Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

WILLIAM DAVIS BALBIRNIE CATC I
NPI 1912819509
Counselor - Addiction (Substance Use Disorder) in National City, CA

Q: What is William Balbirnie's NPI number?

The NPI number for William Balbirnie is 1912819509. It was assigned to this individual provider in the NPPES registry on September 19, 2026.

Q: What is William Balbirnie'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 William Balbirnie 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 September 19, 2026

2131 E. 7TH ST, NATIONAL CITY, CA 91950(949) 745-0138 Get Directions Write a Review

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

Record update history: Sep 29, 2026, Sep 19, 2026 (2 updates tracked since 2026).

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About William Davis Balbirnie Catc I NPPES

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

WILLIAM DAVIS BALBIRNIE CATC I (NPI 1912819509) is an individual addiction (substance use disorder) provider in National City, California, licensed in California (1128831) and active in the NPI registry since September 2026.

NPPES Registry Identity

NPI1912819509

Entity TypeIndividualMale

Primary Taxonomy101YA0400X

Provider Legal NameWILLIAM DAVIS BALBIRNIECredential: CATC I

Location Address2131 E. 7TH STNational City, CA 91950

Mailing Address24 Beacon WayAliso Viejo, CA 92656-2699 · (949) 745-0138

Phone(949) 745-0138

Sole ProprietorYes

Enumeration DateSeptember 19, 2026

Last NPPES UpdateSeptember 29, 20262 updates tracked since enumeration

NPPES CertifiedSeptember 29, 2026

✔ NPI 1912819509 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

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

Taxonomy Code101YA0400X

License✔ Licensed in CA · 1128831

2131 E. 7TH ST, National City, CA 91950

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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 William Balbirnie's NPI number?

The NPI number for William Balbirnie is 1912819509. It was assigned to this individual provider in the NPPES registry on September 19, 2026.

Where is William Balbirnie located?

William Balbirnie practices at 2131 E. 7th St, National City, CA 91950. The listed phone number is (949) 745-0138.

What is William Balbirnie'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 William Balbirnie 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.