Dr. John J. Brennan
- Gender: Male
- Experience: 28 years
- Graduated from: State University Of New York Downstate Medical Center
- Graduation year: 1993
- Sole propriator: No
- NPI: 1154353977
Dr. John J. Brennan MD
Orthopedic Surgeon
He is located at 6 Technology Drive Suite 100 in East Setauket, NY 11733. Can help patients with the following: Arthritis, Cubital Tunnel Syndrome, Low Back Pain, Metatarsal Surgery, Osteomyelitis, Wrist Surgery. His National Provider Identifier (NPI) number is 1154353977. Appointment can be made via the phone number (631) 689-6698. He also has a website where you can get more information. The website can be found at http://stcharlesorthopedics.com/. He is affiliated with 4 practices and 3 hospitals.
Conditions treated
Dr. John J. Brennan, being an orthopedic surgeon, treats the following conditions. Please be advised that this list may not be complete. For the full list of conditions treated, consult directly with Dr. John J. Brennan.
- ACL Tear
- Achilles Tendon Rupture
- Arthritis
- Avascular Necrosis
- Back Pain
- Baker's Cyst
- Bone Spurs
- Broken Bone
- Bunions
- Bursitis
- Carpal Tunnel Syndrome
- Cauda Equina Syndrome
- Cervical Radiculopathy
- Compartment Syndrome
- Cubital Tunnel Syndrome
- Degenerative Disc Disease (DDD)
- Dislocated Ankle
- Dislocated Shoulder
- Elbow Pain
- Frostbite
- Hammer Toe
- Herniated Disc
- Hip Replacement
- Iliotibial Band Syndrome (ITBS)
- Impingement Syndrome
- Ingrown Toenail
- Joint Fluid Extraction
- Knee Pain
- Knee Replacement
- Kyphoplasty
- Kyphosis
- Low Back Pain
- Lumbar Spinal Stenosis
- Meniscus Tear
- Metatarsal Surgery
- Morton's Neuroma
- Osgood-Schlatter Disease
- Osteoarthritis (OA)
- Osteomyelitis
- Patellofemoral Pain Syndrome (PFS)
- Plantar Fasciitis
- Repetitive Motion Disorders (RMDs)
- Rheumatoid Arthritis (RA)
- Rotator Cuff Tear
- Sciatica
- Scoliosis
- Separated Shoulder
- Spinal Stenosis
- Spondylolisthesis
- Spondylolysis
- Spondylosis
- Sprained Ankle
- Sprained Wrist
- Stress Fracture
- Tennis Elbow
- Trigger Finger
- Whiplash
- Wrist Surgery
Procedures Performed by Dr. John J. Brennan
Medicare Enrollment
Dr. John J. Brennan is enrolled to bill Medicare as a Practitioner - Orthopedic Surgery (also registered under: Practitioner - Sports Medicine) .
Bills through: Orthopedic Assoc Of Long Island Physicians & Medical Group Pllc
Based on Medicare's public enrollment records as of Jul 17, 2026. This reflects Medicare fee-for-service enrollment only and says nothing about other insurance, quality, outcomes, or board certification.
Payments received
Drug payment
| Zimmer Biomet | $2966 |
| Arthrex | $1000 |
| Medical Device Business Services | $675 |
Other
| Travel and Lodging | $4141 |
| Food and Beverage | $1780 |
Studies
STATE UNIVERSITY OF NEW YORK DOWNSTATE MEDICAL CENTER
Graduated in 1993Other ways to reach out
- Website: http://stcharlesorthopedics.com/
Affiliated practices
Affiliated hospitals
Looking for more Orthopedic Surgeons?
Out of the 26 orthopedic surgeons in this region, here are 10 randomly selected ones for you to explore.
- Gender: Male
- Address: Suite 700 290 East Main Street Smithtown, 11787, NY
- Gender: Male
- Address: Suite 11 14 Technology Drive East Setauket, 11733, NY
- Gender: Male
- Address: 114 Woodland Street Hartford, 6105, CT
- Gender: Male
- Address: 6 Technology Drive Suite 100 East Setauket, 11733, NY
- Gender: Male
- Address: Suite 11 14 Technology Drive East Setauket, 11733, NY
- Gender: Male
- Address: 6 Technology Drive Suite 100 East Setauket, 11733, NY
- Gender: Female
- Address: 6 Technology Drive Suite 100 East Setauket, 11733, NY
- Gender: Male
- Address: Suite 11 14 Technology Drive East Setauket, 11733, NY
- Gender: Male
- Address: Suite 1 3070 Middle Country Road Lake Grove, 11755, NY
Questions & Answers
What conditions does Dr. John J. Brennan treat?
Dr. John J. Brennan provides treatment for Arthritis, Cubital Tunnel Syndrome, Low Back Pain, Metatarsal Surgery, Osteomyelitis, Wrist Surgery. For the full list see this list.
Has Dr. John J. Brennan affiliation with hospitals?
Dr. John J. Brennan is affiliated with SUNY/STONY BROOK UNIVERSITY HOSPITAL. For the full list of hospitals see this list.
Where can you meet with Dr. John J. Brennan?
Dr. John J. Brennan's office is located at 6 Technology Drive Suite 100 in East Setauket, NY 11733.
Does Dr. John J. Brennan have affiliation with practices?
Dr. John J. Brennan is affiliated with Orthopedic Associates of Long Island. For the full list of practices see this list.