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

Cyndi Lu Marengo, RDH

Dental Hygienist in St. Ignatius, MT · enumerated 2010.

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

National Provider Identifier

1700109790

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Registry record

Entity type Individual (Type 1)

Name Cyndi Lu Marengo

Credential RDH

Sex Female

Practice address St. Ignatius, MT, 59864

Phone (406) 745-3525

Fax (406) 745-4235

Enumeration date Mar 5, 2010

Last updated in NPPES Mar 5, 2010

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

Taxonomy & licenses

124Q00000X Dental Hygienist Dental Providers · License 006256 (CT) Primary

124Q00000X Dental Hygienist Dental Providers · License 12417 (MA) Secondary

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

How do I verify Cyndi Marengo's NPI record?

Cross-check NPI 1700109790 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1700109790 active?

Yes, as of the latest NPPES snapshot, NPI 1700109790 is active (record last updated 2010-03-05).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-03-05.