Deborah Blenner M.D.

Internal Medicine • Smithtown, NY

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About

Deborah Blenner M.D. is a general practitioner and board-certified internist in Smithtown, NY, offering primary care, weight management, adolescent care, and sleep disorder treatment for the whole family. The practice provides services including women's health, men's health, nutrition, immunizations, and annual exams.

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Clinic Type

Internal Medicine

Address

45 Terry Rd. Suite B Smithtown, NY 11787

Phone

(631) 656-8171

Email

dblenner@sienaproactive.com

Opening Hours

8:00 am - 4:00 pm; 9:00 am - 5:00 pm; 12:00 pm - 8:00 pm

Website

https://www.sienaproactive.com/

Services Offered

general practitioner
internal medicine
weight management
adolescent care
sleep disorders
whole family medicine
sleep disorder therapy
weight loss

Insurance & Payment

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Languages Spoken

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Current Offers

New patient information

FAQs

What services does Deborah Blenner M.D. offer?

General practitioner, internal medicine, weight management, adolescent care, sleep disorders, and family medicine.

What are the hours of operation?

8:00 am - 4:00 pm, 9:00 am - 5:00 pm, 12:00 pm - 8:00 pm

What is the full address for the location?

45 Terry Road, Suite B, Smithtown, NY 11787

What is the contact phone number?

(631) 656-8171

What is the contact email?

[email protected]

Social Media

Twitter Facebook Instagram

Photos

What Patients Say

Overall sentiment across review platforms: positive

Catholic Health (official practice site): 4.9 out of 5 (270 ratings, 38 reviews)
WebMD: 4.5 out of 5 (14 ratings)

Patients praise

Thorough and caring patient care
Excellent communicator who listens to concerns
Highly recommended by many patients for being personable and knowledgeable
Efficient office staff and minimal wait times for many patients

Common complaints

Some patients reported frustration regarding appointment policies, specifically that new patient visits are restricted to physicals and additional concerns require separate appointments
One patient expressed dissatisfaction, claiming the focus was on financial gain rather than medical issues

"I love Dr Blenner!! She's amazing, thorough when making sure she covers everything, very easy to talk with, she really cares!! I have already recommended my friends to come to her."

— Catholic Health Patient Review

"Dr. Blenner is absolutely HORRIBLE!! I went as a new patient & she didn't want to hear any issues I had... just a physical. She told me that I would need another appointment to tell her any issues."

— Vitals Patient Review

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 11, 2026. Own this clinic? Claim or correct this listing.