Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gregory C Blackwell
Adult Companion in Washington, DC · enumerated 2020.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1518598721
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Registry record
Entity type Individual (Type 1)
Name Gregory C Blackwell
Sex Male
Practice address 2551 17th St Nw Apt 312, Washington, DC, 20009
Phone (202) 765-8287
Enumeration date Jan 28, 2020
Last updated in NPPES Jan 28, 2020
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 NPI 1518598721 active?
Yes, as of the latest NPPES snapshot, NPI 1518598721 is active (record last updated 2020-01-28).
How do I verify Gregory Blackwell's NPI record?
Cross-check NPI 1518598721 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-01-28.