Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. Guillermo Calleja, L.M.H.C.
Counselor in Great Neck, NY · enumerated 2017.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1154835502
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Registry record
Entity type Individual (Type 1)
Name Mr. Guillermo Calleja
Credential L.M.H.C.
Sex Male
Practice address 11 Grace Ave Ste 204, Great Neck, NY, 11021
Phone (917) 680-3882
Enumeration date Nov 21, 2017
Last updated in NPPES Nov 21, 2017
Taxonomy & licenses
101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 003916 (NY) Secondary
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 Guillermo Calleja's NPI record?
Cross-check NPI 1154835502 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1154835502 active?
Yes, as of the latest NPPES snapshot, NPI 1154835502 is active (record last updated 2017-11-21).
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-11-21.