MARGARET LIBBY NP-C
NPI 1619359007
Nurse Practitioner - Family in South Portland, ME
About Margaret Libby Np-c NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET LIBBY NP-C (NPI 1619359007) is an individual family provider in South Portland, Maine, licensed in Maine (CNP151055) and active in the NPI registry since June 2015. She is enrolled in Medicare PECOS and is a graduate of Other (2015).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
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
Margaret Libby Np-c 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 Reassignment
Medicare enrollment records show Margaret Libby reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
South Portland, ME 04106
- Reassigned Medicare billing, Maine enrollment
- 200 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.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 04106 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
SOUTH PORTLAND, ME 04106
SOUTH PORTLAND, ME 04106
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 Margaret Libby's NPI number?
The NPI number for Margaret Libby is 1619359007. It was assigned to this individual provider in the NPPES registry on June 23, 2015. The provider is also known as Margaret Defanti.
Where is Margaret Libby located?
Margaret Libby practices at 100 Foden Rd Suite 203, South Portland, ME 04106. The listed phone number is (207) 874-1489.
What is Margaret Libby's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Margaret Libby enrolled in Medicare?
Yes. Margaret Libby 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 organization bills Medicare for Margaret Libby's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Libby reassigns Medicare benefits to Intermed, PA (South Portland, ME). The 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 Margaret Libby's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Margaret Libby was last updated on March 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 months 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.
# Margaret Libby, NP-C · NPI 1619359007
Family physician in South Portland, Maine. Individual provider, active in the CMS NPPES registry since June 23, 2015.
## Identity
- **NPI:** 1619359007 (Entity type: Individual)
- **Enumerated:** June 23, 2015
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** CNP151055 (Maine)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 FODEN RD, SUITE 203, South Portland, ME 04106-2327
- **Phone:** (207) 874-1489 · **Fax:** (207) 523-8590
## 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:** Intermed, PA (NPI 1467422733, South Portland, ME), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** March 6, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1619359007) · Data from the CMS NPPES public registry.