GLENDA GRACE CALLENDER MD
NPI 1952599441
Surgery - Surgical Oncology in Waterbury, CT
About Glenda Grace Callender Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GLENDA GRACE CALLENDER MD (NPI 1952599441) is an individual surgical oncology provider in Waterbury, Connecticut, licensed in Connecticut (51630) and active in the NPI registry since October 2007. She is enrolled in Medicare PECOS, maintains a secondary practice location in New Haven, and is a graduate of Harvard Medical School (2000).
NPPES Registry Identity
Specialties & Licenses
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
Glenda Grace Callender Md 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 Glenda Callender reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Hamden, CT 06514
- Reassigned Medicare billing, Connecticut enrollment
- 3,728 clinicians in this Medicare group
Hartford, CT 06106
- Reassigned Medicare billing, Connecticut enrollment
- 1,921 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 06706 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
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 Glenda Callender's NPI number?
The NPI number for Glenda Callender is 1952599441. It was assigned to this individual provider in the NPPES registry on October 9, 2007.
Where is Glenda Callender located?
Glenda Callender practices at 133 Scovill St Ste 303, Waterbury, CT 06706. The listed phone number is (203) 709-6871.
What is Glenda Callender's specialty?
The primary specialty registered for this NPI is Surgery, specializing in Surgical Oncology, with taxonomy code 2086X0206X.
Is Glenda Callender enrolled in Medicare?
Yes. Glenda Callender 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 Glenda Callender's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Glenda Callender reassigns Medicare benefits to 2 organizations: Yale University (Hamden, CT) and Hartford Healthcare Medical Group Specialists, PLLC (Hartford, CT). 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 Glenda Callender'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 Glenda Callender was last updated on September 18, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Glenda Grace Callender, MD · NPI 1952599441
Surgical Oncology physician in Waterbury, Connecticut. Individual provider, active in the CMS NPPES registry since October 9, 2007.
## Identity
- **NPI:** 1952599441 (Entity type: Individual)
- **Enumerated:** October 9, 2007
- **Primary specialty:** Surgery - Surgical Oncology · taxonomy 2086X0206X
- **State license:** 51630 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 133 SCOVILL ST STE 303, Waterbury, CT 06706-1127
- **Phone:** (203) 709-6871
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Yale University (NPI 1134391824, Hamden, CT); Hartford Healthcare Medical Group Specialists, PLLC (NPI 1023584216, Hartford, CT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 2000
## Record status
- **NPPES last updated:** September 18, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1952599441) · Data from the CMS NPPES public registry.