Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Douglas Kanter Marks, M.D.

Hematology & Oncology Physician in New York, NY · enumerated 2012.

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

National Provider Identifier

1083980189

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Registry record

Entity type Individual (Type 1)

Name Douglas Kanter Marks

Credential M.D.

Sex Male

Practice address 177 Fort Washington Avenue, 6mhb-Room 635, New York, NY, 10032

Phone (212) 305-7115

Enumeration date Mar 22, 2012

Last updated in NPPES Feb 23, 2021

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 274527 (NY) 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 Douglas Marks practice?

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

What is the NPI number for Douglas Marks?

The National Provider Identifier (NPI) for Douglas Marks is 1083980189, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-23.