WILLIAM C HASELOW M.D.
NPI 1811942444
Emergency Medicine in Eau Claire, WI

Q: What is William Haselow's NPI number?

The NPI number for William Haselow is 1811942444. It was assigned to this individual provider in the NPPES registry on May 23, 2006.

Q: What is William Haselow's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Q: When was this NPI record last updated?

The NPPES record for William Haselow was last updated on December 17, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.

Active since May 23, 2006PECOS Enrolled

900 W CLAIREMONT AVE, EAU CLAIRE, WI 54701(414) 290-6715(414) 290-6755 Get Directions Write a Review

NPPES record last updated: December 17, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Dec 17, 2021, May 6, 2019 (2 updates tracked since 2019).

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About William C Haselow M.d. NPPES

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

WILLIAM C HASELOW M.D. (NPI 1811942444) is an individual emergency medicine provider in Eau Claire, Wisconsin, licensed in Wisconsin (30013-020) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS and maintains a secondary practice location in Chippewa Falls.

NPPES Registry Identity

NPI1811942444

Entity TypeIndividualMale

Primary Taxonomy207P00000X

Provider Legal NameWILLIAM C HASELOWCredential: M.D.

Location Address900 W CLAIREMONT AVEEau Claire, WI 54701-6122

Mailing Address111 E Wisconsin Ave, Suite 2000Milwaukee, WI 53202-4815 · (414) 290-6720 · Fax (414) 290-6755

Phone(414) 290-6715

Fax(414) 290-6755

Sole ProprietorNo

Enumeration DateMay 23, 2006

Last NPPES UpdateDecember 17, 20212 updates tracked since enumeration

NPPES CertifiedDecember 17, 2021

✔ NPI 1811942444 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207P00000X

Licenses✔ Licensed in WI · 30013-020✔ Licensed in WI · 30013-20

Definition

An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.

900 W CLAIREMONT AVE, Eau Claire, WI 54701

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Secondary Practice Location 1

Location 12661 County Highway IChippewa Falls, WI 54729-5407 · Phone (414) 290-6715 · Fax (414) 290-6755

Other Identifiers 4

Medicaid31809700WI

Other930068403WI · Medicare Railroad

Other930072839WI · Medicare Railroad

Other930046182WI · Medicare Railroad

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 Haselow 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 Reassignments

Medicare enrollment records show William Haselow reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Ihc Beaver Dam Emergency Physicians, LLC

162 mi

Emergency Medicine

707 S UNIVERSITY AVE
Beaver Dam, WI 53916

Reassigned Medicare billing, Wisconsin enrollment
32 clinicians in this Medicare group

NPI 1912109836 (954) 939-5000

Froedtert & the Medical College Of Wisconsin Community Physicians, Inc.

203 mi

Internal Medicine

W180N8000 TOWN HALL RD
Menomonee Falls, WI 53051

Reassigned Medicare billing, Wisconsin enrollment
2,294 clinicians in this Medicare group

NPI 1568787448 (262) 255-2500

Door County Memorial Hospital

204 mi

Critical Access

323 S 18TH AVE
Sturgeon Bay, WI 54235

Reassigned Medicare billing, Wisconsin enrollment
131 clinicians in this Medicare group

NPI 1093743874 (920) 743-5566

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

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.

Emergency department visit with high level of medical decision making 99285

An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.

27 services27 patients

Emergency department visit with moderate level of medical decision making 99284

An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.

18 services18 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010

A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.

17 services16 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 54701 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.

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.

EDWARD S PISARCIK JR. PA-C

Physician Assistant