Kelli Sieczkowski, PLLC in Mesa, AZ
This organization bills under NPI 1851830582, an organization record issued on Feb 14, 2017 with the primary taxonomy Community/Behavioral Health Agency. Each clinician who works there has their own NPI and license.
Organization recordNPPES, Aug 2026
1851830582
- Legal name
- Kelli Sieczkowski, PLLC
- Entity
- Type 2 · organization
- Primary taxonomy
- Community/Behavioral Health Agency 251S00000X
- Practice location
- 1930 S ALMA SCHOOL RD STE D202, Mesa, AZ 85210
- Phone
- 480-630-0316
- Mailing address
- Flagstaff, AZ
- Enumerated
- Feb 14, 2017
- Record updated
- Jul 8, 2019
- Authorized official
- Owner (title as filed)
2 clinicians CMS lists with Kelli Sieczkowski in Mesa
- Kelli Sieczkowski, LCSWClinical Social Worker1740459460
- Marjolein Sieczkowski, LCSWClinical Social Worker1457850984
Source: CMS Doctors and Clinicians group affiliations, matched by practice name and city.
Checking an organization
- Confirm the business with the Arizona secretary of state.
- Check the HHS-OIG exclusion list for the organization.
- Verify each clinician on their own record and the state license search.
Common questions
Is an organization NPI a license?
No. An NPI identifies who bills. Facilities and the clinicians who work there are licensed separately by the state.
Source: CMS National Plan and Provider Enumeration System (NPPES), monthly file of Aug 9, 2026 (NPPES files on CMS.gov). An NPI identifies who bills; it is not a license.