NPPES file of Aug 9, 2026

Margaux Rioux, FNP

Family Nurse Practitioner · South Portland, ME

Margaux Rioux, FNP is a family nurse practitioner with a practice address in South Portland, Maine, and NPI 1437964947, issued on Feb 11, 2025. Check the license (Maine CNP251052, as entered in NPPES) with the Maine board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1437964947
Name
Margaux Rioux
Credential
FNP
Primary taxonomy
Family Nurse Practitioner 363LF0000X
License number
CNP251052 ME
Self-reported in NPPES; status is on the state search
Practice location
100 Foden RD Ste 203, South Portland, ME 04106
Phone
(207) 874-1489
Enumerated
Feb 11, 2025
Record last updated
Feb 11, 2025
Medicare enrollment
Enrolled (PECOS I20250409002706); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest family nurse practitioner records → All 1,274 in Maine → Look up another NPI →

Also registered at 100 Foden RD Ste 203

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Christopher CathcartPhysician Assistant1073179230
  2. David Clark, DOFamily Medicine Physician1760910863
  3. Megan Driscoll, MDFamily Medicine Physician1265482152
  4. Bayleigh IsherwoodNurse Practitioner1295217958
  5. Meaghan JohnsonFamily Medicine Physician1932546884
  6. Karyn King, M.D.Family Medicine Physician1952890485

Verify Margaux Rioux in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Maine board licenses this profession
    Search for license CNP251052    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Maine license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Intermed PASouth Portland, ME

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Margaux Rioux among 1,274 family nurse practitioner records in Maine

Margaux Rioux, FNP is one of 1,274 family nurse practitioner records with a practice address in Maine. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2025, is newer than 93% of them.

  • NPI issued2025 · 93% of these records are older, 2% newer
  • In a Medicare fileYes · 77% of these records are
  • In the CMS Doctors and Clinicians fileYes · 64% of these records are
  • Graduated2024 · median 2018 among the 811 with a school on file
  • Record last updated2025 · 46% 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 Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

46 family nurse practitioner records list a practice address in South Portland

They are 46 of the 1,143 NPPES records with a practice address in South Portland, and 1,274 family nurse practitioner records in Maine.

All 1,274 in Maine → Every provider in South Portland → Family Nurse Practitioner nationwide →

The 8 family nurse practitioner records with the nearest ZIP codes

  1. Pamela Argereow, FNPSouth Portland, ME 041061013087758
  2. Lisa Bulthuis, NPSouth Portland, ME 041061689636607
  3. Mary Delois, RN,MSN,F.N.P.-CSouth Portland, ME 041061003963232
  4. Sarah Fuhrman, FNPSouth Portland, ME 041061053380741
  5. Jaime Hare, FNP-CSouth Portland, ME 041061679543219
  6. Duncan Hopkins, MS, FNP-CSouth Portland, ME 041061033233754
  7. Lynn Howard, APRN CNPSouth Portland, ME 041061184624397
  8. Melissa Libby, FNPSouth Portland, ME 041061033170709

Common questions

What is Margaux Rioux, FNP's NPI number?

Margaux Rioux, FNP's National Provider Identifier (NPI) is 1437964947, issued on Feb 11, 2025. An NPI identifies a provider in billing; it is not a license.

Where is Margaux Rioux, FNP located?

The NPPES record lists a practice address at 100 Foden RD Ste 203, South Portland, ME, 04106. Phone: (207) 874-1489. Providers update this record themselves, so call before visiting.

How can I verify Margaux Rioux, FNP's license?

NPPES lists Maine license number CNP251052, as entered by the provider. Search the Maine board that licenses this profession; the NPPES record confirms identity 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.