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Dr. Keith Brennan, MD

Internal Medicine* Age 40
Dr. Keith Brennan, MD
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Dr. Keith Brennan, MD is an Internist in Oceanside, NY.
Dr. Keith Brennan, MD
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Dr. Keith Brennan, MD

Internal Medicine* Age 40
Oceanside, NY
Call for new patient details
Dr. Keith Brennan, MD is an Internist in Oceanside, NY.

About

Dr. Keith Brennan, MD is an Internist in Oceanside, NY. Dr. Brennan currently practices at Practice and are affiliated with Saint John's Episcopal Hospital at South Shore and Mount Sinai South Nassau. Dr. Brennan's office is not accepting new patients. Dr. Brennan is board certified in Internal Medicine and accepts multiple insurance plans.

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Experience Check

Enter a condition or procedure
Urinary Tract Infection (UTI)
Rhabdomyolysis
Asphyxia and Hypoxemia
Urinary Tract Infection (UTI)
Rhabdomyolysis
Asphyxia and Hypoxemia
Urinary Tract Infection (UTI)
Rhabdomyolysis
Asphyxia and Hypoxemia
Acute Bronchitis
Acute Lower Respiratory Infection
Cachexia
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Constipation
Dehydration
Foot Infection
Intestinal Diverticulitis
Pharyngitis
Shortness of Breath
Tobacco Use Disorder
Urinary Incontinence
Venous Embolism and Thrombosis
Arterial Blood Gas Test (ABG)
Electrocardiogram (EKG)
Abdominal Pain
Acidosis
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Acute Deep Vein Thrombosis (DVT)
Acute Kidney Infection
Acute Laryngitis
Acute Pharyngitis
Acute Sinusitis
Acute Upper Respiratory Infection
Acute Venous Embolism Thrombosis
ADHD and-or ADD
Adhesive Capsulitis Shoulder
Adult Failure to Thrive
Alkalosis
All Headaches (incl. Migraine)
Allergic Conjunctivitis
Allergic Rhinitis
Anal or Rectal Pain
Anemia
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Anxiety
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Arthritis
Arthritis of the Elbow
Arthritis of the Neck
Asthma
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Ataxia
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Atherosclerosis
Athlete's Foot
Back Pain
Bedsores
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Benign Chronic Pain Syndrome
Bladder Infection
Blood in Urine (Hematuria)
Bronchiectasis
Bronchitis
Bronchospasm
Bruise of Face, Scalp, or Neck
Calcium Metabolism Disorders
Carpal Tunnel Syndrome
Cellulitis
Chest Pain
Chronic Deep Vein Thrombosis (DVT)
Chronic Fatigue Syndrome
Chronic Neck Pain
Chronic Pain
Chronic Sinusitis
Chronic Venous Embolism Thrombosis
Cluster Headache
COPD (Chronic Obstructive Pulmonary Disease)
Cough
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Deep Vein Thrombosis (DVT)
Dermatitis Due to Drugs
Dermatitis Due to Substances Taken Internally
Diabetes Type 1
Diabetes Type 2
Diabetes With Renal Manifestations
Diabetic Polyneuropathy
Diaper Rash
Diarrhea
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Difficulty With Walking
Dizziness
Down Syndrome
Dysentery
Dyslipidemia
Dysphagia
Eczema and Contact Dermatitis
Emphysema
Enlarged Prostate (BPH)
Enteritis
Esophagitis
Essential Tremor
Fever
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Fibromyalgia
Folliculitis
Gait Abnormality
Gastritis
Gastroesophageal Reflux Disease (GERD)
Gastroparesis
Gastroptosis
Gout
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Headache
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Heart Disease
Heart Palpitations
Hemorrhoids
Hernia
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Herpes Simplex Infection
Herpes Zoster Without Complication
Human Immunodeficiency Virus (HIV)
Hydrocele
Hypercalcemia
Hyperkalemia
Hyperlipidemia
Hypersensitivity Pneumonitis
Hypertension
Hypoglycemia
Hypokalemia
Hypotension
Hypotension (Excluding Maternal)
Hypothyroidism
Hypoxemia
Influenza (Flu)
Insomnia
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Intestinal Diverticulosis
Iron Metabolism Disorders
Irritable Bowel Syndrome
Itchy Skin
Jock Itch
Joint Pain
Kidney Infection
Knee Sprain
Laryngitis
Leg and Foot Ulcers
Leukocytopenia
Limb Pain
Limb Swelling Caused by Fluid Overload
Lipid Disorders
Liver Damage from Alcohol
Low Back Pain
Lymphangitis
Magnesium Metabolism Disorders
Malaise and Fatigue
Malnutrition
Menstrual Disorders
Migraine
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Mineral Metabolism Disorders
Muscle Cramping
Muscle Weakness
Mycobacterial Lung Infection
Nail and Nail Bed Infection
Nail Infection
Nausea
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Neurogenic Bladder
Nighttime Urination (Nocturia)
Noninfectious Gastroenteritis and Colitis
Nosebleed
Obesity
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Onychomycosis
Osteoarthritis
Osteoarthritis of Foot
Osteoarthritis of Hand
Osteoarthritis of Hand or Wrist
Osteoarthritis of Hip
Osteoarthritis of Hip and Thigh
Osteoarthritis of Knee
Osteoarthritis of Shoulder
Osteoarthritis of Spine
Osteopenia
Osteoporosis
Otitis Media
Overactive Bladder
Overweight
Painful Urination (Dysuria)
Patellofemoral Pain Syndrome (PFPS)
Peptic Ulcer
Pericardial Disease
Phlebitis and Thrombophlebitis
Phosphorus Metabolism Disorders
Pinkeye (Conjunctivitis)
Pneumonia
Pollen Allergy
Polymyalgia Rheumatica (PMR)
Polyneuropathy
Polyuria
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Postnasal Drip
Prostatitis
Purpura
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Radiculopathy
Rash
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Reflux Esophagitis
Restless Leg Syndrome
Ringworm
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Salivary Gland Stones and Inflammation
Sarcoidosis
Scabies
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Sciatica
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Sebaceous Cysts
Secondary Diabetes Mellitus
Secondary Hypertension
Sexually Transmitted Diseases (STDs)
Shingles
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Sickle Cell Disease
Sinus Bradycardia
Sinus Tachycardia
Sinusitis
Skin Ulcer
Sleep Apnea
Sprains and Strains (incl. Muscle Tear)
Strep Throat
Swine Flu
Thrush
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Thyroid Goiter
Tobacco Withdrawal
Tonsillitis
Transient Ischemic Attack (TIA)
Trichomoniasis
Trigeminal Neuralgia
Urinary Stones
Venous Insufficiency
Vertigo
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Viral Enteritis
Viral Hepatitis
Viral Infection
Vitamin B Deficiency
Vitamin B12 Deficiency
Vitamin D Deficiency
Wheezing
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Yeast Infections
Advance Directive End of Life Planning
Fecal Occult Blood Test for Colorectal Cancer
Immunization Administration
Smoking Cessation Counseling

