DR. NATHAN MICHAEL LARSEN M.D.
NPI 1992887848
Emergency Medicine in Waupaca, WI
About Dr. Nathan Michael Larsen M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NATHAN MICHAEL LARSEN M.D. (NPI 1992887848) is an individual emergency medicine provider in Waupaca, Wisconsin, licensed in Wisconsin (48825-020) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, is affiliated with Thedacare Regional Med Ctr - Neenah, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 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
Dr. Nathan Michael Larsen 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.
Medicare Billing Reassignments
12Medicare enrollment records show Nathan Larsen reassigns Medicare billing to 12 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Waupaca, WI 54981
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1013995521 (Wisconsin)
- 110 clinicians in this Medicare group
Wild Rose, WI 54984
- Reassigned Medicare billing, Wisconsin enrollment
- 28 clinicians in this Medicare group
New London, WI 54961
- Reassigned Medicare billing, Wisconsin enrollment
- 56 clinicians in this Medicare group
Wautoma, WI 54982
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1760413777 (Wisconsin)
- 55 clinicians in this Medicare group
Plover, WI 54467
- Reassigned Medicare billing, Wisconsin enrollment
- 2,476 clinicians in this Medicare group
Appleton, WI 54911
- Reassigned Medicare billing, Wisconsin enrollment
- 35 clinicians in this Medicare group
Shawano, WI 54166
- Reassigned Medicare billing, Wisconsin enrollment
- 70 clinicians in this Medicare group
Fond Du Lac, WI 54935
- Reassigned Medicare billing, Wisconsin enrollment
- 606 clinicians in this Medicare group
Marshfield, WI 54449
- Reassigned Medicare billing, Wisconsin enrollment
- 2,540 clinicians in this Medicare group
Neillsville, WI 54456
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1346239373 (Wisconsin)
- 1,283 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.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Thedacare Regional Med Ctr - Neenah
Acute Care Hospitals · Neenah, WIThedacare Regional Medical Center - Appleton Inc
Acute Care Hospitals · Appleton, WIThedacare Medical Center-Waupaca
Critical Access Hospitals · Waupaca, WIBerlin Memorial Hospital
Critical Access Hospitals · Berlin, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54981 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
WAUPACA, WI 54981
WAUPACA, WI 54981
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 Nathan Larsen's NPI number?
The NPI number for Nathan Larsen is 1992887848. It was assigned to this individual provider in the NPPES registry on October 19, 2006.
Where is Nathan Larsen located?
Nathan Larsen practices at 800 Riverside Dr, Waupaca, WI 54981. The listed phone number is (715) 258-1000.
What is Nathan Larsen's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Nathan Larsen enrolled in Medicare?
Yes. Nathan Larsen 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 Nathan Larsen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nathan Larsen reassigns Medicare benefits to 12 organizations: Thedacare Medical Center - Waupaca, Inc. (Waupaca, WI), Thedacare Medical Center - Wild Rose, Inc (Wild Rose, WI), Thedacare Medical Center - New London, Inc. (New London, WI), Thedacare Medical Center - Berlin, Inc. (Wautoma, WI), Mchs Hospitals, Inc. (Plover, WI) and 7 more organizations, listed in the Medicare section above. 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 Nathan Larsen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nathan Larsen accept?
Health plans from CareSource (Common Ground Healthcare) list Nathan Larsen 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 Nathan Larsen affiliated with any hospitals?
According to CMS data, Nathan Larsen is affiliated with Thedacare Regional Med Ctr - Neenah, Thedacare Regional Medical Center - Appleton Inc, Thedacare Medical Center-Waupaca and Berlin Memorial Hospital.
When was this NPI record last updated?
The NPPES record for Nathan Larsen was last updated on November 17, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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. Nathan Michael Larsen, M.D. · NPI 1992887848
Emergency Medicine physician in Waupaca, Wisconsin. Individual provider, active in the CMS NPPES registry since October 19, 2006.
## Identity
- **NPI:** 1992887848 (Entity type: Individual)
- **Enumerated:** October 19, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 48825-020 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 800 RIVERSIDE DR, Waupaca, WI 54981-1943
- **Phone:** (715) 258-1000 · **Fax:** (715) 258-2000
## 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:** 12 organizations under Medicare reassignment (form CMS-855R): Thedacare Medical Center - Waupaca, Inc. (NPI 1780782680, Waupaca, WI); Thedacare Medical Center - Wild Rose, Inc (NPI 1043263999, Wild Rose, WI); Thedacare Medical Center - New London, Inc. (NPI 1538127220, New London, WI); Thedacare Medical Center - Berlin, Inc. (NPI 1992159289, Wautoma, WI); Mchs Hospitals, Inc. (NPI 1386249894, Plover, WI); and 7 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Medical College Of Wisconsin, class of 2004
## Record status
- **NPPES last updated:** November 17, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1992887848) · Data from the CMS NPPES public registry.