Mark Wayne Larsen, MSN-E, FNP-C, CEN
Family Nurse Practitioner · Afton, WY
Mark Wayne Larsen, MSN-E, FNP-C, CEN is a family nurse practitioner with a practice address in Afton, Wyoming, and NPI 1689166266, issued on May 31, 2018. Check the license (Wyoming 1758.1758, as entered in NPPES) with the Wyoming board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark Wayne Larsen
- Credential
- MSN-E, FNP-C, CEN
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 1758.1758 WY
Self-reported in NPPES; status is on the state search - Practice location
- 901 Adams St, Afton, WY 83110
- Phone
- (885) 885-5800
- Enumerated
- May 31, 2018
- Record last updated
- May 31, 2018 (not updated in 8 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 456 in Wyoming → Look up another NPI →
Also registered at 901 Adams St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Wayne Larsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wyoming board licenses this profession
Search for license 1758.1758Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average family nurse practitioner in 2024
237 Medicare Part D claims for 128 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Prednisone37 claims
- Amoxicillin-Clavulanate Potass26 claims
- Albuterol Sulfate Hfa22 claims
- Azithromycin17 claims
- Nitrofurantoin Mono-Macro14 claims
- Lisinopril11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $25.04
1 payment: food and beverage; the largest payer was Pfizer Inc. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Mark Wayne Larsen among 456 family nurse practitioner records in Wyoming
Mark Wayne Larsen, MSN-E, FNP-C, CEN is one of 456 family nurse practitioner records with a practice address in Wyoming. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 56% of them.
- NPI issued2018 · 56% of these records are older, 39% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 64% of these records are
- Record last updated2018 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Wyoming practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 family nurse practitioner records list a practice address in Afton
They are 3 of the 103 NPPES records with a practice address in Afton, and 456 family nurse practitioner records in Wyoming.
All 456 in Wyoming → Every provider in Afton → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Kathy Bella, ARNP FNP-CDiamondville, WY 831101902299787
- Shathena Meeder, NPAfton, WY 831101255203857
- Susan Miner, APRN, FNP-CAfton, WY 831101063012383
- Leslie Hagenstein, DNP, APRN, FNP-BCMarbleton, WY 831131093799132
- Lorri Turner, FNPMarbleton, WY 831131518054782
- Sharron Boatwright, CRNPKemmerer, WY 831011952723678
- Melissa Foster, FNP-CKemmerer, WY 831011205928108
- Kyla Franklin, NPKemmerer, WY 831011770205577
Common questions
What is Mark Wayne Larsen, MSN-E, FNP-C, CEN's NPI number?
Mark Wayne Larsen, MSN-E, FNP-C, CEN's National Provider Identifier (NPI) is 1689166266, issued on May 31, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Mark Wayne Larsen, MSN-E, FNP-C, CEN located?
The NPPES record lists a practice address at 901 Adams St, Afton, WY, 83110. Phone: (885) 885-5800. Providers update this record themselves, so call before visiting.
How can I verify Mark Wayne Larsen, MSN-E, FNP-C, CEN's license?
NPPES lists Wyoming license number 1758.1758, as entered by the provider. Search the Wyoming board that licenses this profession; the NPPES record confirms identity only.
How much does Mark Wayne Larsen, MSN-E, FNP-C, CEN prescribe under Medicare Part D?
In 2024, Mark Wayne Larsen, MSN-E, FNP-C, CEN had 237 Medicare Part D claims for 128 beneficiaries; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.