Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Katherine E Elwyn, MD

Specialist in Mount Kisco, NY · enumerated 2006.

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

National Provider Identifier

1326118084

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Registry record

Entity type Individual (Type 1)

Name Dr. Katherine E Elwyn

Credential MD

Sex Female

Practice address 344 E Main St, Suite 403, Mount Kisco, NY, 10549

Phone (914) 244-9058

Fax (914) 244-9045

Enumeration date Nov 9, 2006

Last updated in NPPES Jul 9, 2007

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 133233-1 (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

What is the NPI number for Katherine Elwyn?

The National Provider Identifier (NPI) for Katherine Elwyn is 1326118084, a Type 1 (individual) record in the CMS NPPES registry.

Where does Katherine Elwyn practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.