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

Individual provider Clinical Social Worker · NPI 1225364441

Colleen Callahan, LCSW is a Clinical Social Worker in Littleton, Colorado. Qualified in 2006, 20 years ago. Practices with Arapahoe Mental Health Center Inc, a 124-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Colorado.

Years since qualifying
20
Licensed in
CO
In the registry since
2009
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

6507 S Santa Fe Dr
Littleton, CO 80120-2910
Phone: (303) 730-8858
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 5967 W Alamo Dr, Denver, CO 80123-0893 — (303) 918-8199

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence CSW.00001313 (CO)

Record details

NPI number1225364441
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorYes
NPI enumeratedOctober 22, 2009
Last updated in NPPESOctober 21, 2025
Certification dateOctober 21, 2025

Medicare enrollment

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

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 2006 (20 years in practice)
Group practice Arapahoe Mental Health Center Inc — 124 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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