Dr. John Brennan, MD

Dr. John Brennan, MD

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Orthopedic Surgery  ·  
Male  ·  
52 y/o
(63)

Accepting new patients

Dr. John Brennan, MD is an orthopedic surgery specialist in East Setauket, NY and has been practicing for 26 years. He specializes in orthopedic surgery and sports medicine.Read his story

St. Charles Orthopedics

6 Technology Dr Ste 100

East Setauket, NY 11733
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Insurance Accepted

  • Aetna
  • Anthem
  • Beech Street (Multiplan)
  • Blue Cross Blue Shield
  • Capital District Physician's Health Plan (CDPHP)
  • Cigna
  • Commercial Insurance Company
  • Connecticare
  • EmblemHealth
  • Empire Blue Cross Blue Shield
  • Government Employees Health Association (GEHA)
  • Guardian
  • HealthFirst
  • Humana

Background Check

No malpractice claims found for New York
No disciplinary actions found for the years we collect data
No board actions found for the years we collect data
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Experience Check

Check Dr. Brennan's experience treating your condition or procedure

Dr. Brennan's Top Procedures and Conditions

Treatment Frequency
Sprains and Strains (incl. Muscle Tear)
very high
very high

Treatment Frequency

Dr. Brennan treats Sprains and Strains (incl. Muscle Tear) more than 97% of his peers

Dr. Brennan treats this condition more than 97% of his peers

Joint Pain
very high
very high

Treatment Frequency

Dr. Brennan treats Joint Pain more than 94% of his peers

Dr. Brennan treats this condition more than 94% of his peers

Osteoarthritis
very high
very high

Treatment Frequency

Dr. Brennan treats Osteoarthritis more than 94% of his peers

Dr. Brennan treats this condition more than 94% of his peers

Rating Includes other areas of care:

  • Osteoarthritis of Ankle
  • Osteoarthritis of Elbow
  • Osteoarthritis of Finger Joint
  • Osteoarthritis of Hand or Wrist
  • Osteoarthritis of Hip
  • Osteoarthritis of Knee
  • Osteoarthritis of Shoulder
  • Osteoarthritis of Spine
  • Osteoarthritis of Toe
  • Osteoarthritis of Wrist

Dr. Brennan's conditions and procedures:

