Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark Joseph Mayhew, LCSW
Social Worker in Westfield, IN · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1033294095
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Registry record
Entity type Individual (Type 1)
Name Mark Joseph Mayhew
Credential LCSW
Sex Male
Practice address 1127 Hamilton Way, Westfield, IN, 46074
Phone (317) 432-3183
Enumeration date Oct 26, 2006
Last updated in NPPES Jun 28, 2022
Taxonomy & licenses
LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy.
About the LCSW 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
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 Mark Mayhew?
Mark Mayhew 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.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-06-28.