Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Steven Guichelaar, NP

Psychiatric/Mental Health Nurse Practitioner in North Haven, CT · enumerated 2014.

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

National Provider Identifier

1427476811

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Steven Guichelaar

Credential NP

Sex Male

Practice address 556 Washington Ave Ste 201, North Haven, CT, 06473

Phone (203) 779-5799

Fax (203) 599-0260

Enumeration date Apr 2, 2014

Last updated in NPPES Oct 9, 2025

Taxonomy & licenses

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 71004912A (IN) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License GAA-NP002139 (GA) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 0024189657 (VA) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 4017019 (KY) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License RN10004996 (MA) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License CNP241373 (ME) Secondary

163W00000X Registered Nurse Nursing Service Providers · License 28196369A (IN) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 093521-23 (NH) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License APRN.CNP.0035978 (OH) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 12.013275 (CT) Primary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License APRN11032714 (FL) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License APRN04079 (RI) Secondary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP credential

Other identifiers

Identifier	Type	State	Issuer
201228430	Medicaid	IN	-
000000876664	Other	IN	ANTHEM
000000876487	Other	IN	ANTHEM

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 1427476811 active?

Yes, as of the latest NPPES snapshot, NPI 1427476811 is active (record last updated 2025-10-09).

How do I verify Steven Guichelaar's NPI record?

Cross-check NPI 1427476811 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Aiza Nimeh Psychiatric/Mental Health Nurse Practitioner · North Haven, CT NPI 1952724080

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-10-09.