Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ann M Callahan, MD
Psychiatry Physician in Darien, CT · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1144343328
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Registry record
Entity type Individual (Type 1)
Name Ann M Callahan
Credential MD
Sex Female
Practice address 10 Corbin Dr, Suite 4, Darien, CT, 06820
Phone (203) 655-0002
Fax (203) 655-0023
Enumeration date Apr 10, 2007
Last updated in NPPES Feb 18, 2010
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 Ann Callahan's NPI record?
Cross-check NPI 1144343328 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1144343328 active?
Yes, as of the latest NPPES snapshot, NPI 1144343328 is active (record last updated 2010-02-18).
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-02-18.