Mark Willow
NPI 1386989663 · Mental Health Counselor · Saint Clairsville, OH
Mark Willow is a Mental Health Counselor provider in Saint Clairsville, OH (NPI 1386989663).
Provider details
- NPI number
- 1386989663
- Entity type
- Individual
- Primary specialty
- Mental Health CounselorBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
- License
- S 1201149 (OH)
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
13 yrs in NPPES 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
Mailing address
Registry dates
- Enumerated
- 2012-11-28
- Last updated
- 2012-11-28
Frequently asked questions
- What is Mark Willow's NPI number?
- Mark Willow's National Provider Identifier (NPI) is 1386989663, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Willow's specialty?
- Mark Willow is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).
- Where is Mark Willow located?
- Mark Willow's practice location on file with NPPES is 107 Plaza Dr, Saint Clairsville, OH 43950-8786.
- What is Mark Willow's phone number?
- The practice phone number listed in the NPPES registry for Mark Willow is (740) 526-0204.
- Is Mark Willow's NPI active?
- Yes — Mark Willow's NPI (1386989663) is active in the NPPES registry as of the last update on 2012-11-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.