Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Alex Ruttenberg, MSW, LSW
Social Worker in Princeton, NJ · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1992732077
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Registry record
Entity type Individual (Type 1)
Name Alex Ruttenberg
Credential MSW, LSW
Sex Male
Practice address 707 Alexander Rd, Suite 102, Princeton, NJ, 08540
Phone (609) 987-8100
Fax (609) 987-0574
Enumeration date Jun 26, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
104100000X Social Worker Behavioral Health & Social Service Providers · License 44SL05334600 (NJ) Primary
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
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Alex Ruttenberg?
Alex Ruttenberg is registered in NPPES with the primary taxonomy of Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.