WILLIAM I BOSWELL IV PA/AA
NPI 1457464679
Anesthesiologist Assistant in Madison, WI
About William I Boswell Iv Pa/aa NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM I BOSWELL IV PA/AA (NPI 1457464679) is an individual anesthesiologist assistant in Madison, Wisconsin, licensed in Wisconsin (615-17) and active in the NPI registry since August 2006. He is affiliated with Cox Medical Centers, maintains 2 additional practice locations, and is a graduate of Emory University School Of Medicine (1993).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 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
William I Boswell Iv Pa/aa 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
8Medicare enrollment records show William Boswell reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Middleton, WI 53562
- Reassigned Medicare billing, Wisconsin enrollment
- 2,832 clinicians in this Medicare group
Springfield, MO 65807
- Reassigned Medicare billing, Missouri enrollment
- 105 clinicians in this Medicare group
Atlanta, GA 30312
- Reassigned Medicare billing, Georgia enrollment
- 49 clinicians in this Medicare group
Stone Mountain, GA 30087
- Reassigned Medicare billing, Georgia enrollment
- 650 clinicians in this Medicare group
Opelika, AL 36801
- Reassigned Medicare billing, Alabama enrollment
- 95 clinicians in this Medicare group
Loveland, CO 80538
- Reassigned Medicare billing, Colorado enrollment
- 2,596 clinicians in this Medicare group
Greenwood Village, CO 80111
- Reassigned Medicare billing, Colorado enrollment
- 971 clinicians in this Medicare group
Golden, CO 80401
- Reassigned Medicare billing, Colorado enrollment
- 171 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.
Cox Medical Centers
Acute Care Hospitals · Springfield, MOUniversity Of Wi Hospitals & Clinics Authority
Acute Care Hospitals · Madison, WIMedicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 William Boswell's NPI number?
The NPI number for William Boswell is 1457464679. It was assigned to this individual provider in the NPPES registry on August 15, 2006.
Where is William Boswell located?
William Boswell practices at 600 Highland Ave, Madison, WI 53792. The listed phone number is (608) 263-8100.
What is William Boswell's specialty?
The primary specialty registered for this NPI is Anesthesiologist Assistant with taxonomy code 367H00000X.
Is William Boswell enrolled in Medicare?
Yes. William Boswell 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 Boswell's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Boswell reassigns Medicare benefits to 8 organizations: University Of Wisconsin Medical Foundation, Inc (Middleton, WI), Ozark Anesthesia Associates, Inc. (Springfield, MO), Northlake Anesthesia Professionals, LLC (Atlanta, GA), American Anesthesiology Associates Of Georgia, LLC (Stone Mountain, GA), Anesthesia Associates Of East Alabama LLC (Opelika, AL) and 3 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 William Boswell's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Boswell accept?
Health plans from Group Health Cooperative-SCW and Select Health list William Boswell 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 Boswell affiliated with any hospitals?
According to CMS data, William Boswell is affiliated with Cox Medical Centers and University Of Wi Hospitals & Clinics Authority.
When was this NPI record last updated?
The NPPES record for William Boswell was last updated on February 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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 I Boswell IV, PA/AA · NPI 1457464679
Anesthesiologist Assistant physician in Madison, Wisconsin. Individual provider, active in the CMS NPPES registry since August 15, 2006.
## Identity
- **NPI:** 1457464679 (Entity type: Individual)
- **Enumerated:** August 15, 2006
- **Primary specialty:** Anesthesiologist Assistant · taxonomy 367H00000X
- **State license:** 615-17 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 600 HIGHLAND AVE, Madison, WI 53792-0001
- **Phone:** (608) 263-8100
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): University Of Wisconsin Medical Foundation, Inc (NPI 1598784555, Middleton, WI); Ozark Anesthesia Associates, Inc. (NPI 1831109586, Springfield, MO); Northlake Anesthesia Professionals, LLC (NPI 1982637419, Atlanta, GA); American Anesthesiology Associates Of Georgia, LLC (NPI 1528068673, Stone Mountain, GA); Anesthesia Associates Of East Alabama LLC (NPI 1245201771, Opelika, AL); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Emory University School Of Medicine, class of 1993
## Record status
- **NPPES last updated:** February 3, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1457464679) · Data from the CMS NPPES public registry.