BRIAN S WILLIAMS M.D.
NPI 1396076618
Hospitalist in Madison, WI
About Brian S Williams M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
BRIAN S WILLIAMS M.D. (NPI 1396076618) is an individual hospitalist provider in Madison, Wisconsin, licensed in Wisconsin (69345) and active in the NPI registry since January 2010. He is enrolled in Medicare PECOS, is affiliated with University Of Wi Hospitals & Clinics Authority, and is a graduate of Other (2009).
NPPES Registry Identity
Specialties & Licenses 3
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
Brian S 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
2Medicare enrollment records show Brian Williams reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Madison, WI 53715
- Reassigned Medicare billing, Wisconsin enrollment
- 1,377 clinicians in this Medicare group
Middleton, WI 53562
- Reassigned Medicare billing, Wisconsin enrollment
- 2,832 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
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Of Wi Hospitals & Clinics Authority
Acute Care Hospitals · Madison, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53792 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
MADISON, WI 53792
MADISON, WI 53792
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 Brian Williams's NPI number?
The NPI number for Brian Williams is 1396076618. It was assigned to this individual provider in the NPPES registry on January 26, 2010.
Where is Brian Williams located?
Brian Williams practices at 1675 Highland Ave, Madison, WI 53792. The listed phone number is (608) 263-8558.
What is Brian Williams's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Brian Williams enrolled in Medicare?
Yes. Brian 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 Brian Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Brian Williams reassigns Medicare benefits to 2 organizations: Dean Health Systems, Inc (Madison, WI) and University Of Wisconsin Medical Foundation, Inc (Middleton, WI). 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 Brian Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Brian Williams affiliated with any hospitals?
According to CMS data, Brian Williams is affiliated with University Of Wi Hospitals & Clinics Authority.
When was this NPI record last updated?
The NPPES record for Brian Williams was last updated on January 7, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Brian S Williams, M.D. · NPI 1396076618
Hospitalist physician in Madison, Wisconsin. Individual provider, active in the CMS NPPES registry since January 26, 2010.
## Identity
- **NPI:** 1396076618 (Entity type: Individual)
- **Enumerated:** January 26, 2010
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 69345 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 1675 HIGHLAND AVE, Madison, WI 53792-4223
- **Phone:** (608) 263-8558
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Dean Health Systems, Inc (NPI 1053358846, Madison, WI); University Of Wisconsin Medical Foundation, Inc (NPI 1598784555, Middleton, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** January 7, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1396076618) · Data from the CMS NPPES public registry.