PATRICK EMERSON DAY MD
NPI 1003376138
Pediatrics - Pediatric Cardiology in Austin, TX
About Patrick Emerson Day Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
PATRICK EMERSON DAY MD (NPI 1003376138) is an individual pediatric cardiology provider in Austin, Texas, licensed in Texas (T6547) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS and is a graduate of Other (2019).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Patrick Emerson Day Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Patrick Day reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Austin, TX 78723
- Reassigned Medicare billing, Texas enrollment
- Medicare enrollment name: Dell Childrens Medical Group
- 576 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.
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.
AUSTIN, TX 78723
AUSTIN, TX 78723
AUSTIN, TX 78723
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 Patrick Day's NPI number?
The NPI number for Patrick Day is 1003376138. It was assigned to this individual provider in the NPPES registry on March 24, 2019.
Where is Patrick Day located?
Patrick Day practices at 4900 Mueller Blvd, Austin, TX 78723. The listed phone number is (512) 324-0000.
What is Patrick Day's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Cardiology, with taxonomy code 2080P0202X.
Is Patrick Day enrolled in Medicare?
Yes. Patrick Day is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Patrick Day's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Patrick Day reassigns Medicare benefits to Dell Children's Medical Group (Austin, TX). 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 Patrick Day's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Patrick Day accept?
Health plans from Blue Cross and Blue Shield of Texas, Oscar Insurance Company and Sendero Health Plans, Local Nonprofit list Patrick Day 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.
When was this NPI record last updated?
The NPPES record for Patrick Day was last updated on June 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Patrick Emerson Day, MD · NPI 1003376138
Pediatric Cardiology physician in Austin, Texas. Individual provider, active in the CMS NPPES registry since March 24, 2019.
## Identity
- **NPI:** 1003376138 (Entity type: Individual)
- **Enumerated:** March 24, 2019
- **Primary specialty:** Pediatrics - Pediatric Cardiology · taxonomy 2080P0202X
- **State license:** T6547 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 4900 MUELLER BLVD, Austin, TX 78723-3079
- **Phone:** (512) 324-0000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Dell Children's Medical Group (NPI 1326072943, Austin, TX), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2019
## Record status
- **NPPES last updated:** June 4, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1003376138) · Data from the CMS NPPES public registry.