WILLIAM B WEIR MD
NPI 1811966781
Emergency Medicine in Milwaukee, WI
About William B Weir Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM B WEIR MD (NPI 1811966781) is an individual emergency medicine provider in Milwaukee, Wisconsin, licensed in Wisconsin (85200) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with Community Memorial Hospital, and is a graduate of Other (2003).
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
William B Weir Md 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
3Medicare enrollment records show William Weir reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Milwaukee, WI 53226
- Reassigned Medicare billing, Wisconsin enrollment
- 3,983 clinicians in this Medicare group
Menomonee Falls, WI 53051
- Reassigned Medicare billing, Wisconsin enrollment
- 2,294 clinicians in this Medicare group
Urbana, IL 61801
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Carle Health Care Incorporated
- 2,516 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 4
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.
Community Memorial Hospital
Acute Care Hospitals · Menomonee Falls, WIFroedtert Memorial Lutheran Hospital
Acute Care Hospitals · Milwaukee, WIFroedtert Community Hospital
Acute Care Hospitals · New Berlin, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53226 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.
MILWAUKEE, WI 53226
MILWAUKEE, WI 53226
MILWAUKEE, WI 53226
MILWAUKEE, WI 53226
MILWAUKEE, WI 53226
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 Weir's NPI number?
The NPI number for William Weir is 1811966781. It was assigned to this individual provider in the NPPES registry on March 14, 2006.
Where is William Weir located?
William Weir practices at 9200 W Wisconsin Ave, Milwaukee, WI 53226. The listed phone number is (414) 955-6450.
What is William Weir's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is William Weir enrolled in Medicare?
Yes. William Weir 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 William Weir's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Weir reassigns Medicare benefits to 3 organizations: The Medical College Of Wisconsin, Inc. (Milwaukee, WI), Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (Menomonee Falls, WI) and Carle Health Medical Group (Urbana, IL). 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 William Weir's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Weir accept?
Health plans from Anthem Blue Cross and Blue Shield list William Weir 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 William Weir affiliated with any hospitals?
According to CMS data, William Weir is affiliated with Community Memorial Hospital, Froedtert Memorial Lutheran Hospital and Froedtert Community Hospital.
When was this NPI record last updated?
The NPPES record for William Weir was last updated on March 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 months 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.
# William B Weir, MD · NPI 1811966781
Emergency Medicine physician in Milwaukee, Wisconsin. Individual provider, active in the CMS NPPES registry since March 14, 2006.
## Identity
- **NPI:** 1811966781 (Entity type: Individual)
- **Enumerated:** March 14, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 85200 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 9200 W WISCONSIN AVE, Milwaukee, WI 53226-3522
- **Phone:** (414) 955-6450 · **Fax:** (414) 955-0082
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): The Medical College Of Wisconsin, Inc. (NPI 1699720086, Milwaukee, WI); Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (NPI 1568787448, Menomonee Falls, WI); Carle Health Medical Group (NPI 1154653947, Urbana, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** March 5, 2025
- **Other identifiers:** Medicaid 1811966781 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1811966781) · Data from the CMS NPPES public registry.