1. Home
  2. Directory
  3. Illinois
  4. Barrington
  5. Chiropractor
  6. NPI Profile

MR. WILLIAM JOHN COX D.C.
NPI 1447374590
Chiropractor in Barrington, IL

Active since March 16, 2007
800 S NORTHWEST HWY STE 101, BARRINGTON, IL 60010(847) 381-1110(847) 713-2362 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Mr. William John Cox D.c. NPPES

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

MR. WILLIAM JOHN COX D.C. (NPI 1447374590) is an individual chiropractor in Barrington, Illinois and active in the NPI registry since March 2007. He is a graduate of Palmer College Chiropractic - Davenport (1982).

NPPES Registry Identity

NPI1447374590
Entity TypeIndividualMale
Primary Taxonomy111N00000X
Provider Legal NameMR. WILLIAM JOHN COXCredential: D.C.
Location Address800 S NORTHWEST HWY STE 101Barrington, IL 60010-4681
Mailing Address800 S Northwest Hwy Ste 101Barrington, IL 60010-4681 · (847) 381-1110 · Fax (847) 713-2362
Phone(847) 381-1110
Fax(847) 713-2362
Sole ProprietorYes
Medical School CMSPalmer College Chiropractic - DavenportGraduated 1982
Enumeration DateMarch 16, 2007
Last NPPES UpdateJuly 8, 2007
✔ NPI 1447374590 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyChiropractorChiropractic Providers
Taxonomy Code111N00000X
Definition
A provider qualified by a Doctor of Chiropractic (D.C.), licensed by the State and who practices chiropractic medicine -that discipline within the healing arts which deals with the nervous system and its relationship to the spinal column and its interrelationship with other body systems.
800 S NORTHWEST HWY STE 101, Barrington, IL 60010
Open in Google Maps ↗

Other Identifiers 2

Other1682650IL · Blue Cross Provider Numbe
Medicare ID-Type Unspecified710570IL · Medicare Number

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mr. William John Cox D.c. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID1850479965
PECOS Enrollment IDI20080415000340

Medicare Billing Reassignment

Medicare enrollment records show William Cox reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Cox Chiropractic, Ltd.
Same address
Chiropractor
800 S NORTHWEST HWY, SUITE 101
Barrington, IL 60010
  • Reassigned Medicare billing, Illinois enrollment
NPI 1225207806 (847) 381-1110

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

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.

Chiropractic manipulative treatment, 3-4 spinal regions 98941
Chiropractic manipulative treatment for 3-4 spinal regions involves a trained professional applying controlled force to specific areas of your spine. This can help alleviate pain, improve physical function, and support your body's natural healing process.
295 services93 patients

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 William Cox's NPI number?

The NPI number for William Cox is 1447374590. It was assigned to this individual provider in the NPPES registry on March 16, 2007.

Where is William Cox located?

William Cox practices at 800 S Northwest Hwy Ste 101, Barrington, IL 60010. The listed phone number is (847) 381-1110.

What is William Cox's specialty?

The primary specialty registered for this NPI is Chiropractor with taxonomy code 111N00000X.

Is William Cox enrolled in Medicare?

Yes. William Cox is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for William Cox's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Cox reassigns Medicare benefits to Cox Chiropractic, Ltd. (Barrington, 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 William Cox's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for William Cox was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.