CAITLIN GIAMMUSSO LMFT
NPI 1891591426
Counselor - Mental Health in Glen Ellyn, IL
About Caitlin Giammusso Lmft NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CAITLIN GIAMMUSSO LMFT (NPI 1891591426) is an individual mental health provider in Glen Ellyn, Illinois, licensed in Illinois (166.001945) and active in the NPI registry since February 2025. She is enrolled in Medicare PECOS and is a graduate of Other (2022).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Caitlin Giammusso Lmft is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Caitlin Giammusso reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Oak Park, IL 60301
- Reassigned Medicare billing, Illinois enrollment
- 55 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Other Providers at the Same Location NPPES 15
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
GLEN ELLYN, IL 60137
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 Caitlin Giammusso's NPI number?
The NPI number for Caitlin Giammusso is 1891591426. It was assigned to this individual provider in the NPPES registry on February 24, 2025.
Where is Caitlin Giammusso located?
Caitlin Giammusso practices at 460 N Main St, Glen Ellyn, IL 60137. The listed phone number is (708) 628-8000.
What is Caitlin Giammusso's specialty?
The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.
Is Caitlin Giammusso enrolled in Medicare?
Yes. Caitlin Giammusso is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Caitlin Giammusso's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Caitlin Giammusso reassigns Medicare benefits to Mosaic Counseling And Wellness LLC (Oak Park, IL). The 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 Caitlin Giammusso's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Caitlin Giammusso accept?
Health plans from Oscar Health list Caitlin Giammusso as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Caitlin Giammusso was last updated on October 8, 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.
# Caitlin Giammusso, LMFT · NPI 1891591426
Mental Health provider in Glen Ellyn, Illinois. Individual provider, active in the CMS NPPES registry since February 24, 2025.
## Identity
- **NPI:** 1891591426 (Entity type: Individual)
- **Enumerated:** February 24, 2025
- **Primary specialty:** Counselor - Mental Health · taxonomy 101YM0800X
- **State license:** 166.001945 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 460 N MAIN ST, Glen Ellyn, IL 60137-5176
- **Phone:** (708) 628-8000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Mosaic Counseling And Wellness LLC (NPI 1851065502, Oak Park, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2022
## Record status
- **NPPES last updated:** October 8, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1891591426) · Data from the CMS NPPES public registry.