Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Margaret Keane Miller, NP

Psychiatric/Mental Health Nurse Practitioner in Greenwich, CT · enumerated 2019 · practices at Avenue Psychiatry.

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

National Provider Identifier

1477113561

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Registry record

Entity type Individual (Type 1)

Name Ms. Margaret Keane Miller

Credential NP

Sex Female

Practice address 151 Greenwich Ave Apt 306, Greenwich, CT, 06830

Phone (888) 334-2500

Fax (475) 303-3055

Enumeration date Jun 19, 2019

Last updated in NPPES Apr 25, 2025

Taxonomy & licenses

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 402667 (NY) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 12318 (CT) Primary

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

Where does Margaret Miller practice?

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

What is the NPI number for Margaret Miller?

The National Provider Identifier (NPI) for Margaret Miller is 1477113561, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Avenue Psychiatry Adult Mental Health Clinic/Center · Greenwich, CT NPI 1952105306

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-04-25.