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DR. MARI ANTOINETTE ALEXANDER PHD, LPC-MHSP
NPI 1003184987
Counselor - Mental Health in Columbia, SC

Active since December 07, 2011
2805 RIVER DR, COLUMBIA, SC 29201(617) 777-6594(617) 221-3260 Get Directions Write a Review

NPPES record last updated: September 29, 2025. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Record update history: Dec 25, 2022, Jun 15, 2020 (2 updates tracked since 2020).

About Dr. Mari Antoinette Alexander Phd, Lpc-mhsp NPPES

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

DR. MARI ANTOINETTE ALEXANDER PHD, LPC-MHSP (NPI 1003184987) is an individual mental health provider in Columbia, South Carolina, licensed in Tennessee (2768) and active in the NPI registry since December 2011.

NPPES Registry Identity

NPI1003184987
Entity TypeIndividualFemale
Primary Taxonomy101YM0800X
Provider Legal NameDR. MARI ANTOINETTE ALEXANDERCredential: PHD, LPC-MHSP
Location Address2805 RIVER DRColumbia, SC 29201-1605
Mailing Address2805 River DrColumbia, SC 29201-1605 · (615) 400-2504 · Fax (615) 447-1065
Phone(617) 777-6594
Fax(617) 221-3260
Sole ProprietorYes
Enumeration DateDecember 7, 2011
Last NPPES UpdateSeptember 29, 20252 updates tracked since enumeration
NPPES CertifiedSeptember 29, 2025
✔ NPI 1003184987 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers
Taxonomy Code101YM0800X
License✔ Licensed in TN · 2768
Also ListedCounselor · Addiction (Substance Use Disorder)Taxonomy 101YA0400X · License 2768 (TN)
2805 RIVER DR, Columbia, SC 29201
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Other Names 1

Former Name (1)Dr. Mari Antoinette Ross Phd, Lpc-mhsp

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Harvard Pilgrim Health Care, Providence Health Plan.Insurance ›

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 Mari Alexander's NPI number?

The NPI number for Mari Alexander is 1003184987. It was assigned to this individual provider in the NPPES registry on December 7, 2011. The provider is also known as Dr. Mari Antoinette Ross Phd, Lpc-Mhsp.

Where is Mari Alexander located?

Mari Alexander practices at 2805 River Dr, Columbia, SC 29201. The listed phone number is (617) 777-6594.

What is Mari Alexander's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

What insurance does Mari Alexander accept?

Health plans from Harvard Pilgrim Health Care and Providence Health Plan list Mari Alexander as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Mari Alexander was last updated on September 29, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.