What is Mark Williams's NPI number?

Mark Williams's National Provider Identifier (NPI) is 1578241949, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Mark Williams's specialty?

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

Where is Mark Williams located?

Mark Williams's practice location on file with NPPES is 1525 S State Road 15a, Deland, FL 32720-7771.

What is Mark Williams's phone number?

The practice phone number listed in the NPPES registry for Mark Williams is (386) 753-7767.

Is Mark Williams's NPI active?

Yes — Mark Williams's NPI (1578241949) is active in the NPPES registry as of the last update on 2026-02-11.

IndividualActive

Mark Williams

NPI 1578241949 · Mental Health Counselor · Deland, FL

Mark Williams is a Mental Health Counselor provider in Deland, FL (NPI 1578241949).

Provider details

NPI number: 1578241949
Entity type: Individual
Primary specialty: Mental Health CounselorBehavioral Health & Social Service Providers
Sex: Male
Sole proprietor: Yes

Specialties & taxonomies

Mental Health CounselorPrimary101YM0800X
Behavioral Health & Social Service Providers

Profile Score

Established profile(52/100 index)

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

Registry tenure38% of score
2 yrs in NPPES registry
Profile completeness38% of score
83% 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

1525 S State Road 15a

Deland, FL 32720-7771

Phone: (386) 753-7767

Street-level locationGet directions

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Mailing address