Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Constantine Velmahos, BS
Urology Physician in Boston, MA · enumerated 2024.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1730945569
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Registry record
Entity type Individual (Type 1)
Name Constantine Velmahos
Credential BS
Sex Male
Practice address 55 Fruit St, Boston, MA, 02114
Phone (617) 726-2000
Enumeration date Feb 28, 2024
Last updated in NPPES Feb 28, 2024
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
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 Constantine Velmahos?
Constantine Velmahos is registered in NPPES with the primary taxonomy of Urology Physician. 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 2024-02-28.