Margaret Hartner Mass, AU.D.
Audiologist · Waterbury, CT
Margaret Hartner Mass, AU.D. is an audiologist with a practice address in Waterbury, Connecticut, and NPI 1669622007, issued on Sep 23, 2008. Check the license (Connecticut 659, as entered in NPPES) with the Connecticut board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Margaret Hartner Mass
- Credential
- AU.D.
- Primary taxonomy
- Audiologist 231H00000X
- License numbers
- 659 CT
002254-1 NY
Self-reported in NPPES; status is on the state search - Practice location
- 21 W Main St FL 3, Waterbury, CT 06702
- Phone
- (203) 574-3777
- Enumerated
- Sep 23, 2008
- Record last updated
- Feb 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20090915000469); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest audiologist records → All 275 in Connecticut → Look up another NPI →
Also registered at 21 W Main St FL 3
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Katarina Falero, AUDAudiologist1871285346
- Natalie Silvia, AU.D.Audiologist1619586641
Verify Margaret Hartner Mass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Connecticut board licenses this profession
Search for license 659Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Ent And Allergy Associates LLPPurchase, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Hartner Mass among 275 audiologist records in Connecticut
Margaret Hartner Mass, AU.D. is one of 275 audiologist records with a practice address in Connecticut. 40% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 34% of them.
- NPI issued2008 · 34% of these records are older, 54% newer
- In a Medicare fileYes · 40% of these records are
- In the CMS Doctors and Clinicians fileYes · 41% of these records are
- Graduated2007 · median 2014 among the 114 with a school on file
- Record last updated2021 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 231H00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Audiologist providers in Connecticut
There are 275 audiologist records in Connecticut.
All 275 in Connecticut → Every provider in Waterbury → Audiologist nationwide →
The 8 audiologist records with the nearest ZIP codes
- Katarina Falero, AUDWaterbury, CT 067021871285346
- Melynda Jose, M.A.Waterbury, CT 067021235220195
- Zelda Shleifer, AU.D., CCC-AWaterbury, CT 067021265725584
- Natalie Silvia, AU.D.Waterbury, CT 067021619586641
- Lori Cooney, AUD., CCC-AWaterbury, CT 067051952341240
- Lisa Andrighetti, MSWaterbury, CT 067081164694725
- Annette Burton, AU.D.Waterbury, CT 067081437259546
- Allison Golino, AU.D., CCC-A, FAAAWaterbury, CT 067081609227487
Common questions
What is Margaret Hartner Mass, AU.D.'s NPI number?
Margaret Hartner Mass, AU.D.'s National Provider Identifier (NPI) is 1669622007, issued on Sep 23, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Hartner Mass, AU.D. located?
The NPPES record lists a practice address at 21 W Main St FL 3, Waterbury, CT, 06702. Phone: (203) 574-3777. Providers update this record themselves, so call before visiting.
How can I verify Margaret Hartner Mass, AU.D.'s license?
NPPES lists Connecticut license number 659, as entered by the provider. Search the Connecticut board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.