DAVID WILLIAMS M.D.
NPI 1356325328
Emergency Medicine in Chicago, IL
About David Williams M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DAVID WILLIAMS M.D. (NPI 1356325328) is an individual emergency medicine provider in Chicago, Illinois, licensed in Pennsylvania (MD447590) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS, is affiliated with St Bernard Hospital, and is a graduate of Harvard Medical School (1991).
NPPES Registry Identity
Specialties & Licenses 2
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
David 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 Reassignments
15Medicare enrollment records show David Williams reassigns Medicare billing to 15 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chicago, IL 60621
- Reassigned Medicare billing, Illinois enrollment
- 49 clinicians in this Medicare group
Chicago, IL 60617
- Reassigned Medicare billing, Illinois enrollment
- 21 clinicians in this Medicare group
Chicago, IL 60629
- Reassigned Medicare billing, Illinois enrollment
- 982 clinicians in this Medicare group
Chicago, IL 60624
- Reassigned Medicare billing, Illinois enrollment
- 4,870 clinicians in this Medicare group
Aurora, IL 60504
- Reassigned Medicare billing, Illinois enrollment
- 116 clinicians in this Medicare group
Murphy, NC 28906
- Reassigned Medicare billing, North Carolina enrollment
- 88 clinicians in this Medicare group
Clemmons, NC 27012
- Reassigned Medicare billing, North Carolina enrollment
- 159 clinicians in this Medicare group
Kernersville, NC 27284
- Reassigned Medicare billing, North Carolina enrollment
- 158 clinicians in this Medicare group
Wilkes Barre, PA 18764
- Reassigned Medicare billing, Pennsylvania enrollment
- Medicare enrollment name: Emergency Care Services Of Pennsylvania PC
- 329 clinicians in this Medicare group
Griffin, GA 30224
- Reassigned Medicare billing, Georgia enrollment
- 208 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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Bernard Hospital
Acute Care Hospitals · Chicago, ILSouth Shore Hospital
Acute Care Hospitals · Chicago, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60615 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 David Williams's NPI number?
The NPI number for David Williams is 1356325328. It was assigned to this individual provider in the NPPES registry on December 2, 2005.
Where is David Williams located?
David Williams practices at 4801 S Drexel Blvd, Chicago, IL 60615. The listed phone number is (708) 229-9500.
What is David Williams's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is David Williams enrolled in Medicare?
Yes. David 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 David Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), David Williams reassigns Medicare benefits to 15 organizations: Foundation For Emergency Services (Chicago, IL), Heartland Emergency Physicians PLLC (Chicago, IL), Cepamerica Illinois LLP (Chicago, IL), Advocate Health And Hospitals Corporation (Chicago, IL), Aurora Emergency Physicians, LLC (Aurora, IL) and 10 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 David Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does David Williams accept?
Health plans from Cigna HealthCare of Florida, Inc., Cigna Healthcare and Oscar Health Maintenance Organization of Florida list David 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 David Williams affiliated with any hospitals?
According to CMS data, David Williams is affiliated with St Bernard Hospital and South Shore Hospital.
When was this NPI record last updated?
The NPPES record for David Williams was last updated on May 29, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# David Williams, M.D. · NPI 1356325328
Emergency Medicine physician in Chicago, Illinois. Individual provider, active in the CMS NPPES registry since December 2, 2005.
## Identity
- **NPI:** 1356325328 (Entity type: Individual)
- **Enumerated:** December 2, 2005
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** MD447590 (Pennsylvania)
- **Sole proprietor:** No
## Practice location
- **Address:** 4801 S DREXEL BLVD, Chicago, IL 60615-1703
- **Phone:** (708) 229-9500
## 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:** 15 organizations under Medicare reassignment (form CMS-855R): Foundation For Emergency Services (NPI 1467468280, Chicago, IL); Heartland Emergency Physicians PLLC (NPI 1346122983, Chicago, IL); Cepamerica Illinois LLP (NPI 1164944369, Chicago, IL); Advocate Health And Hospitals Corporation (NPI 1801838339, Chicago, IL); Aurora Emergency Physicians, LLC (NPI 1508389628, Aurora, IL); and 10 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 1991
## Record status
- **NPPES last updated:** May 29, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1356325328) · Data from the CMS NPPES public registry.