Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mr. Mark W Colterjohn, LCSW

Individual provider Clinical Social Worker · NPI 1356457642

Mr. Mark W Colterjohn, LCSW is a Clinical Social Worker in New York, New York. Qualified in 1994, 32 years ago. Practices as a sole proprietor, works from 3 locations and accepts Medicare assignment. Licensed in New York.

Years since qualifying
32
Licensed in
NY
In the registry since
2006
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

353 Lexington Ave Ste 300
New York, NY 10016-0941
Phone: (646) 872-5451
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 672 Fulton St Apt 3b, Brooklyn, NY 11217-1569 — (646) 872-5451
  • 920 Broadway, New York, NY 10010-6004 — (646) 872-5451

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 070239 (NY)

Record details

NPI number1356457642
Entity typeIndividual (Type 1)
GenderMale
Credentials LCSW
Sole proprietorYes
NPI enumeratedAugust 21, 2006
Last updated in NPPESApril 25, 2025
Certification dateApril 25, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 1994 (32 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients13
Services billed 565 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Other providers in New York