KEITH WILLIAMS M.D.
NPI 1851304901
Pediatrics in South Holland, IL
About Keith Williams M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KEITH WILLIAMS M.D. (NPI 1851304901) is an individual pediatrics provider in South Holland, Illinois, licensed in Illinois (036-070902) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (1983).
NPPES Registry Identity
Specialties & Licenses
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
Keith Williams M.d. 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 Reassignment
Medicare enrollment records show Keith Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Oak Lawn, IL 60453
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Advocate Health And Hospitals Corporation
- 4,870 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 2
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60473 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.
SOUTH HOLLAND, IL 60473
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 Keith Williams's NPI number?
The NPI number for Keith Williams is 1851304901. It was assigned to this individual provider in the NPPES registry on August 13, 2006.
Where is Keith Williams located?
Keith Williams practices at 100 W 162nd St, South Holland, IL 60473. The listed phone number is (708) 730-2200.
What is Keith Williams's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Keith Williams enrolled in Medicare?
Yes. Keith 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 organization bills Medicare for Keith Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Keith Williams reassigns Medicare benefits to Advocate Health & Hospitals Corporation (Oak Lawn, 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 Keith Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Keith Williams accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Oscar Health list Keith Williams 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.
When was this NPI record last updated?
The NPPES record for Keith Williams was last updated on December 21, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Keith Williams, M.D. · NPI 1851304901
Pediatrics physician in South Holland, Illinois. Individual provider, active in the CMS NPPES registry since August 13, 2006.
## Identity
- **NPI:** 1851304901 (Entity type: Individual)
- **Enumerated:** August 13, 2006
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** 036-070902 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 W 162ND ST, South Holland, IL 60473-2003
- **Phone:** (708) 730-2200
## 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:** Advocate Health & Hospitals Corporation (NPI 1912936014, Oak Lawn, IL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Illinois College Of Med, class of 1983
## Record status
- **NPPES last updated:** December 21, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1851304901) · Data from the CMS NPPES public registry.