Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Rex L Mahnensmith, MD

Individual provider Nephrology Physician · NPI 1760466528

Rex L Mahnensmith, MD is an Internal Medicine in Waterbury, Connecticut. Graduated from Yale University School of Medicine in 1977, 49 years ago. Practices with CT Medical Group Inc, a 36-clinician group and accepts Medicare assignment. Licensed in Connecticut.

Years since qualifying
49
Trained at
Yale University School of Medicine
Licensed in
CT
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

80 Phoenix Ave
Waterbury, CT 06702-1418
Phone: (203) 756-8021
Fax: (203) 596-9038
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 021731 (CT)
Nephrology Physician Taxonomy 207RN0300X · Licence 021731 (CT)

Record details

NPI number1760466528
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 5, 2005
Last updated in NPPESOctober 22, 2015
Mailing address80 Phoenix Ave, Waterbury, CT 06702-1418

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolYALE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1977 (49 years in practice)
Group practice Ct Medical Group Inc. — 36 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Waterbury