  • Achilles Tendinitis
  • ACL Surgery
  • Adhesive Capsulitis
  • Ankle Fracture
  • Ankle Sprain and Achilles Tendon Sprain or Rupture
  • Ankle Sprains and Strains
  • Anterior Cruciate Ligament (ACL) or Posterior Cruciate Ligament (PCL) Tear
  • Arm Surgery
  • Arthritis
  • Arthritis of the Elbow
  • Arthroscopic Shoulder Surgery
  • Autoimmune Diseases
  • Back Pain
  • Baker’s Cyst
  • Bone Cancer
  • Bone Disorders
  • Bone Spur
  • Brachial Plexus Palsy
  • Broken Arm
  • Bursitis
  • Cancer
  • Carpal Tunnel Release
  • Carpal Tunnel Syndrome
  • Cartilage Tear
  • Cervical Spine Myelopathy
  • Chondrocalcinosis
  • Chronic Neck Pain
  • Chronic Pelvic Pain
  • Clavicle Fracture
  • Coccyx or Sacrum Fracture
  • Complex Regional Pain Syndrome (CRPS)
  • Complications of Joint Prosthesis
  • De Quervain's Disease
  • De Quervain's Release
  • Degenerative Disc Disease
  • Dislocated Joint
  • Dressing and-or Debridement of Wound, Infection, or Burn (incl. Negative Pressure Wound Therapy)
  • Elbow Bursitis
  • Elbow Fracture and Dislocation Treatment
  • Elbow Fracture and-or Dislocation Treatment, Closed
  • Elbow Fracture and-or Dislocation Treatment, Open
  • Elbow Injuries
  • Elbow Sprain
  • Enthesopathy of Hip (incl. Trochanteric Bursitis)
  • Enthesopathy of Knee (incl. Bursitis of Knee)
  • Excision of Femur or Knee
  • Femur Fracture
  • Foot and Ankle Dislocation Treatment, Closed
  • Foot and Ankle DislocationTreatment, Open
  • Foot and Ankle Fracture and Dislocation Treatment
  • Foot and Ankle Fracture Treatment, Closed
  • Foot and Ankle Fracture Treatment, Open
  • Foot and Ankle Ligament and Tendon Repair
  • Foot Conditions
  • Foot Fracture
  • Foot Sprain
  • Fracture
  • Fracture Care
  • Fracture of Hand (incl. Fingers)
  • Gait Abnormality
  • Ganglion Cyst
  • Glenoid Labrum Tear
  • Gout
  • Hammer Toe
  • Hand and Wrist Fracture and Dislocation Treatment
  • Hand and Wrist Fracture Treatment, Closed
  • Hand Conditions
  • Hand Fracture
  • Heel Spur
  • Herniated Disc
  • Hip Fracture
  • Hip Fracture and Dislocation Treatment
  • Hip Fracture and-or Dislocation Treatment, Closed
  • Hip Fracture and-or Dislocation Treatment, Open
  • Hip Replacement
  • Hip Replacement Revision
  • Hip Resurfacing
  • Hip Sprain
  • Internal Derangement of Knee
  • Intervertebral Disc Disease
  • Joint Drainage
  • Joint Pain
  • Knee and Leg Fracture and Dislocation Treatment
  • Knee and Lower Leg Fracture Treatment, Closed
  • Knee and Lower Leg Fracture Treatment, Open
  • Knee Arthroscopy
  • Knee Dislocation
  • Knee Disorders
  • Knee Fracture
  • Knee Replacement
  • Knee Replacement Revision
  • Knee Sprain
  • Knee Surgery
  • Labrum Repair
  • Lateral and Medial Epicondylitis (Tennis and Golf Elbow)
  • Lateral Collateral Ligament (LCL) Sprain
  • Leg Fracture Above Knee (incl. Hip)
  • Leg Fracture Below Knee (incl. Ankle)
  • Limb Pain
  • Low Back Pain
  • Lupus
  • Marfan Syndrome
  • Medial Collateral Ligament (MCL) Sprain
  • Meniscus Tear
  • Muscular Dystrophy (MD)
  • Myelopathy
  • Myofascial Trigger Point Injection
  • Neck Muscle Strain
  • Nerve Block, Somatic
  • Neuroplasty
  • Osteoarthritis
  • Osteoarthritis of Ankle and Foot
  • Osteoarthritis of Hand or Wrist
  • Osteoarthritis of Hands
  • Osteoarthritis of Hip
  • Osteoarthritis of Hip and Thigh
  • Osteoarthritis of Knee
  • Osteoarthritis of Shoulder
  • Osteochondritis Dissecans
  • Osteopenia
  • Partial Knee Replacement
  • Patellofemoral Pain Syndrome or Knee Pain
  • Pathological Spine Fracture
  • Pelvic Fracture
  • Peripheral Nerve Block
  • Peripheral Nerve Disorders
  • Pseudoarthrosis
  • Pyogenic Arthritis
  • Radiculopathy (Not Due to Disc Displacement)
  • Resection or Ablation of Bone Tumor, Partial or Complete Resection of Bone, Debridement of Bone
  • Rheumatoid Arthritis
  • Rotator Cuff Surgery
  • Rotator Cuff Tear
  • Runner's Knee
  • Sciatica (Not Due to Disc Displacement)
  • Scoliosis
  • Separated Femoral Epiphysis Treatment
  • Shoulder Dislocation
  • Shoulder Disorders
  • Shoulder Fracture and Dislocation Treatment
  • Shoulder Fracture Treatment
  • Shoulder Impingement Syndrome
  • Shoulder Tendinitis and Tenosynovitis
  • Sjögren's Syndrome
  • Spina Bifida
  • Spinal Cord Injury
  • Spinal Stenosis
  • Spine Deformities
  • Spine Disorders
  • Spine Fractures, Traumatic
  • Spondylitis
  • Spondylolisthesis
  • Spondylosis
  • Sprains and Strains (incl. Muscle Tear)
  • Steroid Injection
  • Synovial Biopsy
  • Systemic Chondromalacia
  • Tibia and Fibula Fractures
  • Total Knee Arthroplasty With Robotic Assistance
  • Trigger Finger
  • Trigger Finger Release
  • Trigger Point Injection
  • Viscosupplementation With Hyaluronate
  • Wrist Fracture

About Me

Dr. Brennan is board certified in orthopedic surgery and is a member of the American Association of Hip and Knee Surgeons, Medical Society of the State of New York.

Specialties

  • Orthopedic Surgery
  • Sports Medicine

Board Certifications

  • Orthopaedic Sports Medicine
  • Orthopedic Surgery

Education

St Lukes Roosevelt Hospital
Residency Hospital
St Lukes Roosevelt Hospital Center - Orthopedics
Internship Hospital
1993
SUNY Health Science Center at Brooklyn
Medical School
1993

Awards

Memberships & Affiliations

  • American Association of Hip and Knee Surgeons, Member
  • Irish-American Orthopedic Society, Member
  • Medical Society of the State of New York, Member
  • Suffolk County Medical Society, Member

Dr. Brennan's Reviews

Likelihood to recommend Dr. Brennan

4.7

Based on 63 reviews

5 Stars
92.06349206349206%
(58)
4 Stars
1.5873015873015872%
(1)
3 Stars
0%
(0)
2 Stars
1.5873015873015872%
(1)
1 Star
4.761904761904762%
(3)

