COLLEEN CALLAHAN LCSW
NPI 1225364441
Social Worker - Clinical in Littleton, CO

Q: What is Colleen Callahan's NPI number?

The NPI number for Colleen Callahan is 1225364441. It was assigned to this individual provider in the NPPES registry on October 22, 2009.

Q: What is Colleen Callahan's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Q: When was this NPI record last updated?

The NPPES record for Colleen Callahan was last updated on October 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months 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.

Active since October 22, 2009PECOS Enrolled

6507 S SANTA FE DR, LITTLETON, CO 80120(303) 730-8858 Get Directions Write a Review

NPPES record last updated: October 21, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Mar 5, 2024, Mar 23, 2021 (2 updates tracked since 2021).

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About Colleen Callahan Lcsw NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

COLLEEN CALLAHAN LCSW (NPI 1225364441) is an individual clinical provider in Littleton, Colorado, licensed in Colorado (CSW.00001313) and active in the NPI registry since October 2009. She is enrolled in Medicare PECOS and maintains a secondary practice location in Denver.

NPPES Registry Identity

NPI1225364441

Entity TypeIndividualFemale

Primary Taxonomy1041C0700X

Provider Legal NameCOLLEEN CALLAHANCredential: LCSW

Location Address6507 S SANTA FE DRLittleton, CO 80120-2910

Mailing Address116 Inverness Dr E Ste 105Englewood, CO 80112-5125 · (037) 308-8583

Phone(303) 730-8858

Sole ProprietorYes

Enumeration DateOctober 22, 2009

Last NPPES UpdateOctober 21, 20252 updates tracked since enumeration

NPPES CertifiedOctober 21, 2025

✔ NPI 1225364441 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers

Taxonomy Code1041C0700X

License✔ Licensed in CO · CSW.00001313

Definition

A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.

6507 S SANTA FE DR, Littleton, CO 80120

Open in Google Maps ↗

Secondary Practice Location 1

Location 15967 W Alamo DrDenver, CO 80123-0893 · Phone (303) 918-8199

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Insurance Company, Select Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Colleen Callahan Lcsw is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Colleen Callahan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Arapahoe Mental Health Center, Inc

Same address

Mental Health (Including Community Mental Health Center)

6507 S SANTA FE DR
Littleton, CO 80120

Reassigned Medicare billing, Colorado enrollment
331 clinicians in this Medicare group

NPI 1437764297 (303) 730-8858

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 80120 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$0.00 typical visit price

range $58.06 – $174.82

Typical copayment $0.00 (range $14.51 – $43.70)

Most-billed visit code NA

Established Patient

$72.20 typical visit price

range $18.88 – $142.79

Typical copayment $18.05 (range $4.72 – $35.69)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

RUBY CHAVEZ BA

Counselor (Mental Health)