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DR. JOHN ELLIS WILLIAMSON JR. D.O.
NPI 1629017108
Emergency Medicine - Emergency Medical Services in Morris, IL

Active since June 06, 2006PECOS EnrolledAccepts Medicare Assignment
91.8/100
CMS Quality Rating
150 W HIGH ST, MORRIS, IL 60450(815) 942-2932 Get Directions Write a Review

NPPES record last updated: September 27, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Apr 4, 2023, Mar 9, 2023 (2 updates tracked since 2023).

About Dr. John Ellis Williamson Jr. D.o. NPPES

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

DR. JOHN ELLIS WILLIAMSON JR. D.O. (NPI 1629017108) is an individual emergency medical services provider in Morris, Illinois, licensed in Illinois (036-109152) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Morris Hospital & Healthcare Centers, and maintains 4 additional practice locations.

NPPES Registry Identity

NPI1629017108
Entity TypeIndividualMale
Primary Taxonomy207PE0004X
Provider Legal NameDR. JOHN ELLIS WILLIAMSON JR.Credential: D.O.
Location Address150 W HIGH STMorris, IL 60450-1463
Mailing Address10500 Deer Chase AveOrland Park, IL 60467-9013 · (708) 364-1253
Phone(815) 942-2932
Sole ProprietorNo
Medical School CMSOtherGraduated 1995
Enumeration DateJune 6, 2006
Last NPPES UpdateSeptember 27, 20232 updates tracked since enumeration
NPPES CertifiedSeptember 27, 2023
✔ NPI 1629017108 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency Medicine · Emergency Medical ServicesAllopathic & Osteopathic Physicians
Taxonomy Code207PE0004X
License✔ Licensed in IL · 036-109152
Definition
An emergency medicine physician who specializes in non-hospital based emergency medical services (e.g., disaster site, accident scene, transport vehicle, etc.) to provide pre-hospital assessment, treatment, and transport patients.
Also ListedEmergency MedicineTaxonomy 207P00000X · License 036109152 (IL)
150 W HIGH ST, Morris, IL 60450
Open in Google Maps ↗

Secondary Practice Locations 4

Location 1201 S 14th StHerrin, IL 62948-3631 · Phone (618) 942-2171
Location 2405 W Jackson StCarbondale, IL 62901-1462 · Phone (618) 549-0721
Location 32 S Hospital DrMurphysboro, IL 62966-3333 · Phone (618) 684-3156
Location 41000 Health Center DrMattoon, IL 61938-4644 · Phone (217) 258-2551 · Fax (217) 258-2256

Other Identifiers 1

Medicaid036109152-1IL

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

Dr. John Ellis Williamson Jr. D.o. 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.

PECOS PAC ID7719950658
PECOS Enrollment IDI20070713000171
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 Reassignments

5

Medicare enrollment records show John Williamson reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Epic Group-Emergency Physicians An Illinois Concern S.C.
Same address
Emergency Medicine
150 W HIGH ST
Morris, IL 60450
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: Epic Group-Emergency Physicians An Illinois Concern Sc
  • 23 clinicians in this Medicare group
NPI 1447283569 (815) 942-0553
Aurora Emergency Physicians, LLC
20 mi
Emergency Medicine
1122 WEST VETERANS PARKWAY
Yorkville, IL 60560
  • Reassigned Medicare billing, Illinois enrollment
  • 116 clinicians in this Medicare group
NPI 1407379423 (630) 466-8200
Sarah Bush Lincoln Health Center
130 mi
Family Medicine
1000 HEALTH CENTER DR
Mattoon, IL 61938
  • Reassigned Medicare billing, Illinois enrollment
  • 652 clinicians in this Medicare group
NPI 1568581379 (217) 258-2525
Riverview Hospital
156 mi
General Acute Care Hospital
395 WESTFIELD RD
Noblesville, IN 46060
  • Reassigned Medicare billing, Indiana enrollment
  • 303 clinicians in this Medicare group
NPI 1225275928 (317) 773-0760
Southern Illinois Medical Services, Nfp
254 mi
Internal Medicine
1239 E MAIN ST
Carbondale, IL 62901
  • Reassigned Medicare billing, Illinois enrollment
  • 702 clinicians in this Medicare group
NPI 1770656837 (618) 457-5200

