IES OBS ARIZONA PLLC
NPI 1356006670
Emergency Medicine in Tucson, AZ
About Ies Obs Arizona Pllc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
IES OBS ARIZONA PLLC (NPI 1356006670) is a healthcare organization registered as an emergency medicine in Tucson, Arizona and active in the NPI registry since November 2021. The organization lists Nestor Zenarosa, Authorized Official, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Ies Obs Arizona Pllc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
41Medicare enrollment records show 41 clinicians reassign Medicare billing to Ies Obs Arizona PLLC, which bills Medicare for the services they deliver. Of these, 6 practice at this address and 22 within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 3
Nearest to this location (20)
See all 41Tucson, AZ 85712
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Ies Obs Arizona PLLC's NPI number?
The NPI number for Ies Obs Arizona PLLC is 1356006670. It was assigned to this organization in the NPPES registry on November 2, 2021.
Where is Ies Obs Arizona PLLC located?
Ies Obs Arizona PLLC is located at 5301 E Grant Rd, Tucson, AZ 85712. The listed phone number is (469) 420-5527.
What is Ies Obs Arizona PLLC's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Ies Obs Arizona PLLC enrolled in Medicare?
Yes. Ies Obs Arizona PLLC is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Ies Obs Arizona PLLC?
According to the CMS Revalidation Reassignment List (October 2026 release), 41 clinicians in 3 Medicare specialties reassign their Medicare billing to Ies Obs Arizona PLLC. A 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 the clinician's services. The largest specialties are Emergency Medicine (32), Nurse Practitioner (5) and Pediatric Medicine (4). Of these, 6 practice at this address and 22 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Ies Obs Arizona PLLC was last updated on November 22, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Ies Obs Arizona Pllc · NPI 1356006670
Emergency Medicine organization in Tucson, Arizona. Organization record, active in the CMS NPPES registry since November 2, 2021.
## Identity
- **NPI:** 1356006670 (Entity type: Organization)
- **Enumerated:** November 2, 2021
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **Organization subpart:** No
- **Authorized official:** Nestor Zenarosa, AUTHORIZED OFFICIAL
## Practice location
- **Address:** 5301 E GRANT RD, Tucson, AZ 85712-2805
- **Phone:** (469) 420-5527
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 41 clinicians in 3 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Emergency Medicine (32), Nurse Practitioner (5), Pediatric Medicine (4); 6 practice at this address and 22 within 10 miles; [full list](https://npiprofile.com/npi/1356006670/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** November 22, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1356006670) · Data from the CMS NPPES public registry.