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DR. CALVIN B WILLIAMS MD
NPI 1467408658
Pediatrics - Pediatric Rheumatology in Milwaukee, WI

Active since May 26, 2006PECOS Enrolled
9000 W WISCONSIN AVE, PEDIATRIC RHEUMATOLOGY, MILWAUKEE, WI 53226(414) 266-6700(414) 266-6695 Get Directions Write a Review

NPPES record last updated: August 14, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Calvin B Williams Md NPPES

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

DR. CALVIN B WILLIAMS MD (NPI 1467408658) is an individual pediatric rheumatology provider in Milwaukee, Wisconsin, licensed in Wisconsin (44530) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS and maintains a secondary practice location in Appleton.

NPPES Registry Identity

NPI1467408658
Entity TypeIndividualMale
Primary Taxonomy2080P0216X
Provider Legal NameDR. CALVIN B WILLIAMSCredential: MD
Location Address9000 W WISCONSIN AVE, PEDIATRIC RHEUMATOLOGYMilwaukee, WI 53226-4874
Mailing Address9000 W Wisconsin Ave, Pediatric RheumatologyMilwaukee, WI 53226-4874 · (414) 266-6700 · Fax (414) 266-6695
Phone(414) 266-6700
Fax(414) 266-6695
Sole ProprietorNo
Enumeration DateMay 26, 2006
Last NPPES UpdateAugust 14, 2023
NPPES CertifiedAugust 10, 2023
✔ NPI 1467408658 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric RheumatologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0216X
License✔ Licensed in WI · 44530
Definition
A pediatrician who treats diseases of joints, muscle, bones and tendons. A pediatric rheumatologist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and collagen diseases.
9000 W WISCONSIN AVE, Milwaukee, WI 53226
Open in Google Maps ↗

Secondary Practice Location 1

Location 12575 E Evergreen DriveAppleton, WI 54913 · Phone (920) 969-5353 · Fax (414) 337-7201

Other Identifiers 2

Other005000261MHumana
Medicaid1467408658WI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Aspirus Health Plan, CareSource (Common Ground Healthcare) and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Calvin B Williams Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Reassignment

Medicare enrollment records show Calvin Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

The Medical College Of Wisconsin, Inc.
0.1 mi
Internal Medicine
8701 WATERTOWN PLANK RD
Milwaukee, WI 53226
  • Reassigned Medicare billing, Wisconsin enrollment
  • 3,983 clinicians in this Medicare group
NPI 1699720086 (414) 955-7101

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.

MS. LESLIE L. TALBERT NP
Nurse Practitioner (Pediatrics)
9000 W WISCONSIN AVE, PEDIATRIC CRITICAL CARE
MILWAUKEE, WI 53226
Milwaukee County (414) 266-3360
SARAH MARIE RUMLER DO
Pediatrics (Pediatric Hematology-Oncology)
9000 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 955-4170
ALISON COREN
Pediatrics (Pediatric Endocrinology)
9000 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 266-6750
BRANDON PALMER M.D.
Pediatrics
9000 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 337-7050
AIDAN JAMES REID DO
Pediatrics
9000 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 266-6800
KYNDAL LYN HETTICH RD, CSP, CD
Dietitian, Registered
9000 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 266-5938
CARISA MARIE DIMATTINA LCSW
Social Worker (Clinical)
9000 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 581-4004
BREYA LOGAN WHITEFIELD PHD
Psychologist (Clinical)
9000 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 266-2000

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 Calvin Williams's NPI number?

The NPI number for Calvin Williams is 1467408658. It was assigned to this individual provider in the NPPES registry on May 26, 2006.

Where is Calvin Williams located?

Calvin Williams practices at 9000 W Wisconsin Ave Pediatric Rheumatology, Milwaukee, WI 53226. The listed phone number is (414) 266-6700.

What is Calvin Williams's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Rheumatology, with taxonomy code 2080P0216X.

Is Calvin Williams enrolled in Medicare?

Yes. Calvin Williams is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Calvin Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Calvin Williams reassigns Medicare benefits to The Medical College Of Wisconsin, Inc. (Milwaukee, WI). The 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 Calvin Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Calvin Williams accept?

Health plans from Anthem Blue Cross and Blue Shield, Aspirus Health Plan, CareSource (Common Ground Healthcare), Network Health and UnitedHealthcare list Calvin 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 Calvin Williams was last updated on August 14, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.