Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark Greenbaum, MD
Specialist in Bronx, NY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1003884180
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Registry record
Entity type Individual (Type 1)
Name Mark Greenbaum
Credential MD
Sex Male
Practice address 3010 Grand Concourse, Bronx, NY, 10458
Phone (203) 856-8550
Fax (203) 557-3148
Enumeration date Mar 14, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 05853H | Other | NY | GHI MEDICARE |
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 Mark Greenbaum?
The National Provider Identifier (NPI) for Mark Greenbaum is 1003884180, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mark Greenbaum practice?
The practice location on file with NPPES is in Bronx, NY. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.