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Mark Gronski, LPC
NPI 1841565363 · Clinical Social Worker · O Fallon, MO
Mark Gronski, LPC is a Clinical Social Worker provider in O Fallon, MO (NPI 1841565363).
Provider details
- NPI number
- 1841565363
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LPC
- Sex
- Male
- Sole proprietor
- Yes
- License
- 2005000398 (MO)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(80/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
14 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
311 S Main St
Suite 100
O Fallon, MO 63366-2807
Phone: (636) 281-1990
Fax: (636) 281-1995
Street-level locationGet directions
Mailing address
9200 Watson Rd
Saint Louis, MO 63126-1528
Registry dates
- Enumerated
- 2012-03-16
- Last updated
- 2012-03-16
Frequently asked questions
- What is Mark Gronski's NPI number?
- Mark Gronski's National Provider Identifier (NPI) is 1841565363, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Gronski's specialty?
- Mark Gronski is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mark Gronski located?
- Mark Gronski's practice location on file with NPPES is 311 S Main St, O Fallon, MO 63366-2807.
- What is Mark Gronski's phone number?
- The practice phone number listed in the NPPES registry for Mark Gronski is (636) 281-1990.
- Is Mark Gronski's NPI active?
- Yes — Mark Gronski's NPI (1841565363) is active in the NPPES registry as of the last update on 2012-03-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.