Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mary Lou Brennan, MS
Specialist in Sayville, NY · enumerated 2012.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1215290903
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Registry record
Entity type Individual (Type 1)
Name Mary Lou Brennan
Credential MS
Sex Female
Practice address 335 Johnson Ave, Sayville, NY, 11782
Phone (631) 589-8060
Enumeration date Jun 19, 2012
Last updated in NPPES Jun 19, 2012
Taxonomy & licenses
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
Where does Mary Lou Brennan practice?
The practice location on file with NPPES is in Sayville, NY. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mary Lou Brennan?
The National Provider Identifier (NPI) for Mary Lou Brennan is 1215290903, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-06-19.