KELLI SIECZKOWSKI, PLLC
NPI 1851830582
Community/Behavioral Health in Mesa, AZ
About Kelli Sieczkowski, Pllc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KELLI SIECZKOWSKI, PLLC (NPI 1851830582) is a healthcare organization registered as a community/behavioral health in Mesa, Arizona and active in the NPI registry since February 2017. The organization lists Kelli Lynn Sieczkowski, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Kelli Sieczkowski, Pllc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
2Medicare enrollment records show 2 clinicians reassign Medicare billing to Kelli Sieczkowski, PLLC, which bills Medicare for the services they deliver. They are listed nearest first.
Clinicians, nearest first (2)
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 Kelli Sieczkowski, PLLC's NPI number?
The NPI number for Kelli Sieczkowski, PLLC is 1851830582. It was assigned to this organization in the NPPES registry on February 14, 2017.
Where is Kelli Sieczkowski, PLLC located?
Kelli Sieczkowski, PLLC is located at 1930 S Alma School Rd Ste D202, Mesa, AZ 85210. The listed phone number is (480) 630-0316.
What is Kelli Sieczkowski, PLLC's specialty?
The primary specialty registered for this NPI is Community/Behavioral Health with taxonomy code 251S00000X.
Is Kelli Sieczkowski, PLLC enrolled in Medicare?
Yes. Kelli Sieczkowski, PLLC is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Kelli Sieczkowski, PLLC?
According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Clinical Social Worker, reassign their Medicare billing to Kelli Sieczkowski, 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Kelli Sieczkowski, PLLC was last updated on July 8, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Kelli Sieczkowski, Pllc · NPI 1851830582
Community/Behavioral Health organization in Mesa, Arizona. Organization record, active in the CMS NPPES registry since February 14, 2017.
## Identity
- **NPI:** 1851830582 (Entity type: Organization)
- **Enumerated:** February 14, 2017
- **Primary specialty:** Community/Behavioral Health · taxonomy 251S00000X
- **Organization subpart:** No
- **Authorized official:** Kelli Sieczkowski, OWNER
## Practice location
- **Address:** 1930 S ALMA SCHOOL RD STE D202, Mesa, AZ 85210-3045
- **Phone:** (480) 630-0316
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 2 clinicians (Clinical Social Worker) reassign Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 8, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1851830582) · Data from the CMS NPPES public registry.