Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

John Mroz Psychiatric Nurse Practitioner Pllc

Psychiatric/Mental Health Nurse Practitioner in East Islip, NY · enumerated 2024 · authorized official John Mroz, Pmhnp.

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

National Provider Identifier

1578334660

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Registry record

Entity type Organization (Type 2)

Legal business name John Mroz Psychiatric Nurse Practitioner Pllc

Practice address 107 W Main St, East Islip, NY, 11730

Phone (631) 666-1615

Enumeration date Jan 9, 2024

Last updated in NPPES Jan 9, 2024

Taxonomy & classification

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers Primary

Authorized official

Name John Mroz

Title Pmhnp

Phone (631) 666-1615

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 John Mroz Psychiatric Nurse Practitioner Pllc?

The NPI for John Mroz Psychiatric Nurse Practitioner Pllc is 1578334660, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for John Mroz Psychiatric Nurse Practitioner Pllc?

NPPES lists John Mroz (Pmhnp) as the authorized official for this organization.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-01-09.