ZACHARY TODD TIERNEY MD
NPI 1609562966
Emergency Medicine in Denver, CO
About Zachary Todd Tierney Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ZACHARY TODD TIERNEY MD (NPI 1609562966) is an individual emergency medicine provider in Denver, Colorado, licensed in Colorado (DR.0077968) and active in the NPI registry since April 2023. He is enrolled in Medicare PECOS and is a graduate of University Of Arkansas College Of Medicine (2023).
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 (PECOS)
Zachary Todd Tierney Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Zachary Tierney reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Denver, CO 80218
- Reassigned Medicare billing, Colorado enrollment
- 53 clinicians in this Medicare group
Denver, CO 80218
- Reassigned Medicare billing, Colorado enrollment
- 52 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 80218 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
DENVER, CO 80218
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 Zachary Tierney's NPI number?
The NPI number for Zachary Tierney is 1609562966. It was assigned to this individual provider in the NPPES registry on April 11, 2023.
Where is Zachary Tierney located?
Zachary Tierney practices at 1375 E 19th Ave, Denver, CO 80218. The listed phone number is (303) 812-2000.
What is Zachary Tierney's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Zachary Tierney enrolled in Medicare?
Yes. Zachary Tierney is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Zachary Tierney's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Zachary Tierney reassigns Medicare benefits to 2 organizations: Ies Colorado PLLC (Denver, CO) and Ies Obs Colorado PLLC (Denver, CO). 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 Zachary Tierney's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Zachary Tierney was last updated on October 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 days 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.
# Zachary Todd Tierney, MD · NPI 1609562966
Emergency Medicine physician in Denver, Colorado. Individual provider, active in the CMS NPPES registry since April 11, 2023.
## Identity
- **NPI:** 1609562966 (Entity type: Individual)
- **Enumerated:** April 11, 2023
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** DR.0077968 (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 1375 E 19TH AVE, Denver, CO 80218-1114
- **Phone:** (303) 812-2000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Ies Colorado PLLC (NPI 1245089028, Denver, CO); Ies Obs Colorado PLLC (NPI 1235988015, Denver, CO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Arkansas College Of Medicine, class of 2023
## Record status
- **NPPES last updated:** October 22, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1609562966) · Data from the CMS NPPES public registry.