Marissa Elizabeth Souther, MSN, APRN, FNP-C
NPI 1164986758ActiveIndividual· Nurse Practitioner, Family· Exeter, NH
Nurse Practitioner, Family (MSN, APRN, FNP-C) with Core Physicians LLC, practicing in Exeter, New Hampshire. Their prescriptions cost Medicare Part D more than their services did: $249,933 for 1,563 claims, against $830.86 paid for services in 2024. Lists Elliot Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1164986758 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MSN, APRN, FNP-C |
| Sole proprietor | No |
| NPI issued | Jan 28, 2019 |
| Last updated in NPPES | Jul 8, 2025 |
| Certified by provider | Jul 8, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Family Primary | 363LF0000X | 114306-23 | NH |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nurse Practitioner (MA); Practitioner - Nurse Practitioner (NH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 17 |
|---|---|
| Services billed | 36 across 9 procedure codes |
| Paid by Medicare | $830.86 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,563 · 3,184 30-day fills |
|---|---|
| Patients | 159 |
| Total drug cost | $249,933 |
| Generic share | 79% of claims |
Education and affiliations
| Graduation year | 2018 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- Core Physicians LLCExeter, NH · 289 clinicians
Hospital affiliations
- Elliot HospitalManchester, NH
- Exeter Hospital IncExeter, NH
- Lowell General HospitalLowell, MA
Other facilities
- Northeast Professional Registry of Nurses, Inc.Home health agency · Exeter, NH
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 31 family nurse practitioners in Exeter · All family nurse practitioners in New Hampshire