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

Diane Kristina Witmer, LCSW

Individual provider Clinical Social Worker · NPI 1033771225

Diane Kristina Witmer, LCSW is a Clinical Social Worker in East Islip, New York. Qualified in 2010, 16 years ago. Practices with Coffee County Hospital Group Inc, a 88-clinician group and accepts Medicare assignment. Licensed in New York, Tennessee and Virginia.

Years since qualifying
16
Licensed in
NY, TN, VA
In the registry since
2019
Specialties on file
3
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

56 Marilynn St
East Islip, NY 11730-2703
Phone: (631) 338-3913
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 7058 (TN)
Clinical Social Worker Taxonomy 1041C0700X · Licence 088174 (NY)
Clinical Social Worker Taxonomy 1041C0700X · Licence 0904011127 (VA)

Record details

NPI number1033771225
Entity typeIndividual (Type 1)
GenderFemale
Credentials LCSW
Sole proprietorYes
NPI enumeratedJuly 8, 2019
Last updated in NPPESNovember 27, 2023

Medicare enrollment

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

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 2010 (16 years in practice)
Group practice Coffee County Hospital Group Inc — 88 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 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 patients16
Services billed 66 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

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.

Colleagues at Coffee County Hospital Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 88 clinicians in the practice; 12 are shown here.

Other providers in East Islip