Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Margaret Hartner Mass, AU.D.
Audiologist in Waterbury, CT · enumerated 2008.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1669622007
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Margaret Hartner Mass
Credential AU.D.
Sex Female
Practice address 21 W Main St Fl 3, Waterbury, CT, 06702
Phone (203) 574-3777
Enumeration date Sep 23, 2008
Last updated in NPPES Feb 15, 2021
Taxonomy & licenses
237600000X Audiologist-Hearing Aid Fitter Speech, Language and Hearing Service Providers · License 659 (CT) Secondary
231H00000X Audiologist Speech, Language and Hearing Service Providers · License 002254-1 (NY) Secondary
AUD · Doctor of Audiology: A licensed audiologist diagnosing and treating hearing and balance disorders.
About the AUD credential
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
Is NPI 1669622007 active?
Yes, as of the latest NPPES snapshot, NPI 1669622007 is active (record last updated 2021-02-15).
How do I verify Margaret Mass's NPI record?
Cross-check NPI 1669622007 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-15.