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DR. JAMES W BAUER M.D.
NPI 1902249543
Pathology - Anatomic Pathology & Clinical Pathology in Madison, WI

Active since April 13, 2013PECOS EnrolledAccepts Medicare Assignment
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE., MADISON, WI 53792(608) 262-7158 Get Directions Write a Review

NPPES record last updated: April 9, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 9, 2026, Apr 1, 2026, Dec 29, 2016 (3 updates tracked since 2016).

About Dr. James W Bauer M.d. NPPES

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

DR. JAMES W BAUER M.D. (NPI 1902249543) is an individual anatomic pathology & clinical pathology provider in Madison, Wisconsin, licensed in Wisconsin (63449-20) and active in the NPI registry since April 2013. He is enrolled in Medicare PECOS, is affiliated with Mercy Health System Corp, and maintains 4 additional practice locations.

NPPES Registry Identity

NPI1902249543
Entity TypeIndividualMale
Primary Taxonomy207ZP0102X
Provider Legal NameDR. JAMES W BAUERCredential: M.D.
Location AddressUW HOSPITAL AND CLINICS, 600 HIGHLAND AVE.Madison, WI 53792-0001
Mailing Address600 Highland AveMadison, WI 53792-0001 · (608) 262-7158
Phone(608) 262-7158
Sole ProprietorNo
Medical School CMSOtherGraduated 2013
Enumeration DateApril 13, 2013
Last NPPES UpdateApril 9, 20263 updates tracked since enumeration
NPPES CertifiedApril 9, 2026
✔ NPI 1902249543 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPathology · Anatomic Pathology & Clinical PathologyAllopathic & Osteopathic Physicians
Taxonomy Code207ZP0102X
Licenses✔ Licensed in WI · 63449-20✔ Licensed in IL · 036149142
Definition
A pathologist deals with the causes and nature of disease and contributes to diagnosis, prognosis and treatment through knowledge gained by the laboratory application of the biologic, chemical and physical sciences. A pathologist uses information gathered from the microscopic examination of tissue specimens, cells and body fluids, and from clinical laboratory tests on body fluids and secretions for the diagnosis, exclusion and monitoring of disease.
Also ListedPathology · HematologyTaxonomy 207ZH0000X · License 63449-20 (WI), 036149142 (IL)
UW HOSPITAL AND CLINICS, Madison, WI 53792
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Other Names 1

Former Name (1)James William Bauer Md

Secondary Practice Locations 4

Location 11045 W Stephenson StFreeport, IL 61032-4864 · Phone (815) 599-6000
Location 21000 Mineral Point AveJanesville, WI 53548-2982 · Phone (608) 756-6761
Location 38201 E Riverside BlvdRockford, IL 61114-2300 · Phone (815) 971-7000
Location 4901 Grant StHarvard, IL 60033-1821 · Phone (815) 943-5431

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

Dr. James W Bauer M.d. 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 ID7719242726
PECOS Enrollment IDI20190408002771, I20190617000140
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

5

Medicare enrollment records show James Bauer reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mercy Health System Corporation
34 mi
General Acute Care Hospital
1000 MINERAL POINT AVE
Janesville, WI 53548
  • Reassigned Medicare billing, Wisconsin and Illinois enrollments
  • Also billed through NPI 1598718603 (Illinois), NPI 1699728550 (Wisconsin)
  • 1,155 clinicians in this Medicare group
NPI 1093768962 (608) 756-6000
Freeport Regional Health Care Foundation
54 mi
Family Medicine
1036 W STEPHENSON ST
Freeport, IL 61032
  • Reassigned Medicare billing, Illinois enrollment
  • 391 clinicians in this Medicare group
NPI 1457337016 (815) 599-6000
Freeport Memorial Hospital
54 mi
General Acute Care Hospital
1045 W STEPHENSON ST
Freeport, IL 61032
  • Reassigned Medicare billing, Illinois enrollment
  • 478 clinicians in this Medicare group
NPI 1447228788 (815) 599-6000
Rockford Health Physicians
56 mi
Anesthesiology
2400 N ROCKTON AVE
Rockford, IL 61103
  • Reassigned Medicare billing, Illinois enrollment
  • 1,375 clinicians in this Medicare group
NPI 1023275278 (815) 971-5000
Mercy Harvard Hospital Inc
61 mi
Critical Access
901 GRANT ST
Harvard, IL 60033
  • Reassigned Medicare billing, Illinois enrollment
  • 382 clinicians in this Medicare group
NPI 1427001445 (815) 943-5431

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 14

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.

