Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Nathan Rhys Gwilliam, MD

Individual provider Psychiatry Physician · NPI 1366882409

Dr. Nathan Rhys Gwilliam, MD is a Psychiatry in New Haven, Connecticut. Graduated from Baylor College of Medicine in 2012, 14 years ago. Practices with Middlesex Hospital, a 229-clinician group and accepts Medicare assignment. Licensed in Connecticut.

Years since qualifying
14
Trained at
Baylor College of Medicine
Licensed in
CT
In the registry since
2013
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

389 Whitney Ave Whitney Ofc Suites #2
New Haven, CT 06511
Phone: (203) 293-6258
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 71782 (CT)

Record details

NPI number1366882409
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 3, 2013
Last updated in NPPESApril 6, 2026
Certification dateApril 6, 2026

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolBAYLOR COLLEGE OF MEDICINE
Graduated 2012 (14 years in practice)
Group practice Middlesex Hospital — 229 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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