Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Heather Sienkowski, RDH
Dental Hygienist in Great Falls, MT · enumerated 2021.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1538832282
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Heather Sienkowski
Credential RDH
Sex Female
Practice address 202 2nd Ave S Ste 203, Great Falls, MT, 59405
Phone (406) 791-9267
Fax (406) 791-9277
Enumeration date Jul 28, 2021
Last updated in NPPES Oct 1, 2025
Taxonomy & licenses
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.
Frequently asked questions
What is the NPI number for Heather Sienkowski?
The National Provider Identifier (NPI) for Heather Sienkowski is 1538832282, a Type 1 (individual) record in the CMS NPPES registry.
Where does Heather Sienkowski practice?
The practice location on file with NPPES is in Great Falls, MT. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Chris Blixrud Dentist · Great Falls, MT NPI 1174604110 Kenneth Grebliunas General Practice Dentistry · Great Falls, MT NPI 1689750028 Tessa Simpson Dental Hygienist · Great Falls, MT NPI 1316405756 Deanna Goss Dental Hygienist · Great Falls, MT NPI 1336876549 Reegan Debruycker General Practice Dentistry · Great Falls, MT NPI 1538919311 Sarapoornima Sendhur General Practice Dentistry · Great Falls, MT NPI 1497572416
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-10-01.