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WILLIAM I BOSWELL IV PA/AA
NPI 1457464679
Anesthesiologist Assistant in Madison, WI

Active since August 15, 2006Accepts Medicare Assignment
97.58/100
CMS Quality Rating
600 HIGHLAND AVE, MADISON, WI 53792(608) 263-8100 Get Directions Write a Review

NPPES record last updated: February 3, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Feb 3, 2026, Apr 3, 2023, Feb 2, 2021 (3 updates tracked since 2021).

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

NPI1457464679
Entity TypeIndividualMale
Primary Taxonomy367H00000X
Provider Legal NameWILLIAM I BOSWELL IVCredential: PA/AA
Location Address600 HIGHLAND AVEMadison, WI 53792-0001
Mailing Address7974 Uw Health CtMiddleton, WI 53562-5531
Phone(608) 263-8100
Sole ProprietorNo
Medical School CMSEmory University School Of MedicineGraduated 1993
Enumeration DateAugust 15, 2006
Last NPPES UpdateFebruary 3, 20263 updates tracked since enumeration
NPPES CertifiedFebruary 3, 2026
✔ NPI 1457464679 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologist AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code367H00000X
Licenses✔ Licensed in WI · 615-17✔ Licensed in CO · ANT.0000069✔ Licensed in GA · 002435
Definition
An individual certified by the state to perform anesthesia services under the direct supervision of an anesthesiologist. Anesthesiologist Assistants are required to have a bachelor's degree with a premed curriculum prior to entering a two-year anesthesiology assistant program, which is focused upon the delivery and maintenance of anesthesia care as well as advanced patient monitoring techniques. An Anesthesiologist Assistant must work as a member of the anesthesia care team under the direction of a qualified Anesthesiologist.
600 HIGHLAND AVE, Madison, WI 53792
Open in Google Maps ↗

Secondary Practice Locations 2

Location 11400 E Boulder StColorado Springs, CO 80909-5533 · Phone (720) 848-0000
Location 2380 Hospital Dr, Ste 410Macon, GA 31217-8001 · Phone (478) 746-5644 · Fax (478) 745-4849

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

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.

PECOS PAC ID4183538770
PECOS Enrollment IDI20170110000319, I20250807002995, I20260209000596

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.

Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope 00731
This procedure involves the use of an endoscope, a flexible tube with a light and camera, to examine your esophagus, stomach, or upper small bowel. Anesthesia ensures you are comfortable and pain-free during the procedure.
91 services83 patients
Anesthesia for procedure on gallbladder, pancreas, or liver using an endoscope 00732
This procedure involves using an endoscope, a flexible tube with a light and camera, to examine or treat your gallbladder, pancreas, or liver. Anesthesia is administered to ensure you're comfortable and pain-free during the procedure.
33 services33 patients
Anesthesia for other procedure on large bowel using an endoscope 00811
Anesthesia for an endoscopic procedure on the large bowel ensures comfort and relaxation during the procedure. You'll be given medication to make you drowsy or asleep, eliminating any discomfort. The medication can be administered through a vein or inhaled.
26 services25 patients

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, MO
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260040
Location3801 South National AvenueSpringfield, MO 65807 · Greene County
Emergency services Birthing friendly

University Of Wi Hospitals & Clinics Authority

Acute Care Hospitals · Madison, WI
4/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number520098
Location600 Highland AvenueMadison, WI 53792 · Dane County
Emergency services

Medicare 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.

97.58/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality86.53
Promoting Interoperability100
Improvement Activities40

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.

JASON ALAN CHRISTENSEN PHARMD
Pharmacist
600 HIGHLAND AVE, COMPLIANCE MAIL CODE 2433
MADISON, WI 53792
Dane County (608) 662-0817
LAURA JEAN KOPPLIN MD, PHD
Ophthalmology
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-6070
HAGGI MAZEH MD
Surgery
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 265-8072
DR. SWAPNIL SUNIL LANJEWAR M.D.
Internal Medicine (Infectious Disease)
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-0946
DR. MATTHEW JAMES HOYT M.D.
Anesthesiology
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8100
VANESSA MERCEDES WELTEN MD MPH
Transplant Surgery
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (617) 732-5500
JOHN HENRY NORMAN HARRISON
Anesthesiology
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8100
PIPPA FROUKTE COSPER MD
Radiology (Radiation Oncology)
600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8500

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.

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 6 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.