MS. CAITLIN WYNNE IRBY CAA
NPI 1255819801
Anesthesiologist Assistant in Houston, TX
About Ms. Caitlin Wynne Irby Caa NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. CAITLIN WYNNE IRBY CAA (NPI 1255819801) is an individual anesthesiologist assistant in Houston, Texas and active in the NPI registry since August 2018. She is affiliated with Mercy Hospital St Louis and is a graduate of Other (2018).
NPPES Registry Identity
Specialties & Licenses
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. Caitlin Wynne Irby Caa 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 Caitlin Irby reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 309 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.
Mercy Hospital St Louis
Acute Care Hospitals · Saint Louis, MOOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
HOUSTON, TX 77074
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 Caitlin Irby's NPI number?
The NPI number for Caitlin Irby is 1255819801. It was assigned to this individual provider in the NPPES registry on August 4, 2018.
Where is Caitlin Irby located?
Caitlin Irby practices at 7600 Beechnut St, Houston, TX 77074. The listed phone number is (713) 456-5000.
What is Caitlin Irby's specialty?
The primary specialty registered for this NPI is Anesthesiologist Assistant with taxonomy code 367H00000X.
Is Caitlin Irby enrolled in Medicare?
Yes. Caitlin Irby 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 Caitlin Irby's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Caitlin Irby reassigns Medicare benefits to Western Anesthesiology Associates, Inc. (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 Caitlin Irby's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Caitlin Irby affiliated with any hospitals?
According to CMS data, Caitlin Irby is affiliated with Mercy Hospital St Louis.
When was this NPI record last updated?
The NPPES record for Caitlin Irby was last updated on August 4, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years 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. Caitlin Wynne Irby, CAA · NPI 1255819801
Anesthesiologist Assistant physician in Houston, Texas. Individual provider, active in the CMS NPPES registry since August 4, 2018.
## Identity
- **NPI:** 1255819801 (Entity type: Individual)
- **Enumerated:** August 4, 2018
- **Primary specialty:** Anesthesiologist Assistant · taxonomy 367H00000X
- **Sole proprietor:** No
## Practice location
- **Address:** 7600 BEECHNUT ST, Houston, TX 77074-4302
- **Phone:** (713) 456-5000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** Western Anesthesiology Associates, Inc. (NPI 1275646754, Saint Louis, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2018
## Record status
- **NPPES last updated:** August 4, 2018
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Source: [NPI Profile](https://npiprofile.com/npi/1255819801) · Data from the CMS NPPES public registry.