Insurance Accepted

* Please verify this information when scheduling an appointment.
  • BluePPO HSA PPO
    SimplyBlue/Simply Blue Plus PPO
  • MVP Health Plan EPO
  • High Performance Network - Tiered HPN
    Blue Card High Performance Network HPN
    Blue Card PPO
  • MagnaCare PPO
  • Empire Hospital
    Blue Acess Employer Sponsored
    National Blue High Performance Network
    Connection Blue High Performance Network
    Connection Employer Sponsored
    Empire Blue Cross Blue Shield PPO
    Empire Hospital/Medical (Trad)
  • AWH NJ Choice MultiTier POS II
    Savings Plus of Metro, NY
    Choice Plus POS II
    Aetna HMO
    Premier Care Network Plus - Innovation Health
    APCN Open Access Aetna Select
    Select
    Signature Administrators PPO
    Elect Choice (Open Access) EPO
    Open Choice PPO
    Premier Care Network APCN Choice (OAMC) POS II
    Managed Choice (Open Access) POS
  • Pro Plus Plans EPO
    Total Plans EPO
    Pro Plans EPO
  • Choice Plus POS
    Nexus Open Access
    Navigate HMO
    Navigate POS
    Options PPO
  • Liberty
    Freedom

Locations

  1. 1 South Nassau Communities Hospital
    1 Healthy Way, Oceanside, NY 11572
    Icon Directions Right Arrow Directions Phone Icon (516) 632-3000

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Dr. Brennan's Office & Staff

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About Me

Specialties*
Internal Medicine
Specialties*
  • *Sharecare does not verify qualifications for medical specialties. Please verify your provider's specialty and qualifications directly with your provider and applicable medical board.
Education

Board Certifications

Board Certifications
  • Internal Medicine
Board Certifications
What’s a board certification and why is it important that my provider has one?

A board certification represents a provider’s dedication to ongoing training in one or more specialties, including the completion of intensive exams. While not all specialties have board certifications, if your provider does have one they’ve taken the extra step to master their specialty and to keep up with the latest advancements in their field.

Residency

Residency Hospital
  • Roger Williams Medical Center
    2014
Residency Hospital

Fellowship

Fellowship Hospital
  • Winthrop - University Hospital
    2015
Fellowship Hospital
Common Questions and Answers
Responses are sourced directly from patients.
Does Dr. Brennan communicate via email?
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Does Dr. Brennan specialize in working with children or adolescents?
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Frequently Asked Questions

Find contact information here to make an appointment.

A list of accepted insurance providers is available on the Sharecare insurance check. It is always a good idea to verify your insurance when making an appointment.

New patients are generally accepted by Dr. Keith Brennan, MD. To arrange an appointment, call the number on Dr. Brennan's profile.

Dr. Keith Brennan, MD is affiliated with Saint John's Episcopal Hospital at South Shore and Mount Sinai South Nassau.

Yes, Dr. Keith Brennan, MD holds board certification in Internal Medicine.

Hospital Affiliations

  • Saint John's Episcopal Hospital at South Shore

    327 Beach 19th St, Far Rockaway, NY

  • Mount Sinai South Nassau

    1 Healthy Way, Oceanside, NY