Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Matthew G Killian, PMHNP

Psychiatric/Mental Health Nurse Practitioner in Melville, NY · enumerated 2021.

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

National Provider Identifier

1275204778

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Registry record

Entity type Individual (Type 1)

Name Mr. Matthew G Killian

Credential PMHNP

Sex Male

Practice address 200 Broadhollow Rd Ste 119, Melville, NY, 11747

Phone (516) 588-7512

Enumeration date Sep 23, 2021

Last updated in NPPES Sep 23, 2021

Taxonomy & licenses

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 403593 (NY) Primary

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.

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Frequently asked questions

How do I verify Matthew Killian's NPI record?

Cross-check NPI 1275204778 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1275204778 active?

Yes, as of the latest NPPES snapshot, NPI 1275204778 is active (record last updated 2021-09-23).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-09-23.