Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

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

Q: 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.

Q: What is William Leach's specialty?

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

Q: 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 28 days 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.

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: August 02, 2026.

On this page

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, and ordering and referring status from the CMS PECOS system.

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.

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.

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 28 days 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.