Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark K Majewski, LSW, MSW
Social Worker in Rockaway, NJ · enumerated 2024.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1225856818
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Registry record
Entity type Individual (Type 1)
Name Mark K Majewski
Credential LSW, MSW
Sex Male
Practice address 20 Vanderhoof Ave Ste 2, Rockaway, NJ, 07866
Phone (973) 586-5243
Enumeration date Oct 1, 2024
Last updated in NPPES Oct 1, 2024
Taxonomy & licenses
104100000X Social Worker Behavioral Health & Social Service Providers · License 44SL06783700 (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
What specialty is Mark Majewski?
Mark Majewski 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.
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.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-10-01.