Nurse Anesthetist, Certified Registered in Saint Louis, MO
About Megan J Brennan Crna NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MEGAN J BRENNAN CRNA (NPI 1508329525) is an individual nurse anesthetist, certified registered in Saint Louis, Missouri, licensed in Missouri (2019012309) and active in the NPI registry since April 2019. She is affiliated with Missouri Baptist Medical Center, maintains 2 additional practice locations, and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Locations 2
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
Megan J Brennan Crna 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 Reassignments
4Medicare enrollment records show Megan Brennan reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saint Louis, MO 63131
- Reassigned Medicare billing, Missouri enrollment
- 102 clinicians in this Medicare group
Chesterfield, MO 63017
- Reassigned Medicare billing, Missouri enrollment
- 221 clinicians in this Medicare group
Saint Peters, MO 63376
- Reassigned Medicare billing, Missouri enrollment
- 26 clinicians in this Medicare group
Scottsdale, AZ 85259
- Reassigned Medicare billing, Arizona enrollment
- 1,792 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 2
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.
Missouri Baptist Medical Center
Acute Care Hospitals · Town And Country, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63131 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 63131
SAINT LOUIS, MO 63131
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 Megan Brennan's NPI number?
The NPI number for Megan Brennan is 1508329525. It was assigned to this individual provider in the NPPES registry on April 8, 2019. The provider is also known as Megan Thielemier.
Where is Megan Brennan located?
Megan Brennan practices at 3015 N Ballas Rd, Saint Louis, MO 63131. The listed phone number is (314) 996-5000.
What is Megan Brennan's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Megan Brennan enrolled in Medicare?
Yes. Megan Brennan 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 organizations bill Medicare for Megan Brennan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Megan Brennan reassigns Medicare benefits to 4 organizations: Missouri Baptist Medical Center (Saint Louis, MO), Metro-West Anesthesia Group Inc (Chesterfield, MO), Ambulatory Anesthesia Services Of St. Charles, LLC (Saint Peters, MO) and Mayo Clinic Arizona (Scottsdale, AZ). Each 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 Megan Brennan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Megan Brennan accept?
Health plans from CareSource list Megan Brennan 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 Megan Brennan affiliated with any hospitals?
According to CMS data, Megan Brennan is affiliated with Missouri Baptist Medical Center.
When was this NPI record last updated?
The NPPES record for Megan Brennan was last updated on August 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Megan J Brennan, CRNA · NPI 1508329525
Nurse Anesthetist, Certified Registered physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since April 8, 2019.
## Identity
- **NPI:** 1508329525 (Entity type: Individual)
- **Enumerated:** April 8, 2019
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** 2019012309 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 3015 N BALLAS RD, Saint Louis, MO 63131-2329
- **Phone:** (314) 996-5000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Missouri Baptist Medical Center (NPI 1609658905, Saint Louis, MO); Metro-West Anesthesia Group Inc (NPI 1245427335, Chesterfield, MO); Ambulatory Anesthesia Services Of St. Charles, LLC (NPI 1467634097, Saint Peters, MO); Mayo Clinic Arizona (NPI 1558332494, Scottsdale, AZ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** August 11, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1508329525) · Data from the CMS NPPES public registry.