Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

MS. Kelli Lynn Sieczkowski, LCSW

Individual provider Clinical Social Worker · NPI 1740459460

MS. Kelli Lynn Sieczkowski, LCSW is a Clinical Social Worker in Flagstaff, Arizona. Qualified in 1998, 28 years ago. Practices with Kelli Sieczkowski PLLC, a 2-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
28
Licensed in
AZ
In the registry since
2008
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

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Practice location Address checks out

408 N Kendrick St Ste 3
Flagstaff, AZ 86001-1582
Phone: (928) 774-6364
Fax: (928) 556-0504
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence LCSW10655 (AZ)

Record details

NPI number1740459460
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorNo
NPI enumeratedFebruary 27, 2008
Last updated in NPPESFebruary 27, 2008

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 1998 (28 years in practice)
Group practice Kelli Sieczkowski Pllc — 2 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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