Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Daniel Marder, M.D.

Specialist in Washington, DC · enumerated 2006.

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

National Provider Identifier

1780635615

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Registry record

Entity type Individual (Type 1)

Name Daniel Marder

Credential M.D.

Sex Male

Practice address 2141 K St Nw, Ste 900, Washington, DC, 20037

Phone (202) 223-9722

Fax (703) 280-5098

Enumeration date May 15, 2006

Last updated in NPPES Jun 23, 2009

Taxonomy & licenses

174400000X Specialist Other Service Providers · License MD21069 (DC) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Daniel Marder practice?

The practice location on file with NPPES is in Washington, DC. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Daniel Marder?

The National Provider Identifier (NPI) for Daniel Marder is 1780635615, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-06-23.