Dr. Daniel Kleiner, MD

Dr. Daniel Kleiner, MD

Complex General Surgical Oncology  |  
Male  |  
Age 46
Insurances AcceptedSave
Dr. Daniel Kleiner, MD is a complex general surgical oncology doctor who practices in Danbury, CT. He is 46 years old and has been practicing for 17 years. Dr. Kleiner is affiliated with Norwalk Hospital and Danbury Hospital.

111 Osborne St # 209

Danbury, CT 06810

Contact Information

(203) 739-7131

Insurance Accepted

  • Aetna
  • Beech Street (Multiplan)
  • Blue Cross Blue Shield
  • Cigna
  • Commercial Insurance Company
  • Connecticare
  • First Health (Coventry Health Care)
  • MagnaCare
  • Medicaid
  • 6 More

*Please verify this information when scheduling an appointment.

Learn about Dr. Kleiner

Be confident in your decisions by checking out your provider's top areas of care, education, patient reviews and more. Learn about finding the right doctor for you

Top Care Areas


See how frequently Dr. Kleiner performs your care needs compared to other doctors.

Stomach and Small Intestine Cancer
very high
more than 96% of peers
Stomach Cancer
very high
more than 94% of peers
Laparoscopic Surgical Procedure
more than 83% of peers

Dr. Kleiner's percentages are based on the rate of treatment compared to peers nationwide from insurance data. Learn more info about our data and this Top Care Areas component.

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Care Philosophy

This content was provided by Dr. Kleiner "As a surgeon, I embrace the multidisciplinary approach to ensure total care for all of my patients. I utilize minimally invasive surgery to help you return to your usual lifestyle quicker and more comfortably."


  • Complex General Surgical Oncology
  • General Surgery
  • Oncology
  • Surgery

Board Certifications

  • General Surgery
    Accredited by: American Board of Surgery*

Conditions Treated

  • Acute Leukemia
  • Acute Lymphoid Leukemia
  • Acute Myeloid Leukemia
  • Adrenal Gland Cancer
  • All Lymphoma
  • Anal Disorders
  • Anal and Rectal Cancer
  • Anemia
  • Autoimmune Diseases
  • Bile Duct Cancer
  • Bladder Cancer
  • Bleeding Disorders
  • Blood Disorders
  • Bone Cancer
  • Bone Disorders
  • Brain Disorders
  • Breast Cancer
  • Breast Diseases
  • Cancer
  • Central Nervous System Lymphoma
  • Coagulation Disorders (incl. Hemophilia)
  • Esophageal Cancer
  • Esophageal Diseases
  • Gallbladder Cancer
  • Gallbladder and Biliary Tract Cancer
  • Gastrointestinal Diseases
  • Gynecologic Cancer
  • Head and Neck Cancer
  • Hepatobiliary Cancer
  • Hodgkin's Disease
  • Hypercoagulable State
  • Immune Thrombocytopenic Purpura (ITP)
  • Kidney Cancer
  • Larynx Conditions
  • Leukocytosis
  • Liver Cancer
  • Lung Cancer
  • Lymphoma, Large-Cell
  • Lymphosarcoma
  • Mantle Cell Lymphoma
  • Melanoma
  • Myelodysplastic Syndromes
  • Myeloproliferative Disorders
  • Neuroendocrine Tumors
  • Neutropenia
  • Nodular Lymphoma
  • Non-Hodgkin's Lymphoma
  • Oral Cancer
  • Osteosarcoma
  • Pancreatic Cancer
  • Pancytopenia
  • Polycythemia Rubra Vera
  • Primary Central Nervous System Lymphoma
  • Primary Hypercoagulable State (incl. Factor V Leiden Disease)
  • Prostate Cancer
  • Pulmonary Disease
  • Purpura
  • Reticulosarcoma
  • Retina Diseases
  • Secondary Hypertension
  • Sickle Cell Disease
  • Skin Cancer
  • Small Intestine Cancer
  • Soft Tissue Sarcoma
  • Stomach Cancer
  • Stomach Diseases
  • Stomach and Small Intestine Cancer
  • Testicular Cancer
  • Thalassemia
  • Thrombocytosis
  • Tongue Cancer
  • Urinary Disorders
  • Uterine Cancer
  • Uterine Diseases
  • Vascular Disease


Read More


  • Adrenalectomy
  • Advanced Laparoscopic Surgery
  • Bile Duct Procedure
  • Bone Marrow Biopsy
  • Colon and Rectal Surgery
  • Distal Pancreatectomy
  • Esophageal Surgery
  • Excision of Bile Duct Tumor
  • Excision of Rectal Tumor
  • Gastrectomy
  • Gastroenterology Procedures
  • Head and Neck Surgery
  • Laparoscopic Surgical Procedure
  • Laparoscopic Tumor Ablation, Liver
  • Liver Resection
  • Lung Surgery
  • Minimally Invasive Surgery
  • Open Tumor Ablation, Liver
  • Port Placements or Replacements
  • Removal of Reproductive Organs (Hysterectomy, Oophorectomy, Salpingectomy, Salpingo-Oophorectomy, Resection of Peritoneal Malignancy)
  • Removal or Destruction of Rectal or Intestinal Tumor (incl. Colonoscopy, Proctosigmoidoscopy, Sigmoidoscopy and Control of Hemorrhage)
  • Thoracentesis
  • Whipple Procedure