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Average Wait Time
  • 10 – 15 minutes
Dr. Brennan's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
What People Say About Dr. John Brennan, MD
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No pain after 3 days of surgery and recovery was the best I ever had because of the advance technology now days. Don't be afraid. Would you rather be in pain the rest of your life? I didn't. Now I can enjoy my life. Sleep better to. The hospital stay was very good they treated me very well.
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Dr Brennan operated on both of my knees. He had a great bed side manner. He’s a great surgeon.
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dr. brennan is the best. my shoulder has never felt so good. its 8 weeks i have not taken any pain killers or over the counter drugs since the operation. i am also done with pt already. i cant say enough about the job he did. very very happy. thank you dr. brennan.
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dr. brennan is a wonderful surgeon and always has time for me in office
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very knowledgeable
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I had never had any type of surgery prior to needing this hip replacement. From the beginning Dr Brennan explained what was happening, causes and all options available. I started with cortisone shots then gel injections before proceeding with the surgery. I was Extremely anxious. Dr. Brennan and staff were patient with me, answering all my questions, again and again. All staff at St. Charles were professional and kind. very thorough in all explanations and information.
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I fell and tore my rotator cuff totally off the bone and Dr. Brennan informed me I needed surgery if I ever wanted to be able to lift my right arm again. I was afraid, but was living in constant pain and agreed to have the surgery. It has been three months since my surgery and I am no longer living in constant pain and I am able to use my right arm again. I would suggest that everyone in need of a rotator cuff repair have the surgery, and request Dr. Brennan because he is the best.
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Dr Brennan is very knowledgeable and very pleasant .I highly recommend him.I'm big into the attitudes of the doctors I choose. I will not go back to doctors who talk rudely or talk down to you.
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had a great experiance with Dr Brennan he did a great job and i am having great results so far. it was not as bad as i thought it would be.
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dr.brennan did a wonderful job repairing my rotator cuff tear. five months out and feels great
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I have to say my experience with Dr, Brennan was excellent. I had rotator cuff repair surgery and was off pain medication in 4 days. This was not what I expected , as I was told horror stories about this surgery. I would have done the surgery years ago if I knew I would have done so well.
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I am a very active 58 yo. Injured my knee. Was worried if surgery would make a bad situation worse. Did my research and found Dr Brennan. Can not believe how simple the process was. Seamless and flawless. Doctor Brennan, his staff and St Charles Hospital did a wonderful job for me. I only wished I had come to him sooner. One week after surgery I am pain free and doing my thing. Can not say enough about my positive experience.
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complete caring with dr brenan and st charles hospital
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very happy
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Dr.Brennan explained everthing to me before my surgery, and took time to answer my guestions. Very friendly staff and polite.
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had rotator cuff repair and recovered so much faster than i thought i would. Very happy!
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excellent
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Dr Brennan was patient, empathetic, accurate in his diagnosis, and overall, the best doctor I have seen. I now have a new shoulder.
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my overall treatment was fantastic. my new knee is strong and feels stable. dr brennan was the greatest from diagnosis to follow ups. I have recommended him to many of my friends.
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This was my second procedure with Dr. Brennan and i have never felt better. I look forward to getting my left shoulder done. Excellent bedside manner and i could not be happier with the results. Changed my life...
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Locations

St. Charles Orthopedics

1
  • Call
  • Fax
  • Hours
    • Mon: 9:00am - 5:00pm
    • Tue: 9:00am - 5:00pm
    • Wed: 9:00am - 5:00pm
    • Thu: 9:00am - 5:00pm
    • Fri: 9:00am - 5:00pm
    • Sat: closed
    • Sun: closed
  • Directions
2
  • Call
  • Fax
  • Hours
    • Mon: 9:00am - 5:00pm
    • Tue: 9:00am - 5:00pm
    • Wed: 9:00am - 5:00pm
    • Thu: 9:00am - 5:00pm
    • Fri: 9:00am - 5:00pm
    • Sat: closed
    • Sun: closed
  • Directions
3

Insurance accepted

Accepted insurance can change. Please double-check when making an appointment.

Aetna
Aetna HMO
Choice Plus POS II
Anthem
Pathway X Ind PPO Direct Access CT
Beech Street (Multiplan)
Blue Cross Blue Shield
Blue Card PPO
Capital District Physician's Health Plan (CDPHP)
Capital District Physician's Health Plan (CDPHP) HMO
Cigna
Cigna HMO
Cigna PPO
Great West Healthcare-Cigna PPO
Open Access Plus
Commercial Insurance Company
Connecticare
Connecticare HMO
EmblemHealth
Emblem Health
GHI
GHI PPO
Health Insurance Plan of Greater New York (HIP) PPO
Empire Blue Cross Blue Shield
Empire Blue Cross Blue Shield HMO
Prism Blue Priority EPO
Government Employees Health Association (GEHA)
GEHA
Guardian
HealthFirst
Humana
Choice Care PPO
Locals (any local)
MagnaCare
MagnaCare PPO
Medicaid
Medicare
MultiPlan
MultiPlan PPO
PHCS Network
PHCS Network PPO
Oxford Health Plans
Freedom Plan
POMCO Group
UnitedHealthCare
Choice Plus POS
Navigate HMO
Navigate POS
Options PPO
Oxford Liberty
United Healthcare
Vytra Health Plans
Worker's Compensation
Worker's Compensation WC

Affiliated Hospitals

Check the quality of care at hospitals where Dr. Brennan treats patients.

Learn more

Saint Charles Hospital

Port Jefferson, NY

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