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WILLIAM C LEACH M.D.
NPI 1124013891
Pediatrics in Milwaukee, WI

Active since September 19, 2005PECOS Enrolled
10909 W BLUEMOUND RD, MILWAUKEE, WI 53226(414) 258-0606(414) 258-1953 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About William C Leach M.d. NPPES

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

WILLIAM C LEACH M.D. (NPI 1124013891) is an individual pediatrics provider in Milwaukee, Wisconsin, licensed in Wisconsin (25333) and active in the NPI registry since September 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1124013891
Entity TypeIndividualMale
Primary Taxonomy208000000X
Provider Legal NameWILLIAM C LEACHCredential: M.D.
Location Address10909 W BLUEMOUND RDMilwaukee, WI 53226-4247
Mailing Address10909 W Bluemound RdMilwaukee, WI 53226-4247 · (414) 258-0606 · Fax (414) 258-1953
Phone(414) 258-0606
Fax(414) 258-1953
Sole ProprietorNo
Enumeration DateSeptember 19, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1124013891 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in WI · 25333
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
10909 W BLUEMOUND RD, Milwaukee, WI 53226
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Other Identifiers 1

Medicaid30018700WI

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)

William C Leach M.d. 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 William Leach reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Childrens Medical Group Inc
1.4 mi
Pediatrics
9000 W WISCONSIN AVE, MS 958
Milwaukee, WI 53226
  • Reassigned Medicare billing, Wisconsin enrollment
  • Medicare enrollment name: Children's Medical Group Inc
  • 10 clinicians in this Medicare group
NPI 1790732410 (414) 266-7615

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

Physician 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.

New Patient
$82.92 typical visit price
range $53.90 – $163.24
Typical copayment $20.73 (range $13.47 – $40.81)
Most-billed visit code 99203
Established Patient
$95.41 typical visit price
range $17.40 – $133.76
Typical copayment $23.85 (range $4.35 – $33.44)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Leach's NPI number?

The NPI number for William Leach is 1124013891. It was assigned to this individual provider in the NPPES registry on September 19, 2005.

Where is William Leach located?

William Leach practices at 10909 W Bluemound Rd, Milwaukee, WI 53226. The listed phone number is (414) 258-0606.

What is William Leach's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is William Leach enrolled in Medicare?

Yes. William Leach is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for William Leach's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Leach reassigns Medicare benefits to Childrens Medical Group 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 William Leach's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Leach accept?

Health plans from Anthem Blue Cross and Blue Shield, Aspirus Health Plan, CareSource (Common Ground Healthcare), HealthPartners and Network Health and 1 other insurer list William Leach 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 William Leach was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.