Background Check

0 Malpractice Claims

No malpractice history found for Connecticut.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • Macalester College, St. Paul, Minnesota
    Undergraduate School | Graduated 1994
  • University Of St. Andrews, Scotland
    Undergraduate School | Graduated 1995
  • University Of Newcastle
    Medical School | Graduated 2000
  • Hunter Area Health Service, Australia
    Internship Hospital | Completed 2002
  • University Of Virginia
    Residency Hospital | Completed 2009
  • University Of Virginia
    Fellowship Hospital | Completed 2010
  • Washington University, St Louis
    Fellowship Hospital | Completed 2013
  • Faculty Clincial Instructor, University Of Virgina-Minimally Invasive Surgery
    Other Education | Completed 2012
  • Royal Australasian College Of Physicians
    Other Education | Completed 2009
  • Surgical Registrar, Division Of Surgery, Hunter Area Health Service, Australia
    Other Education | Completed 2004

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Kleiner has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

Dr. Kleiner does not have any memberships or affiliations listed. If you are Dr. Kleiner and would like to add memberships or affiliations, please update your profile.

Dr. Kleiner's Reviews

Likelihood of recommending Dr. Kleiner to family and friends
based on 14 total reviews (12 with comments)
Dr. Kleiner's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    Under 10 minutes
Patient Comments (12)
in Southbury, CT |
I don't think there are enough positive adjectives I can say about Dr. Kleiner. I have spent the last two years in and out of the hospital, had two unsuccessful surgeries by highly recognized Dr.s in major hospitals in Boston and New York. I had an appointment days after my initial call, and a week and a half later he performed surgery. He explained my problem and why his surgery would help when others didn't. He was very compassionate, professional and skilled. I'm so thankful
in Danbury, CT |
Dr. Kleiner is one of the kindest, knowledgeable doctors I have ever had. He took the time to explain everything to me and answered all my questions. He was very caring when I did not take my news especially well, and when he did my surgery, was there when I awoke to give me good news. I don't have enough good things to say about him and the team he as working with him, I am so very grateful that I had my surgery with him.
in Wilton, CT |
First visit Dr. Kleiner was thorough, clear, rational, open, and honest. He looked us in the eyes and shared his surgery statistics with us in an unblinking manner. His capabilities for what was to be a very complicated procedure seemed very clear to us, and in retrospect (after healing), we were very pleased. We could not have found a better surgeon. He had the technical and medical skills, as well as an excellent, unhurried patient bedside manner.
Southbury, CT |
Very caring doctor. Keeps you informed and more than willing to answer any questions. Good bedside manner.
in Danbury, CT |
Dr. Kleiner was very patient and thorough in explaining what was going to happen regarding my surgery . Also , his followup after the surgery gave me a great sense of well being .
in Gaylordsville, CT |
Dr Kleiner performed a complicated surgery on me. The results were great! During my 10 day stay at Danbury Hospital, it became apparent that his skills are held in high regard by all the nursing staff that I encountered. Also, he makes sure that his patients get nothing but the best of care. I highly recommend Dr Kleiner, and if I ever need surgery that falls within his speciality again, I will certainly insist on his services.
in Newtrown, CT |
He conveys confidence and knowledge regarding your malady. His explanation as to what needs to be done was very clear and helpful. After my operation was completed his daily visits told me exactly what was about to happen pertaining to my recovery. He was correct each time. I will most certainly recommend him to serve my family and friends. He is the type of doctor we all need. A wonderful surgeon.
Ridgefield, CT |
Dr. Kleiner took excellent care of my 86-year old mother. Although her surgery was simpler than many he performs, he was just as thorough and involved as if it had been much more serious. We were very pleased with him and would recommend him to anyone. Danbury Hospital is very fortunate to have Dr. Kleiner on staff.
in Southbury, CT |
Very easy going, knowledgeable Dr. with great bedside manor. Great listener, understood the level of anxiety a cancer diagnoses brings but shared thoughts, plans and PT care plan that eased my anxiety !
in Sandy Hook, CT |
An outstanding caring individual who also is a gifted surgeon. If you are seeking a physician stop right here, this is the one you were looking for. After months of abdominal pain my daughter was diagnosed and treated in near record time by Dr Kleiner. surgical intervention was the only choice and this was the man to do it.
in Norwalk, CT |
Dr. Daniel Kleiner is the best surgeon you can trust. He and is staff like Mary Lou made me feel that I am in caring, experienced and calm professionals who looked me straight in the eyes and explained everything in detail simply to understand. A year ago I had my whippel surgery and feel like a brand new person. I thank my lucky starts and all my guardian angels that I found Dr. Kleiner.
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Now Accepting New Patients
Dr. Kleiner accepts 15 insurance carriers
  • Aetna
  • Beech Street (Multiplan)
  • Blue Cross Blue Shield
  • Cigna
  • Commercial Insurance Company
  • Connecticare
  • First Health (Coventry Health Care)
  • MagnaCare
  • Medicaid
  • Medicare
    Special Needs Plan SNP
  • MultiPlan
  • MVP Health Care
  • Oxford Health Plans
  • PHCS
  • UnitedHealthCare
    United Healthcare

*Please verify this information when scheduling an appointment.

Hospitals where Dr. Kleiner has admitting privileges

Norwalk Hospital
34 Maple St
Norwalk, CT 06850
View Hospital Profile
Danbury Hospital
24 Hospital Ave
Danbury, CT 06810
View Hospital Profile

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