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

CARL LEONARD FESSENDEN CADC-II
NPI 1689220477
Counselor - Addiction (Substance Use Disorder) in Fairfield, CA

Q: What is Carl Fessenden's NPI number?

The NPI number for Carl Fessenden is 1689220477. It was assigned to this individual provider in the NPPES registry on August 16, 2019.

Q: What is Carl Fessenden's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

Q: When was this NPI record last updated?

The NPPES record for Carl Fessenden 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 8 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 August 16, 2019

1974 WINCHESTER PL, FAIRFIELD, CA 94533(707) 290-1166 Get Directions Write a Review

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

Record update history: Sep 29, 2026, Aug 16, 2019 (2 updates tracked since 2019).

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About Carl Leonard Fessenden Cadc-ii NPPES

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

CARL LEONARD FESSENDEN CADC-II (NPI 1689220477) is an individual addiction (substance use disorder) provider in Fairfield, California and active in the NPI registry since August 2019.

NPPES Registry Identity

NPI1689220477

Entity TypeIndividualMale

Primary Taxonomy101YA0400X

Provider Legal NameCARL LEONARD FESSENDENCredential: CADC-II

Location Address1974 WINCHESTER PLFairfield, CA 94533-3618

Mailing Address1974 Winchester PlFairfield, CA 94533-3618 · (707) 290-1166

Phone(707) 290-1166

Sole ProprietorYes

Enumeration DateAugust 16, 2019

Last NPPES UpdateSeptember 29, 20262 updates tracked since enumeration

NPPES CertifiedJune 27, 2023

✔ NPI 1689220477 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyCounselor · Addiction (Substance Use Disorder)Behavioral Health & Social Service Providers

Taxonomy Code101YA0400X

Also ListedCommunity Health WorkerTaxonomy 172V00000X

1974 WINCHESTER PL, Fairfield, CA 94533

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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 Carl Fessenden's NPI number?

The NPI number for Carl Fessenden is 1689220477. It was assigned to this individual provider in the NPPES registry on August 16, 2019.

Where is Carl Fessenden located?

Carl Fessenden practices at 1974 Winchester Pl, Fairfield, CA 94533. The listed phone number is (707) 290-1166.

What is Carl Fessenden's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Addiction (Substance Use Disorder), with taxonomy code 101YA0400X.

When was this NPI record last updated?

The NPPES record for Carl Fessenden 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 8 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.