EARL CHARLES WILLIAMS JR. MD
NPI 1912561077
Emergency Medicine in Crystal Lake, IL
About Earl Charles Williams Jr. Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
EARL CHARLES WILLIAMS JR. MD (NPI 1912561077) is an individual emergency medicine provider in Crystal Lake, Illinois, licensed in Illinois (036167126) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS, is affiliated with Heartland Regional Medical Center, and maintains a secondary practice location in Harvard.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
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
Earl Charles Williams Jr. Md 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
9Medicare enrollment records show Earl Williams reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Harvard, IL 60033
- Reassigned Medicare billing, Illinois enrollment
- 382 clinicians in this Medicare group
Janesville, WI 53548
- Reassigned Medicare billing, Illinois enrollment
- 671 clinicians in this Medicare group
Sterling, IL 61081
- Reassigned Medicare billing, Illinois enrollment
- 356 clinicians in this Medicare group
Peoria, IL 61615
- Reassigned Medicare billing, Illinois enrollment
- 2,944 clinicians in this Medicare group
Alton, IL 62002
- Reassigned Medicare billing, Illinois enrollment
- 65 clinicians in this Medicare group
Belleville, IL 62226
- Reassigned Medicare billing, Illinois enrollment
- 111 clinicians in this Medicare group
Madisonville, KY 42431
- Reassigned Medicare billing, Kentucky enrollment
- 325 clinicians in this Medicare group
Maysville, KY 41056
- Reassigned Medicare billing, Kentucky enrollment
- 828 clinicians in this Medicare group
Newport, TN 37821
- Reassigned Medicare billing, Virginia enrollment
- 679 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.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Heartland Regional Medical Center
Acute Care Hospitals · Marion, ILMercyhealth Hospital & Physician Clinic-Crystal La
Acute Care Hospitals · Crystal Lake, ILSovah Health Danville
Acute Care Hospitals · Danville, VAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60014 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CRYSTAL LAKE, IL 60014
CRYSTAL LAKE, IL 60014
CRYSTAL LAKE, IL 60014
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 Earl Williams's NPI number?
The NPI number for Earl Williams is 1912561077. It was assigned to this individual provider in the NPPES registry on April 24, 2019.
Where is Earl Williams located?
Earl Williams practices at 875 S. Route 31, Crystal Lake, IL 60014. The listed phone number is (815) 356-7494.
What is Earl Williams's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Earl Williams enrolled in Medicare?
Yes. Earl Williams 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 Earl Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Earl Williams reassigns Medicare benefits to 9 organizations: Mercy Harvard Hospital Inc (Harvard, IL), Mercy Health System Corporation (Janesville, WI), Cgh Medical Center (Sterling, IL), Osf Multi-Specialty Group (Peoria, IL), Southeastern Emergency Physicians Of Memphis LLC (Alton, IL) and 4 more organizations, listed in the Medicare section above. 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 Earl Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Earl Williams affiliated with any hospitals?
According to CMS data, Earl Williams is affiliated with Heartland Regional Medical Center, Mercyhealth Hospital & Physician Clinic-Crystal La and Sovah Health Danville.
When was this NPI record last updated?
The NPPES record for Earl Williams was last updated on October 20, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Earl Charles Williams Jr., MD · NPI 1912561077
Emergency Medicine physician in Crystal Lake, Illinois. Individual provider, active in the CMS NPPES registry since April 24, 2019.
## Identity
- **NPI:** 1912561077 (Entity type: Individual)
- **Enumerated:** April 24, 2019
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 036167126 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 875 S. ROUTE 31, Crystal Lake, IL 60014
- **Phone:** (815) 356-7494
## 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:** 9 organizations under Medicare reassignment (form CMS-855R): Mercy Harvard Hospital Inc (NPI 1427001445, Harvard, IL); Mercy Health System Corporation (NPI 1598718603, Janesville, WI); Cgh Medical Center (NPI 1548540636, Sterling, IL); Osf Multi-Specialty Group (NPI 1154908929, Peoria, IL); Southeastern Emergency Physicians Of Memphis LLC (NPI 1437105277, Alton, IL); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** October 20, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1912561077) · Data from the CMS NPPES public registry.