Margaret Libby, NP-C
Family Nurse Practitioner · South Portland, ME
Margaret Libby, NP-C is a family nurse practitioner with a practice address in South Portland, Maine, and NPI 1619359007, issued on Jun 23, 2015. Check the license (Maine CNP151055, as entered in NPPES) with the Maine board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Margaret Libby
- Credential
- NP-C
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- CNP151055 ME
Self-reported in NPPES; status is on the state search - Practice location
- 100 Foden RD, South Portland, ME 04106
- Phone
- (207) 874-1489
- Enumerated
- Jun 23, 2015
- Record last updated
- Mar 6, 2026
- Fax
- (207) 523-8590
- Medicare enrollment
- Enrolled (PECOS I20150814013350); may accept Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 1,274 in Maine → Look up another NPI →
Also registered at 100 Foden RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Donald Bittermann, M.D.Diagnostic Radiology Physician1619912409
- Kate Buzzell, PTPhysical Therapist1134129968
- Katherine Campbell, MDFamily Medicine Physician1619618527
- Sarah Daly, ATCAthletic Trainer1912949108
Verify Margaret Libby in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maine board licenses this profession
Search for license CNP151055Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% fewer Medicare Part D claims than the average family nurse practitioner in 2024
1,254 Medicare Part D claims for 263 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 28% of claims. 26 claims were for opioids.
Most prescribed
- Ozempic59 claims
- Atorvastatin Calcium53 claims
- Jardiance50 claims
- Metformin Hcl Er42 claims
- Prednisone42 claims
- Mounjaro37 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.
Bills Medicare through 2 group practices
- Intermed PASouth Portland, ME
- Riverview Physical Therapy Limited PartnershipYarmouth, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Libby among 1,274 family nurse practitioner records in Maine
Margaret Libby, NP-C 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 2015, is newer than 43% of them.
- NPI issued2015 · 43% of these records are older, 52% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2015 · median 2018 among the 811 with a school on file
- Record last updated2026 · 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
- Pamela Argereow, FNPSouth Portland, ME 041061013087758
- Lisa Bulthuis, NPSouth Portland, ME 041061689636607
- Mary Delois, RN,MSN,F.N.P.-CSouth Portland, ME 041061003963232
- Sarah Fuhrman, FNPSouth Portland, ME 041061053380741
- Jaime Hare, FNP-CSouth Portland, ME 041061679543219
- Duncan Hopkins, MS, FNP-CSouth Portland, ME 041061033233754
- Lynn Howard, APRN CNPSouth Portland, ME 041061184624397
- Melissa Libby, FNPSouth Portland, ME 041061033170709
Common questions
What is Margaret Libby, NP-C's NPI number?
Margaret Libby, NP-C's National Provider Identifier (NPI) is 1619359007, issued on Jun 23, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Libby, NP-C located?
The NPPES record lists a practice address at 100 Foden RD, South Portland, ME, 04106. Phone: (207) 874-1489. Providers update this record themselves, so call before visiting.
How can I verify Margaret Libby, NP-C's license?
NPPES lists Maine license number CNP151055, as entered by the provider. Search the Maine board that licenses this profession; the NPPES record confirms identity only.
How much does Margaret Libby, NP-C prescribe under Medicare Part D?
In 2024, Margaret Libby, NP-C had 1,254 Medicare Part D claims for 263 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.