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JOHN WILLIAMS
NPI 1831286962
Pediatrics - Pediatric Infectious Diseases in Madison, WI

Active since October 09, 2006PECOS EnrolledAccepts Medicare Assignment
1675 HIGHLAND AVE, MADISON, WI 53792(608) 263-0946 Get Directions Write a Review

NPPES record last updated: February 24, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Feb 24, 2025, Oct 11, 2024, Dec 22, 2022 and 1 more (4 updates tracked since 2021).

About John Williams NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN WILLIAMS (NPI 1831286962) is an individual pediatric infectious diseases provider in Madison, Wisconsin, licensed in Wisconsin (84587-20) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Virginia Commonwealth University, School Of Medicine (1994).

NPPES Registry Identity

NPI1831286962
Entity TypeIndividualMale
Primary Taxonomy2080P0208X
Provider Legal NameJOHN WILLIAMS
Location Address1675 HIGHLAND AVEMadison, WI 53792-0001
Mailing Address7974 Uw Health CtMiddleton, WI 53562-5531
Phone(608) 263-0946
Sole ProprietorNo
Medical School CMSVirginia Commonwealth University, School Of MedicineGraduated 1994
Enumeration DateOctober 9, 2006
Last NPPES UpdateFebruary 24, 20254 updates tracked since enumeration
NPPES CertifiedFebruary 24, 2025
✔ NPI 1831286962 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric Infectious DiseasesAllopathic & Osteopathic Physicians
Taxonomy Code2080P0208X
Licenses✔ Licensed in WI · 84587-20✔ Licensed in NH · 23460✔ Licensed in TN · MD34293
Definition
A pediatrician trained to care for children in the diagnosis, treatment and prevention of infectious diseases. This specialist can apply specific knowledge to affect a better outcome for pediatric infections with complicated courses, underlying diseases that predispose to unusual or severe infections, unclear diagnoses, uncommon diseases and complex or investigational treatments.
1675 HIGHLAND AVE, Madison, WI 53792
Open in Google Maps ↗

Secondary Practice Locations 3

Location 13601 Tvc, Third FloorNashville, TN 37232-0001 · Phone (615) 322-3000
Location 21 Medical Center DrLebanon, NH 03756-1000 · Phone (603) 650-5000
Location 3600 Highland AveMadison, WI 53792-0001 · Phone (608) 263-0946

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include HealthPartners.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

John Williams 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 ID1254354988
PECOS Enrollment IDI20241022002253
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show John Williams reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

University Of Wisconsin Medical Foundation, Inc
4.8 mi
Multi-Specialty
7974 UW HEALTH COURT
Middleton, WI 53562
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,832 clinicians in this Medicare group
NPI 1598784555 (608) 829-5485
University Of Pittsburgh Physicians
487 mi
Neurological Surgery
425 W FIFTH ST, EAST LIVERPOOL CITY HOSPITAL
East Liverpool, OH 43920
  • Reassigned Medicare billing, Pennsylvania enrollment
  • 7,114 clinicians in this Medicare group
NPI 1811945793 (330) 386-3195

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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.

ERIN VAN SAMBEEK ERNST RN IBCLC
Registered Nurse (Lactation Consultant)
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 890-8227
CAROLINE NAKAMURA SLP
Speech-Language Pathologist
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 915-0650
CASSIDY LYNN BENDER RN
Registered Nurse
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-7337
DR. ANNE M MARSH M.D.
Pediatrics (Pediatric Hematology-Oncology)
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-9540
TALAL AL HENDAWI MD
Student in an Organized Health Care Education/Training Program
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 890-7221
AMANDA MARIE FABRY OTR, OTD
Occupational Therapist
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 890-5437
EMILY ANN ELDER PHARMD, MPH
Pharmacist (Pediatrics)
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-7337
TODD ROBERT SHELDON M.A.
Audiologist
1675 HIGHLAND AVE
MADISON, WI 53792
Dane County (082) 623-1476

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 John Williams's NPI number?

The NPI number for John Williams is 1831286962. It was assigned to this individual provider in the NPPES registry on October 9, 2006.

Where is John Williams located?

John Williams practices at 1675 Highland Ave, Madison, WI 53792. The listed phone number is (608) 263-0946.

What is John Williams's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Infectious Diseases, with taxonomy code 2080P0208X.

Is John Williams enrolled in Medicare?

Yes. John 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 John Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Williams reassigns Medicare benefits to 2 organizations: University Of Wisconsin Medical Foundation, Inc (Middleton, WI) and University Of Pittsburgh Physicians (East Liverpool, OH). 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 John Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does John Williams accept?

Health plans from HealthPartners list John 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.

When was this NPI record last updated?

The NPPES record for John Williams was last updated on February 24, 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.