Dr. Nathan Michael Larsen, MD
- Part D claims, 2024
- 268
- Hospital affiliations
- 5
- Industry payments
- $19
- Medical groups
- 12
- State license
- 1
- Practice address
- 3 Neenah Ctr, Neenah, WI 54956
- Practice phone
- Call (920) 731-4101
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Thedacare Medical Center - Fond Du LAC
Neenah, Wisconsin
Find Dr. Larsen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Nathan Michael Larsen is an emergency medicine physician in Neenah, Wisconsin
Dr. Larsen practices at Thedacare Medical Center - Fond Du LAC in Neenah, Wisconsin.
Dr. Larsen's NPI, 1992887848, was assigned on October 19, 2006. Dr. Larsen graduated from Medical College of Wisconsin in 2004. Dr. Larsen holds Wisconsin license 48825-020.
- NPI
- 1992887848NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4082713060
- NPI enumeration date
- October 19, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (920) 731-4101
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nathan Michael Larsen practices at Thedacare Medical Center - Fond Du LAC in Neenah, Wisconsin
Dr. Larsen's primary practice is Thedacare Medical Center - Fond Du LAC, at 3 Neenah Ctr, Neenah, WI 54956 in Winnebago County. The practice phone is (920) 731-4101.
- Thedacare Medical Center - Fond Du LAC3 Neenah Ctr, Neenah, WI 54956 · Winnebago CountyPhone(920) 731-4101
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Nathan Michael Larsen is affiliated with 6 sites of care and 12 medical groups
Dr. Larsen's primary practice is Thedacare Medical Center - Fond Du LAC in Neenah, Wisconsin. Dr. Larsen is also affiliated with ThedaCare Regional Medical Center-Neenah. The medical group on file is ThedaCare. Dmand AI also links Dr. Larsen to 4 more hospitals and 11 medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nathan Michael Larsen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Larsen practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Thedacare Medical Center - Fond Du LAC | Available with a free account |
| +5 more sites and 11 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nathan Michael Larsen is one of 1,211 emergency medicine physicians in Wisconsin
Emergency medicine is Dr. Larsen's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Larsen is licensed in Wisconsin.
Specialties and state licenses
- Emergency medicine, WisconsinPrimary
Emergency medicine physicians near Dr. Larsen
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Nathan Michael Larsen's patients have a median age of 46
Across all payers, Dmand AI patient panel data puts Dr. Larsen's median patient age at 46, with 56% women.
Dr. Larsen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 46
Patient panel by sex, all payers
- Women56%
- Men44%
Source: Dmand AI Patient Panel Data
Dr. Nathan Michael Larsen wrote 268 Medicare Part D claims in 2024
In 2024, Dr. Larsen wrote 268 Medicare Part D claims for 189 patients. 93% of them were for generic drugs. CMS names the drug for 138 of them, across 7 drugs with 11 or more claims each, at $831 in total drug cost.
Dr. Larsen's Part D claims by kind of drug, 2024
- Generic250 claims93%
- Brand-name18 claims7%
Dr. Larsen's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Larsen's Part D claims, 2024
- Opioids15%39 of 268 claims
- Antibiotics31%83 of 268 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Nathan Michael Larsen takes part in Medicare
Dr. Larsen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Nathan Michael Larsen received $19 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Larsen from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Merck Sharp & Dohme Corporation paid the most, $19.
Companies that paid Dr. Larsen the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Nathan Michael Larsen graduated from Medical College of Wisconsin
Dr. Larsen graduated from Medical College of Wisconsin in 2004.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Nathan Michael Larsen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Nathan Michael Larsen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Nathan Michael Larsen's NPI number?
Dr. Nathan Michael Larsen's NPI number is 1992887848. It was assigned on October 19, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Nathan Michael Larsen?
Dr. Nathan Michael Larsen is an emergency medicine physician in Neenah, Wisconsin. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Nathan Michael Larsen practice?
Dr. Larsen practices at 3 Neenah Ctr, Neenah, WI 54956. Dr. Larsen's primary practice is Thedacare Medical Center - Fond Du LAC in Neenah, Wisconsin. Dmand AI also links Dr. Larsen to 4 hospitals and 11 medical groups.
What is Dr. Nathan Michael Larsen's office phone number?
The practice phone on file for Dr. Larsen is (920) 731-4101.
What is Dr. Nathan Michael Larsen's medical license number?
Dr. Larsen holds Wisconsin license 48825-020.
Which hospitals is Dr. Nathan Michael Larsen affiliated with?
Dr. Larsen is affiliated with ThedaCare Regional Medical Center-Neenah. Dmand AI links Dr. Larsen to 4 more hospitals.
What medical group is Dr. Nathan Michael Larsen part of?
Dr. Larsen is linked to ThedaCare. Dmand AI links Dr. Larsen to 11 more medical groups.
Does Dr. Nathan Michael Larsen accept Medicare?
Yes. CMS lists Dr. Larsen as accepting Medicare assignment.
Where did Dr. Nathan Michael Larsen go to medical school?
Dr. Larsen graduated from Medical College of Wisconsin in 2004.
What drugs does Dr. Nathan Michael Larsen prescribe most?
In 2024 Medicare Part D data, Dr. Larsen's most prescribed drugs by claims were Prednisone, Hydrocodone-Acetaminophen and Ondansetron ODT.
Has Dr. Nathan Michael Larsen received payments from drug or device companies?
CMS Open Payments shows $19 in general payments to Dr. Larsen from 1 company from 2025 to 2025. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Nathan Michael Larsen been practicing?
Dr. Larsen graduated from medical school in 2004, 22 years ago.
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