MRS. LESLIE ANN WILLIAMS FNP
NPI 1962647149
Nurse Practitioner - Family in Centralia, IL
About Mrs. Leslie Ann Williams Fnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MRS. LESLIE ANN WILLIAMS FNP (NPI 1962647149) is an individual family provider in Centralia, Illinois, licensed in Illinois (277000097) and active in the NPI registry since December 2008. She is enrolled in Medicare PECOS, is affiliated with Ssm Health St Mary's Hospital -centralia, and is a graduate of Other (2008).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
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
Mrs. Leslie Ann Williams Fnp 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 Leslie Williams reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Centralia, IL 62801
- Reassigned Medicare billing, Illinois enrollment
- 69 clinicians in this Medicare group
Mount Vernon, IL 62864
- Reassigned Medicare billing, Illinois enrollment
- 296 clinicians in this Medicare group
Mount Vernon, IL 62864
- Reassigned Medicare billing, Illinois enrollment
- 81 clinicians in this Medicare group
Nashville, IL 62263
- Reassigned Medicare billing, Illinois enrollment
- 33 clinicians in this Medicare group
Maryville, IL 62062
- Reassigned Medicare billing, Illinois enrollment
- 124 clinicians in this Medicare group
Staunton, IL 62088
- Reassigned Medicare billing, Illinois enrollment
- 121 clinicians in this Medicare group
Cahokia Heights, IL 62207
- Reassigned Medicare billing, Illinois enrollment
- 68 clinicians in this Medicare group
Lisbon, ND 58054
- Reassigned Medicare billing, North Dakota enrollment
- Also billed through NPI 1184051971 (North Dakota)
- 39 clinicians in this Medicare group
Valley City, ND 58072
- Reassigned Medicare billing, North Dakota enrollment
- 64 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.
Ssm Health St Mary's Hospital -Centralia
Acute Care Hospitals · Centralia, ILGood Samaritan Regional Hlth Center
Acute Care Hospitals · Mount Vernon, ILWashington County Hospital
Critical Access Hospitals · Nashville, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 62801 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Leslie Williams's NPI number?
The NPI number for Leslie Williams is 1962647149. It was assigned to this individual provider in the NPPES registry on December 2, 2008.
Where is Leslie Williams located?
Leslie Williams practices at 1998 State Route 161, Centralia, IL 62801. The listed phone number is (618) 339-2114.
What is Leslie Williams's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Leslie Williams enrolled in Medicare?
Yes. Leslie 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 Leslie Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leslie Williams reassigns Medicare benefits to 9 organizations: Midwest Emergency Centralia Campus Associates, Inc (Centralia, IL), Physician Services Corporation Of Southern Illinois Inc. (Mount Vernon, IL), Midwest Emergency Good Samaritan, Inc (Mount Vernon, IL), Washington County Hospital District (Nashville, IL), Midwest Inpatient Anderson Health, Inc (Maryville, 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 Leslie Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Leslie Williams accept?
Health plans from Blue Cross Blue Shield of North Dakota, Sanford Health Plan and UnitedHealthcare list Leslie 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.
Is Leslie Williams affiliated with any hospitals?
According to CMS data, Leslie Williams is affiliated with Ssm Health St Mary's Hospital -Centralia, Good Samaritan Regional Hlth Center and Washington County Hospital.
When was this NPI record last updated?
The NPPES record for Leslie Williams was last updated on February 4, 2022. 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.
# Mrs. Leslie Ann Williams, FNP · NPI 1962647149
Family physician in Centralia, Illinois. Individual provider, active in the CMS NPPES registry since December 2, 2008.
## Identity
- **NPI:** 1962647149 (Entity type: Individual)
- **Enumerated:** December 2, 2008
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 277000097 (Illinois)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1998 STATE ROUTE 161, Centralia, IL 62801-6754
- **Phone:** (618) 339-2114
## 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): Midwest Emergency Centralia Campus Associates, Inc (NPI 1396034245, Centralia, IL); Physician Services Corporation Of Southern Illinois Inc. (NPI 1831101807, Mount Vernon, IL); Midwest Emergency Good Samaritan, Inc (NPI 1629367578, Mount Vernon, IL); Washington County Hospital District (NPI 1659321560, Nashville, IL); Midwest Inpatient Anderson Health, Inc (NPI 1821758608, Maryville, IL); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2008
## Record status
- **NPPES last updated:** February 4, 2022
- **Other identifiers:** Other 209007351 (IL)
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Source: [NPI Profile](https://npiprofile.com/npi/1962647149) · Data from the CMS NPPES public registry.