MARGARET HARTNER MASS AU.D.
NPI 1669622007
Audiologist in Waterbury, CT
About Margaret Hartner Mass Au.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET HARTNER MASS AU.D. (NPI 1669622007) is an individual audiologist in Waterbury, Connecticut, licensed in Connecticut (659) and active in the NPI registry since September 2008. She maintains a secondary practice location in Newburgh and is a graduate of Other (2007).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Margaret Hartner Mass Au.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Margaret Mass reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Waterbury, CT 06702
- Reassigned Medicare billing, Connecticut enrollment
- Medicare enrollment name: Connecticut Ear Nose & Throat Sinus & Allergy Specialists PC
- 9 clinicians in this Medicare group
Tarrytown, NY 10591
- Reassigned Medicare billing, New York enrollment
- 312 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06702 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Margaret Mass's NPI number?
The NPI number for Margaret Mass is 1669622007. It was assigned to this individual provider in the NPPES registry on September 23, 2008.
Where is Margaret Mass located?
Margaret Mass practices at 21 W Main St Fl 3, Waterbury, CT 06702. The listed phone number is (203) 574-3777.
What is Margaret Mass's specialty?
The primary specialty registered for this NPI is Audiologist with taxonomy code 231H00000X.
Is Margaret Mass enrolled in Medicare?
Yes. Margaret Mass is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Margaret Mass's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Mass reassigns Medicare benefits to 2 organizations: Connecticut Ear, Nose & Throat, Sinus & Allergy Specialists, P.C. (Waterbury, CT) and Ent And Allergy Associates LLP (Tarrytown, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Margaret Mass's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Margaret Mass was last updated on February 15, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Margaret Hartner Mass, AU.D. · NPI 1669622007
Audiologist provider in Waterbury, Connecticut. Individual provider, active in the CMS NPPES registry since September 23, 2008.
## Identity
- **NPI:** 1669622007 (Entity type: Individual)
- **Enumerated:** September 23, 2008
- **Primary specialty:** Audiologist · taxonomy 231H00000X
- **State license:** 659 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 21 W MAIN ST FL 3, Waterbury, CT 06702-2016
- **Phone:** (203) 574-3777
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Connecticut Ear, Nose & Throat, Sinus & Allergy Specialists, P.C. (NPI 1881635712, Waterbury, CT); Ent And Allergy Associates LLP (NPI 1376598326, Tarrytown, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2007
## Record status
- **NPPES last updated:** February 15, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1669622007) · Data from the CMS NPPES public registry.