Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Holly Mason, M.D.,PH.D.
Dermatology Physician in Salem, MA · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1497950182
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Registry record
Entity type Individual (Type 1)
Name Holly Mason
Credential M.D.,PH.D.
Sex Female
Practice address 5 Paradise Rd, Salem, MA, 01970
Phone (978) 691-5690
Fax (978) 691-5693
Enumeration date Jun 20, 2007
Last updated in NPPES Dec 6, 2017
Taxonomy & licenses
390200000X Student in an Organized Health Care Education/Training Program Student, Health Care · License MT189227 (PA) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD 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
What specialty is Holly Mason?
Holly Mason is registered in NPPES with the primary taxonomy of Dermatology Physician. 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 2017-12-06.