Pathology examination of tissue using a microscope, intermediate complexity 88305
A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.
706 services361 patients
Pathology examination of tissue using a microscope, intermediate complexity 88305
A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.
368 services173 patients
Special stained specimen slides to examine tissue, each additional procedure 88341
Special stained specimen slides are used to analyze tissue in detail. In this process, extra procedures may be needed for a more thorough examination. These involve applying special stains to the tissue on slides, enhancing specific elements for closer study.
103 services26 patients
Special stained specimen slides to examine tissue, initial procedure 88342
This procedure involves the use of specially stained slides to examine tissue samples. The initial process involves obtaining a small tissue sample from your body. This sample is then placed on a slide and stained with special dyes to highlight different structures and elements. The stained slide is then examined under a microscope to help diagnose any potential health issues.
68 services57 patients
Special stained specimen slides to examine tissue including interpretation and report 88313
Special stained specimen slides are used to examine tissue samples. This involves applying special dyes to the tissue, which helps to highlight certain features under a microscope. The findings are then interpreted and a report is provided. This can aid in diagnosing various health conditions.
59 services40 patients
Preparation of tissue for examination by removing any calcium present 88311
This procedure involves treating tissue samples to remove any calcium, which can interfere with the examination. The tissue is soaked in a special solution that safely dissolves the calcium, leaving the tissue intact for accurate analysis. This helps in making precise diagnoses.
55 services48 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Mercy Health System Corp

Acute Care Hospitals · Janesville, WI
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520066
Location1000 Mineral Point AveJanesville, WI 53548 · Rock County
Emergency services Birthing friendly

Mercy Walworth Hospital & Medical Center

Critical Access Hospitals · Lake Geneva, WI
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number521357
LocationN2950 State Road 67Lake Geneva, WI 53147 · Walworth County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 53792 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
$123.69 typical visit price
range $53.90 – $163.24
Typical copayment $30.92 (range $13.47 – $40.81)
Most-billed visit code 99204
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.

DINA MARIE PITTA MD
Surgery
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-6400
CAN M SAVASMAN M.D.
Student in an Organized Health Care Education/Training Program
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, H4/831
MADISON, WI 53792
Dane County (608) 262-7158
JUDITH NIR M.D.
Student in an Organized Health Care Education/Training Program
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, H4/831
MADISON, WI 53792
Dane County (608) 263-0572
MADELYN KAY ALVAREZ MD
Internal Medicine
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, H4/831
MADISON, WI 53792
Dane County (608) 263-5660
DR. IAN JOSEPH KOSZEWSKI M.D.
Otolaryngology
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, H4/831
MADISON, WI 53792
Dane County (608) 263-0192
DR. AMIN AFRAZI MD,PH.D
Surgery
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, H4/831
MADISON, WI 53792
Dane County (608) 263-1377
DANIEL R MATSON
Pathology (Hematology)
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVENUE
MADISON, WI 53792
Dane County (608) 263-8443
MEGAN E PETERS M.D.
Pediatrics (Pediatric Critical Care Medicine)
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8049

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 James Bauer's NPI number?

The NPI number for James Bauer is 1902249543. It was assigned to this individual provider in the NPPES registry on April 13, 2013. The provider is also known as James William Bauer MD.

Where is James Bauer located?

James Bauer practices at Uw Hospital And Clinics 600 Highland Ave., Madison, WI 53792. The listed phone number is (608) 262-7158.

What is James Bauer's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology & Clinical Pathology, with taxonomy code 207ZP0102X.

Is James Bauer enrolled in Medicare?

Yes. James Bauer 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 James Bauer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), James Bauer reassigns Medicare benefits to 5 organizations: Mercy Health System Corporation (Janesville, WI), Freeport Regional Health Care Foundation (Freeport, IL), Freeport Memorial Hospital (Freeport, IL), Rockford Health Physicians (Rockford, IL) and Mercy Harvard Hospital Inc (Harvard, IL). 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 James Bauer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is James Bauer affiliated with any hospitals?

According to CMS data, James Bauer is affiliated with Mercy Health System Corp and Mercy Walworth Hospital & Medical Center.

When was this NPI record last updated?

The NPPES record for James Bauer was last updated on April 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.