CRYSTAL LAKE IMMEDIATE CARE PHYSICIANS LTD.
NPI 1538517198
Emergency Medicine in Crystal Lake, IL
About Crystal Lake Immediate Care Physicians Ltd. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CRYSTAL LAKE IMMEDIATE CARE PHYSICIANS LTD. (NPI 1538517198) is a healthcare organization registered as an emergency medicine in Crystal Lake, Illinois and active in the NPI registry since May 2016. The organization lists Mark Thompson, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Crystal Lake Immediate Care Physicians Ltd. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
40Medicare enrollment records show 40 clinicians reassign Medicare billing to Crystal Lake Immediate Care Physicians Ltd., which bills Medicare for the services they deliver. Of these, 3 practice at this address and 18 within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 4
Nearest to this location (20)
See all 40Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Crystal Lake Immediate Care Physicians Ltd.'s NPI number?
The NPI number for Crystal Lake Immediate Care Physicians Ltd. is 1538517198. It was assigned to this organization in the NPPES registry on May 24, 2016.
Where is Crystal Lake Immediate Care Physicians Ltd. located?
Crystal Lake Immediate Care Physicians Ltd. is located at 525 E Congress Pkwy Suite 100, Crystal Lake, IL 60014. The listed phone number is (815) 479-7490.
What is Crystal Lake Immediate Care Physicians Ltd.'s specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Crystal Lake Immediate Care Physicians Ltd. enrolled in Medicare?
Yes. Crystal Lake Immediate Care Physicians Ltd. is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Crystal Lake Immediate Care Physicians Ltd.?
According to the CMS Revalidation Reassignment List (October 2026 release), 40 clinicians in 4 Medicare specialties reassign their Medicare billing to Crystal Lake Immediate Care Physicians Ltd.. A 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 the clinician's services. The largest specialties are Emergency Medicine (22), Nurse Practitioner (10) and Family Practice (7). Of these, 3 practice at this address and 18 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Crystal Lake Immediate Care Physicians Ltd. was last updated on February 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Crystal Lake Immediate Care Physicians Ltd. · NPI 1538517198
Emergency Medicine organization in Crystal Lake, Illinois. Organization record, active in the CMS NPPES registry since May 24, 2016.
## Identity
- **NPI:** 1538517198 (Entity type: Organization)
- **Enumerated:** May 24, 2016
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **Organization subpart:** No
- **Authorized official:** Mark Thompson, PRESIDENT
## Practice location
- **Address:** 525 E CONGRESS PKWY, SUITE 100, Crystal Lake, IL 60014-6245
- **Phone:** (815) 479-7490
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 40 clinicians in 4 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Emergency Medicine (22), Nurse Practitioner (10), Family Practice (7); 3 practice at this address and 18 within 10 miles; [full list](https://npiprofile.com/npi/1538517198/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 27, 2026
- **Other identifiers:** Medicaid 1538517198 (IL)
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Source: [NPI Profile](https://npiprofile.com/npi/1538517198) · Data from the CMS NPPES public registry.