Long Island Weight Loss Institute
Verified listingAbout Long Island Weight Loss Institute
Long Island Weight Loss Institute is a physician-run weight-loss brand, and this is its Port Jefferson Station office at 5225 Nesconset Hwy, Bld. #2, Port Jefferson Station, NY 11776, in the Davis Professional Park. On price the site gives you almost nothing: no dollar amount appears on the location page, the programs page or the landing page, and no membership tier is published. The consult is presented as free, though even that carries no stated fee, and "No insurance is needed for your free consult."
## What programmes are offered?
Four things, described at brand level rather than per office. There is a weight loss diet program, branded the LIWLI Diet Program. There is a prescription drug program. There are weight loss injections, specifically Semaglutide and Tirzepatide treatments. And there is a telehealth programme. The medications named across those pages are Semaglutide, Tirzepatide and FDA approved prescription diet pills. Which combination you end up on is decided at the consult, not on the website.
## What will it cost?
Unknown, and that is the site's choice rather than an oversight on our side. Neither the diet programme, the prescription drug programme nor the injections carry a figure. There is no fee schedule and no membership price. The one money-adjacent statement is that insurance is not needed for the free consult, which tells you the door is free and nothing about what comes after it.
## Who would I see there?
That is genuinely unresolved. The staff page publishes eighteen clinicians for the whole brand and assigns none of them to a particular office. Those named are Dr. Michael S. Kaplan, DO, ABOM; Dr. Andre Giannakopoulos, MD, ABOM; Dr. Debra Greenfield, MD; Dr. Piya Ghoshal, MD; Colleen D. Cole, MSN, APRN, FNP; Melissa M. Reilly, MSN, FNP; Nancy Thomas, RN, MSN, FNP; Grace Beauchamp, MSN, ANP; Cathleen Kneidl, PA-C; Marisa Cassara, ANP-C; Jessica John, MSN, AGPCNP-BC; Ian Nnamdi, PA-C; Christine Petras, RPA; Olivia Louis-Jacques, FNP-BC; Ashley Reynolds, FNP-BC; Toni Demarco, FNP; Victoria Barberer, MSN, AGNP-C; and Caroline Fiordalisi, ANP-C. The site says Dr. Giannakopoulos has practised "in the New York area for over 9 years" and that Cathleen Kneidl has been "working in healthcare for the past twenty-five years." If seeing a specific clinician matters to you, ask when you book.
## When is it open?
Monday to Friday, 9:00 AM to 5:00 PM, with Saturday by appointment. The site adds that it runs five days a week with two evenings and is open every other Saturday, and asks you to call and verify hours on holidays and holiday weekends. Port Jefferson Station is one of four locations in the brand, with East Meadow, Amityville and Smithtown.
## What is not published
Checked on 22 September 2026 across the Port Jefferson landing page, the brand home page, the location page, the programs index and the staff page: no cost for any programme, no consultation fee figure, no assignment of clinicians to this office, no list of states the telehealth programme serves, no service-area statement, and no description of who the programme is for.
**Sources:** https://liwliportjefferson.com · https://liwli.com/weight-loss-locations/port-jefferson-station-weight-loss-center/ · https://liwli.com/weight-loss-programs/ · https://liwli.com/long-island-diet-program-difference/our-expert-weight-loss-staff/ · https://liwli.com/