Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Douglas L Greenspan, DDS
Dentist in Gaithersburg, MD · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1790797306
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Registry record
Entity type Individual (Type 1)
Name Douglas L Greenspan
Credential DDS
Sex Male
Practice address 213 Frederick Avenue, Suite 1, Gaithersburg, MD, 20877
Phone (301) 948-5858
Fax (301) 926-8566
Enumeration date Aug 12, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees.
About the DDS 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 is the NPI number for Douglas Greenspan?
The National Provider Identifier (NPI) for Douglas Greenspan is 1790797306, a Type 1 (individual) record in the CMS NPPES registry.
Where does Douglas Greenspan practice?
The practice location on file with NPPES is in Gaithersburg, MD. Providers can have multiple locations; NPPES lists the primary practice address.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.