Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
James D. Duffy, MD
Psychiatry Physician in Mystic, CT · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1831118736
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Registry record
Entity type Individual (Type 1)
Name James D. Duffy
Credential MD
Sex Male
Practice address 100 Perkins Farm Drive, Suite 102, Mystic, CT, 06355
Phone (860) 870-6385
Fax (860) 245-0000
Enumeration date Jul 19, 2006
Last updated in NPPES Jul 19, 2022
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
How do I verify James Duffy's NPI record?
Cross-check NPI 1831118736 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1831118736 active?
Yes, as of the latest NPPES snapshot, NPI 1831118736 is active (record last updated 2022-07-19).
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-19.