Nathan Rhys Gwilliam, MD
Psychiatry Physician · New Haven, CT
Nathan Rhys Gwilliam, MD is a psychiatry physician with a practice address in New Haven, Connecticut, and NPI 1366882409, issued on Jul 3, 2013. Check the license (Connecticut 71782, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Nathan Rhys Gwilliam
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 71782 CT
Self-reported in NPPES; status is on the state search - Practice location
- 389 Whitney Ave, New Haven, CT 06511
- Phone
- (203) 293-6258
- Enumerated
- Jul 3, 2013
- Record last updated
- Apr 6, 2026
- Medicare enrollment
- Enrolled (PECOS I20240522003078); accepts Medicare assignment
- Medical or professional school
- Baylor College Of Medicine, 2012
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 1,174 in Connecticut → Look up another NPI →
Also registered at 389 Whitney Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mary Doyle-Fritz, L.C.S.WClinical Social Worker1790990018
- Anne Dutton, M.S.W.Clinical Social Worker1366807182
- Jesse Geller, PHDClinical Psychologist1376852814
- Ruth Geller, LCSWClinical Social Worker1497943450
- Derrick Gordon, PH.D.Clinical Psychologist1730690835
- Deborah Kraemer, PH.D.Clinical Psychologist1659903003
Verify Nathan Rhys Gwilliam in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 71782Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
64% fewer Medicare Part D claims than the average psychiatry physician in 2024
356 Medicare Part D claims for 73 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Trazodone Hcl28 claims
- Duloxetine Hcl21 claims
- Lamotrigine20 claims
- Lorazepam20 claims
- Clonazepam18 claims
- Fluoxetine Hcl18 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
One hospital affiliation
- Middlesex HospitalMiddletown, CT · Acute Care Hospitals3 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Nathan Rhys Gwilliam among 1,174 psychiatry physician records in Connecticut
Nathan Rhys Gwilliam, MD is one of 1,174 psychiatry physician records with a practice address in Connecticut. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 71% of them.
- NPI issued2013 · 71% of these records are older, 26% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated2012 · median 2003 among the 503 with a school on file
- Record last updated2026 · 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 2084P0800X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
285 psychiatry physician records list a practice address in New Haven
They are 285 of the 9,793 NPPES records with a practice address in New Haven, and 1,174 psychiatry physician records in Connecticut.
All 1,174 in Connecticut → Every provider in New Haven → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Erica Ahlert, MDNew Haven, CT 065111750479481
- Hilary Blumberg, M.D.New Haven, CT 065111679511299
- Michael Groner, M. D.New Haven, CT 065111316973134
- Jeffry Klugman, MDNew Haven, CT 065111225023203
- Helen Lankenau, M.D.New Haven, CT 065111215016639
- Gale Levin, M.D.New Haven, CT 065111679508469
- Keith Pearlman, MDNew Haven, CT 065111588622088
- Stanley Possick, MDNew Haven, CT 065111366478315
Common questions
What is Nathan Rhys Gwilliam, MD's NPI number?
Nathan Rhys Gwilliam, MD's National Provider Identifier (NPI) is 1366882409, issued on Jul 3, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Nathan Rhys Gwilliam, MD located?
The NPPES record lists a practice address at 389 Whitney Ave, New Haven, CT, 06511. Phone: (203) 293-6258. Providers update this record themselves, so call before visiting.
How can I verify Nathan Rhys Gwilliam, MD's license?
NPPES lists Connecticut license number 71782, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathan Rhys Gwilliam, MD prescribe under Medicare Part D?
In 2024, Nathan Rhys Gwilliam, MD had 356 Medicare Part D claims for 73 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions 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.