Isabella Vertefeuille, MS
Isabella Vertefeuille, MS is a Marriage & Family Therapist in Portsmouth, NH, registered under NPI 1003638453.
Getting there
Here is what surrounds this office in Portsmouth, based on OpenStreetMap data collected Oct 11, 2026. Parking is available about 213 ft away. The nearest transit stop is 839 ft away, served by 195 / 222 New Hampshire Avenue.
Getting here and what is nearby
Parking 141 ft ~1 min
Parking 186 ft ~1 min
Parking 213 ft ~1 min
Transit International Drive 306 ft ~2 min
Transit International Drive / Pinecrest Terrace 610 ft ~3 min
Transit 195 / 222 New Hampshire Avenue 839 ft ~4 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Marriage & Family Therapist covers
A marriage and family therapist is a person with a master's degree in marriage and family therapy, or a master's or doctoral degree in a related mental health field with substantially equivalent coursework in marriage and family therapy, who receives supervised clinical experience, or a person who meets the state requirements to practice as a marriage and family therapist. A marriage and family therapist treats mental and emotional disorders within the context of marriage and family systems. A marriage and family therapist provides mental health and counseling services to individuals, couples, families, and groups. NUCC Health Care Provider Taxonomy, code 106H00000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003638453 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Oct 28, 2024 |
| Last updated | Oct 28, 2024 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Credential | MS |
| Practice address |
200 INTERNATIONAL DR STE 157 Portsmouth, NH 03801 (603) 957-1877 |
| Mailing address |
11 MAPLE ST Exeter, NH 03833 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 6 | 3 | 8 | 4 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 3 | 3 | 7 | 4 | 1 |
Sum = 47 · next multiple of 10 = 50 · check digit = 3 · actual last digit = 3
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.