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

BRIAN MATTHEW MACMILLAN
NPI 1134027097
Counselor - Addiction (Substance Use Disorder) in Costa Mesa, CA

Q: What is Brian Macmillan's NPI number?

The NPI number for Brian Macmillan is 1134027097. It was assigned to this individual provider in the NPPES registry on October 29, 2026.

Q: What is Brian Macmillan'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 Brian Macmillan was last updated on October 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 October 29, 2026

1555 MESA VERDE DR E APT 45J, COSTA MESA, CA 92626(714) 908-0028 Get Directions Write a Review

NPPES record added: October 29, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Brian Matthew Macmillan NPPES

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

BRIAN MATTHEW MACMILLAN (NPI 1134027097) is an individual addiction (substance use disorder) provider in Costa Mesa, California and active in the NPI registry since October 2026.

NPPES Registry Identity

NPI1134027097

Entity TypeIndividualMale

Primary Taxonomy101YA0400X

Provider Legal NameBRIAN MATTHEW MACMILLAN

Location Address1555 MESA VERDE DR E APT 45JCosta Mesa, CA 92626-5209

Mailing Address1555 Mesa Verde Dr E Apt 45jCosta Mesa, CA 92626-5209 · (714) 908-0028

Phone(714) 908-0028

Sole ProprietorYes

Enumeration DateOctober 29, 2026

NPPES CertifiedOctober 29, 2026

✔ NPI 1134027097 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

1555 MESA VERDE DR E APT 45J, Costa Mesa, CA 92626

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

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 Brian Macmillan's NPI number?

The NPI number for Brian Macmillan is 1134027097. It was assigned to this individual provider in the NPPES registry on October 29, 2026.

Where is Brian Macmillan located?

Brian Macmillan practices at 1555 Mesa Verde Dr E Apt 45J, Costa Mesa, CA 92626. The listed phone number is (714) 908-0028.

What is Brian Macmillan'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 Brian Macmillan was last updated on October 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.