Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JOHN FREDERICK DAY RN
NPI 1114305497
Registered Nurse - Psychiatric/Mental Health in Greenfield, MA

Q: What is John Day's NPI number?

The NPI number for John Day is 1114305497. It was assigned to this individual provider in the NPPES registry on May 7, 2015.

Q: What is John Day's specialty?

The primary specialty registered for this NPI is Registered Nurse, specializing in Psychiatric/Mental Health, with taxonomy code 163WP0808X.

Q: When was this NPI record last updated?

The NPPES record for John Day was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since May 07, 2015

106 SCHOOL ST, APT 1, GREENFIELD, MA 01301(413) 824-1730 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 04, 2026.

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About John Frederick Day Rn NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN FREDERICK DAY RN (NPI 1114305497) is an individual psychiatric/mental health provider in Greenfield, Massachusetts, licensed in Massachusetts (RN2286593) and active in the NPI registry since May 2015.

NPPES Registry Identity

NPI1114305497

Entity TypeIndividualMale

Primary Taxonomy163WP0808X

Provider Legal NameJOHN FREDERICK DAYCredential: RN

Location Address106 SCHOOL ST, APT 1Greenfield, MA 01301-2485

Mailing Address106 School St, Apt 1Greenfield, MA 01301-2485 · (413) 824-1730

Phone(413) 824-1730

Sole ProprietorYes

Enumeration DateMay 7, 2015

Last NPPES UpdateSeptember 29, 2026

✔ NPI 1114305497 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRegistered Nurse · Psychiatric/Mental HealthNursing Service Providers

Taxonomy Code163WP0808X

License✔ Licensed in MA · RN2286593

106 SCHOOL ST, Greenfield, MA 01301

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Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Day's NPI number?

The NPI number for John Day is 1114305497. It was assigned to this individual provider in the NPPES registry on May 7, 2015.

Where is John Day located?

John Day practices at 106 School St Apt 1, Greenfield, MA 01301. The listed phone number is (413) 824-1730.

What is John Day's specialty?

The primary specialty registered for this NPI is Registered Nurse, specializing in Psychiatric/Mental Health, with taxonomy code 163WP0808X.

When was this NPI record last updated?

The NPPES record for John Day was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.