KAREN T KELLER
NPI 1821411208
Nurse Practitioner - Family in Chicago, IL
About Karen T Keller NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KAREN T KELLER (NPI 1821411208) is an individual family provider in Chicago, Illinois, licensed in Illinois (209011228) and active in the NPI registry since January 2014. She is enrolled in Medicare PECOS, is affiliated with Osf Little Company Of Mary Medical Center, and is a graduate of Other (2013).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Karen T Keller is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Karen Keller reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Evergreen Park, IL 60805
- Reassigned Medicare billing, Illinois enrollment
- 67 clinicians in this Medicare group
Evergreen Park, IL 60805
- Reassigned Medicare billing, Illinois enrollment
- 183 clinicians in this Medicare group
Peoria, IL 61615
- Reassigned Medicare billing, Illinois enrollment
- 2,944 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Osf Little Company Of Mary Medical Center
Acute Care Hospitals · Evergreen Park, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60637 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
CHICAGO, IL 60637
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 Karen Keller's NPI number?
The NPI number for Karen Keller is 1821411208. It was assigned to this individual provider in the NPPES registry on January 21, 2014.
Where is Karen Keller located?
Karen Keller practices at 5841 S Maryland Ave M1035, Chicago, IL 60637. The listed phone number is (773) 926-9116.
What is Karen Keller's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Karen Keller enrolled in Medicare?
Yes. Karen Keller is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Karen Keller's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Keller reassigns Medicare benefits to 3 organizations: Little Company Of Mary Affiliated Services Inc (Evergreen Park, IL), Osf Healthcare System (Evergreen Park, IL) and Osf Multi-Specialty Group (Peoria, IL). Each 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 Karen Keller's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karen Keller accept?
Health plans from Ambetter Health and Ambetter Health of Delaware list Karen Keller 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.
Is Karen Keller affiliated with any hospitals?
According to CMS data, Karen Keller is affiliated with Osf Little Company Of Mary Medical Center.
When was this NPI record last updated?
The NPPES record for Karen Keller was last updated on April 4, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years 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.
# Karen T Keller · NPI 1821411208
Family physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since January 21, 2014.
## Identity
- **NPI:** 1821411208 (Entity type: Individual)
- **Enumerated:** January 21, 2014
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 209011228 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 5841 S MARYLAND AVE, M1035, Chicago, IL 60637-1447
- **Phone:** (773) 926-9116
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Little Company Of Mary Affiliated Services Inc (NPI 1588617260, Evergreen Park, IL); Osf Healthcare System (NPI 1215572045, Evergreen Park, IL); Osf Multi-Specialty Group (NPI 1154908929, Peoria, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** April 4, 2016
- **Other identifiers:** Other 209011228 (IL)
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Source: [NPI Profile](https://npiprofile.com/npi/1821411208) · Data from the CMS NPPES public registry.