NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Ms. Diana L Dumais

Case Manager/Care Coordinator in Portsmouth, NH · enumerated 2008.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1780857714

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Ms. Diana L Dumais
Sex Female
Practice address Portsmouth, NH, 03801
Phone (603) 431-6703
Fax (603) 430-3753
Enumeration date Apr 10, 2008
Last updated in NPPES Apr 10, 2008

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

171M00000X Case Manager/Care Coordinator Other Service Providers Primary

Other identifiers

Identifier Type State Issuer
7706655Y0NH01 Other NH BHN
99003227 Medicaid NH -

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Diana Dumais?
The National Provider Identifier (NPI) for Diana Dumais is 1780857714, a Type 1 (individual) record in the CMS NPPES registry.
Where does Diana Dumais practice?
The practice location on file with NPPES is in Portsmouth, NH. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-04-10.