NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Henri Raymond Masse, GNP

Gerontology Nurse Practitioner in Santa Rosa, CA · enumerated 2006.

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

National Provider Identifier

1235209636

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Mr. Henri Raymond Masse
Credential GNP
Sex Male
Practice address 3554 Round Barn Blvd Ste 108, Santa Rosa, CA, 95403
Phone (707) 571-3872
Fax (707) 571-3885
Enumeration date Nov 9, 2006
Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

363LG0600X Gerontology Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 5023 (CA) Primary

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 Henri Masse?
The National Provider Identifier (NPI) for Henri Masse is 1235209636, a Type 1 (individual) record in the CMS NPPES registry.
Where does Henri Masse practice?
The practice location on file with NPPES is in Santa Rosa, CA. 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 2007-07-08.