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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Steven Altman, D.M.D

General Practice Dentistry in Greenwich, CT · enumerated 2013 · practices at Greenwich Dental Group, LLC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1518206606

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Registry record

Entity type Individual (Type 1)
Name Dr. Steven Altman
Credential D.M.D
Sex Male
Practice address Greenwich, CT, 06830
Phone (203) 869-3984
Enumeration date Feb 8, 2013
Last updated in NPPES Sep 5, 2019

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 10972 (CT) Primary
DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD 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.

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Frequently asked questions

What is the NPI number for Steven Altman?
The National Provider Identifier (NPI) for Steven Altman is 1518206606, a Type 1 (individual) record in the CMS NPPES registry.
Where does Steven Altman practice?
The practice location on file with NPPES is in Greenwich, CT. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-09-05.