IndividualActive
Mark O'Brien, MS, LCPC
NPI 1932427986 · Professional Counselor · Chicago, IL
Mark O'Brien, MS, LCPC is a Professional Counselor provider in Chicago, IL (NPI 1932427986).
Provider details
- NPI number
- 1932427986
- Entity type
- Individual
- Primary specialty
- Professional CounselorBehavioral Health & Social Service Providers
- Credential
- MS, LCPC
- Sex
- Male
- Sole proprietor
- Yes
- License
- 180008079 (IL)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(77/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 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.
Mailing address
605 N Michigan Ave Fl 4
Chicago, IL 60611-3141
Registry dates
- Enumerated
- 2010-05-13
- Last updated
- 2019-09-20
Frequently asked questions
- What is Mark O'Brien's NPI number?
- Mark O'Brien's National Provider Identifier (NPI) is 1932427986, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark O'Brien's specialty?
- Mark O'Brien is listed in the NPPES registry with a primary specialty of Professional Counselor (Behavioral Health & Social Service Providers).
- Where is Mark O'Brien located?
- Mark O'Brien's practice location on file with NPPES is 605 N Michigan Ave Fl 4, Chicago, IL 60611-3141.
- Is Mark O'Brien's NPI active?
- Yes — Mark O'Brien's NPI (1932427986) is active in the NPPES registry as of the last update on 2019-09-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.