DR. STEPHEN J HALLIDAY M.D., MSCI
NPI 1154612554
Internal Medicine - Pulmonary Disease in Madison, WI
About Dr. Stephen J Halliday M.d., Msci NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEPHEN J HALLIDAY M.D., MSCI (NPI 1154612554) is an individual pulmonary disease provider in Madison, Wisconsin, licensed in Wisconsin (70664) and active in the NPI registry since April 2011. He is enrolled in Medicare PECOS, is affiliated with University Of Wi Hospitals & Clinics Authority, and maintains a secondary practice location in Columbia.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Accepted Insurance
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. Stephen J Halliday M.d., Msci 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.
Medicare Billing Reassignments
5Medicare enrollment records show Stephen Halliday reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Middleton, WI 53562
- Reassigned Medicare billing, Wisconsin enrollment
- 2,832 clinicians in this Medicare group
Darlington, WI 53530
- Reassigned Medicare billing, Wisconsin enrollment
- 175 clinicians in this Medicare group
Freeport, IL 61032
- Reassigned Medicare billing, Illinois enrollment
- 391 clinicians in this Medicare group
Freeport, IL 61032
- Reassigned Medicare billing, Illinois and Wisconsin enrollments
- 478 clinicians in this Medicare group
Black River Falls, WI 54615
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1811940331 (Wisconsin)
- 227 clinicians in this Medicare group
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 6
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Of Wi Hospitals & Clinics Authority
Acute Care Hospitals · Madison, WIPhysician 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.
Referred Medical Equipment & Supplies CMS DME claims 2
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
MADISON, WI 53792
MADISON, WI 53792
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 Stephen Halliday's NPI number?
The NPI number for Stephen Halliday is 1154612554. It was assigned to this individual provider in the NPPES registry on April 20, 2011.
Where is Stephen Halliday located?
Stephen Halliday practices at 600 Highland Ave, Madison, WI 53792. The listed phone number is (608) 263-6400.
What is Stephen Halliday's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.
Is Stephen Halliday enrolled in Medicare?
Yes. Stephen Halliday 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 Stephen Halliday's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Halliday reassigns Medicare benefits to 5 organizations: University Of Wisconsin Medical Foundation, Inc (Middleton, WI), Southwest Health Center, Inc. (Darlington, WI), Freeport Regional Health Care Foundation (Freeport, IL), Freeport Memorial Hospital (Freeport, IL) and Black River Health Inc (Black River Falls, WI). 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 Stephen Halliday's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Stephen Halliday accept?
Health plans from Anthem Blue Cross and Blue Shield, Aspirus Health Plan, Group Health Cooperative-SCW, HealthPartners and Quartz and 1 other insurer list Stephen Halliday 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.
Is Stephen Halliday affiliated with any hospitals?
According to CMS data, Stephen Halliday is affiliated with University Of Wi Hospitals & Clinics Authority.
When was this NPI record last updated?
The NPPES record for Stephen Halliday was last updated on January 13, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Dr. Stephen J Halliday, M.D., MSCI · NPI 1154612554
Pulmonary Disease physician in Madison, Wisconsin. Individual provider, active in the CMS NPPES registry since April 20, 2011.
## Identity
- **NPI:** 1154612554 (Entity type: Individual)
- **Enumerated:** April 20, 2011
- **Primary specialty:** Internal Medicine - Pulmonary Disease · taxonomy 207RP1001X
- **State license:** 70664 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 600 HIGHLAND AVE, Madison, WI 53792
- **Phone:** (608) 263-6400
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): University Of Wisconsin Medical Foundation, Inc (NPI 1598784555, Middleton, WI); Southwest Health Center, Inc. (NPI 1811511272, Darlington, WI); Freeport Regional Health Care Foundation (NPI 1457337016, Freeport, IL); Freeport Memorial Hospital (NPI 1447228788, Freeport, IL); Black River Health Inc (NPI 1003914011, Black River Falls, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Texas Medical School At San Antonio, class of 2011
## Record status
- **NPPES last updated:** January 13, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1154612554) · Data from the CMS NPPES public registry.