TODD A MAHR MD
NPI 1659374411
Pediatrics - Pediatric Allergy/Immunology in La Crosse, WI
About Todd A Mahr Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TODD A MAHR MD (NPI 1659374411) is an individual pediatric allergy/immunology provider in La Crosse, Wisconsin, licensed in Wisconsin (26831) and active in the NPI registry since May 2005. He is enrolled in Medicare PECOS, is affiliated with Gundersen Lutheran Medical Center, and is a graduate of University Of Wisconsin School Of Medicine (1984).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
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
Todd A Mahr Md 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
3Medicare enrollment records show Todd Mahr reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
La Crosse, WI 54601
- Reassigned Medicare billing, Iowa, Minnesota and Wisconsin enrollments
- 179 clinicians in this Medicare group
La Crosse, WI 54601
- Reassigned Medicare billing, Wisconsin and Minnesota enrollments
- Also billed through NPI 1376593442 (Minnesota)
- 1,457 clinicians in this Medicare group
Decorah, IA 52101
- Reassigned Medicare billing, Iowa enrollment
- 83 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
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.
Gundersen Lutheran Medical Center
Acute Care Hospitals · La Crosse, WIReferred Medical Equipment & Supplies CMS DME claims
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.
LA CROSSE, WI 54601
LA CROSSE, WI 54601
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 Todd Mahr's NPI number?
The NPI number for Todd Mahr is 1659374411. It was assigned to this individual provider in the NPPES registry on May 24, 2005.
Where is Todd Mahr located?
Todd Mahr practices at 1836 South Ave, La Crosse, WI 54601. The listed phone number is (608) 782-7300.
What is Todd Mahr's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Allergy/Immunology, with taxonomy code 2080P0201X.
Is Todd Mahr enrolled in Medicare?
Yes. Todd Mahr 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 Todd Mahr's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Todd Mahr reassigns Medicare benefits to 3 organizations: Gundersen Clinic Ltd (La Crosse, WI), Gundersen Lutheran Medical Center, Inc (La Crosse, WI) and Gundersen Regional Clinics LLC (Decorah, IA). 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 Todd Mahr's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Todd Mahr accept?
Health plans from Anthem Blue Cross and Blue Shield, Aspirus Health Plan, HealthPartners, Oscar Insurance Company and Quartz and 1 other insurer list Todd Mahr 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 Todd Mahr affiliated with any hospitals?
According to CMS data, Todd Mahr is affiliated with Gundersen Lutheran Medical Center.
When was this NPI record last updated?
The NPPES record for Todd Mahr was last updated on October 8, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Todd A Mahr, MD · NPI 1659374411
Pediatric Allergy/Immunology physician in La Crosse, Wisconsin. Individual provider, active in the CMS NPPES registry since May 24, 2005.
## Identity
- **NPI:** 1659374411 (Entity type: Individual)
- **Enumerated:** May 24, 2005
- **Primary specialty:** Pediatrics - Pediatric Allergy/Immunology · taxonomy 2080P0201X
- **State license:** 26831 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 1836 SOUTH AVE, La Crosse, WI 54601-5429
- **Phone:** (608) 782-7300
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Gundersen Clinic Ltd (NPI 1851343115, La Crosse, WI); Gundersen Lutheran Medical Center, Inc (NPI 1619210895, La Crosse, WI); Gundersen Regional Clinics LLC (NPI 1043999071, Decorah, IA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Wisconsin School Of Medicine, class of 1984
## Record status
- **NPPES last updated:** October 8, 2013
- **Other identifiers:** Medicare PIN 0201 (WI); Medicaid 30685900 (WI); Medicare UPIN B54767
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Source: [NPI Profile](https://npiprofile.com/npi/1659374411) · Data from the CMS NPPES public registry.