What is Mark Walker's NPI number?

Mark Walker's National Provider Identifier (NPI) is 1649154584, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Mark Walker's specialty?

Mark Walker is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).

Where is Mark Walker located?

Mark Walker's practice location on file with NPPES is 11166 Fairfax Blvd Ste 201, Fairfax, VA 22030-5017.

What is Mark Walker's phone number?

The practice phone number listed in the NPPES registry for Mark Walker is (703) 988-4236.

Is Mark Walker's NPI active?

Yes — Mark Walker's NPI (1649154584) is active in the NPPES registry as of the last update on 2025-08-04.

IndividualActive

Mark Walker

NPI 1649154584 · Mental Health Counselor · Fairfax, VA

Mark Walker is a Mental Health Counselor provider in Fairfax, VA (NPI 1649154584).

Provider details

NPI number: 1649154584
Entity type: Individual
Primary specialty: Mental Health CounselorBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: No
License: 0704018280 (VA)

Specialties & taxonomies

Mental Health CounselorPrimary101YM0800XLicense 0704018280 (VA)
Behavioral Health & Social Service Providers

Profile Score

Established profile(54/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
Under 1 yr in registry
Profile completeness38% of score
100% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

11166 Fairfax Blvd Ste 201

Fairfax, VA 22030-5017

Phone: (703) 988-4236

Fax: (703) 721-7598

Street-level locationGet directions

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Mailing address