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 4

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.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
426 services395 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
252 services227 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
156 services152 patients
Emergency department visit with low level of medical decision making 99283
An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.
42 services38 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Morris Hospital & Healthcare Centers

Acute Care Hospitals · Morris, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140101
Location150 W High StMorris, IL 60450 · Grundy County
Emergency services Birthing friendly

Sarah Bush Lincoln Health Center

Acute Care Hospitals · Mattoon, IL
1/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140189
Location1000 Health Center Drive P O Box 372Mattoon, IL 61938 · Coles County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60450 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
$85.71 typical visit price
range $54.80 – $168.44
Typical copayment $21.42 (range $13.70 – $42.11)
Most-billed visit code 99203
Established Patient
$97.25 typical visit price
range $17.16 – $136.56
Typical copayment $24.31 (range $4.29 – $34.14)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

91.8/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality75.59
Promoting Interoperability100
Improvement Activities40

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.

MORRIS HOSPITAL
Clinical Medical Laboratory
150 W HIGH ST
MORRIS, IL 60450
Grundy County (815) 942-2932
REGGIE A FLECK MNT
Dietitian, Registered
150 W HIGH ST
MORRIS, IL 60450
Grundy County (815) 942-2932
KATE-LYNN M OLSON-GEIER P.A.
Physician Assistant (Medical)
150 W HIGH ST
MORRIS, IL 60450
Grundy County (815) 942-2932
MARK D CROCKETT M.D.
Emergency Medicine
150 W HIGH ST
MORRIS, IL 60450
Grundy County (815) 942-2932
LAKSHMI ANUBROLU MD
Internal Medicine
150 W HIGH ST
MORRIS, IL 60450
Grundy County (815) 942-2932
DR. BIREN M. PATEL M.D.
Radiology (Diagnostic Radiology)
150 W HIGH ST
MORRIS, IL 60450
Grundy County (815) 942-2932
NANCY A STEWART MNT
Dietitian, Registered
150 W HIGH ST
MORRIS, IL 60450
Grundy County (815) 942-2932
SOUTHWEST DIABETES ENDOCRINOLOGY ASSOCIATES SC
Internal Medicine (Endocrinology, Diabetes & Metabolism)
150 W HIGH ST
MORRIS, IL 60450
Grundy County (815) 942-2932

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 John Williamson's NPI number?

The NPI number for John Williamson is 1629017108. It was assigned to this individual provider in the NPPES registry on June 6, 2006.

Where is John Williamson located?

John Williamson practices at 150 W High St, Morris, IL 60450. The listed phone number is (815) 942-2932.

What is John Williamson's specialty?

The primary specialty registered for this NPI is Emergency Medicine, specializing in Emergency Medical Services, with taxonomy code 207PE0004X.

Is John Williamson enrolled in Medicare?

Yes. John Williamson 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 John Williamson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Williamson reassigns Medicare benefits to 5 organizations: Epic Group-Emergency Physicians An Illinois Concern S.C. (Morris, IL), Aurora Emergency Physicians, LLC (Yorkville, IL), Sarah Bush Lincoln Health Center (Mattoon, IL), Riverview Hospital (Noblesville, IN) and Southern Illinois Medical Services, Nfp (Carbondale, 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 John Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is John Williamson affiliated with any hospitals?

According to CMS data, John Williamson is affiliated with Morris Hospital & Healthcare Centers and Sarah Bush Lincoln Health Center.

When was this NPI record last updated?

The NPPES record for John Williamson was last updated on September 27, 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.