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

Ellen Mellow, MD

Internal Medicine Physician in New York, NY · enumerated 2005.

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

National Provider Identifier

1366444259

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Registry record

Entity type Individual (Type 1)

Name Ellen Mellow

Credential MD

Sex Female

Practice address New York, NY, 10022

Phone (212) 838-4114

Fax (212) 838-4145

Enumeration date Aug 11, 2005

Last updated in NPPES Nov 10, 2017

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 146454 (NY) Primary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 146454 (NY) Secondary

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
01166449	Medicaid	NY	-

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

Is NPI 1366444259 active?

Yes, as of the latest NPPES snapshot, NPI 1366444259 is active (record last updated 2017-11-10).

How do I verify Ellen Mellow's NPI record?

Cross-check NPI 1366444259 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-11-10.