Mark Siar
NPI 1174476774 · Addiction (Substance Use Disorder) Counselor · Ridgeland, SC
Mark Siar is a Addiction (Substance Use Disorder) Counselor provider in Ridgeland, SC (NPI 1174476774).
Provider details
- NPI number
- 1174476774
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
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
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
Mailing address
Registry dates
- Enumerated
- 2026-02-16
- Last updated
- 2026-02-16
- Certified
- 2026-02-16
Frequently asked questions
- What is Mark Siar's NPI number?
- Mark Siar's National Provider Identifier (NPI) is 1174476774, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Siar's specialty?
- Mark Siar is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Mark Siar located?
- Mark Siar's practice location on file with NPPES is 124 Boardwalk Dr Ste a, Ridgeland, SC 29936-7994.
- What is Mark Siar's phone number?
- The practice phone number listed in the NPPES registry for Mark Siar is (843) 645-2770.
- Is Mark Siar's NPI active?
- Yes — Mark Siar's NPI (1174476774) is active in the NPPES registry as of the last update on 2026-02-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.