Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mrs. Marissa Elizabeth Souther, MSN, APRN, FNP-C

Individual provider Family Nurse Practitioner · NPI 1164986758

Mrs. Marissa Elizabeth Souther, MSN, APRN, FNP-C is a Nurse Practitioner in Exeter, New Hampshire. Qualified in 2018, 8 years ago. Practices with Core Physicians LLC, a 292-clinician group, accepts Medicare assignment and offers telehealth. Licensed in New Hampshire.

Years since qualifying
8
Licensed in
NH
In the registry since
2019
What do these letters mean?
MSN — Master of Science in Nursing
A graduate nursing degree, usually held alongside an advanced practice licence.
APRN — Advanced Practice Registered Nurse
The umbrella licence covering nurse practitioners, midwives, anaesthetists and clinical nurse specialists.
FNP-C — Family Nurse Practitioner, Certified
A family nurse practitioner certified by the AANP.

See every abbreviation used in this directory →

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Practice location Address checks out

21 Hampton Rd Bldg 3
Exeter, NH 03833-4854
Phone: (603) 775-0000
Fax: (603) 775-0247
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence 114306-23 (NH)

Record details

NPI number1164986758
Entity typeIndividual (Type 1)
GenderFemale
Credentials MSN , APRN , FNP-C
Sole proprietorNo
NPI enumeratedJanuary 28, 2019
Last updated in NPPESJuly 8, 2025
Certification dateJuly 8, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2018 (8 years in practice)
Group practice Core Physicians Llc — 292 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients17
Services billed 36 a service is one billed item, such as a visit, a test or a procedure
Average patient age64

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Core Physicians LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 292 clinicians in the practice; 12 are shown here.

Other providers in Exeter