Summary

Dr. Hallahan specializes in radiation oncology for lung cancer, gastro-intestinal cancer and breast cancer.

Quick Facts

  • 2.4
  • 42 years of experience
  • speaks English
  • University Of Chicago Medicine
  • 1 written review
  • 2 specialties
  • 19 areas of expertise
  • 2 board certifications
  • 6 hospital affiliations
  • 5 office locations
  • Male

Office Locations

Dr. Dennis Eugene Hallahan has 5 locations

Alton Memorial Hospital

1 Memorial DrAlton, IL 62002

Christian Hospital

11133 Dunn RdSaint Louis, MO 63136

Missouri Baptist Medical Center

3015 N Ballas RdSaint Louis, MO 63131

Saint Louis Childrens Hospital

1 Childrens PlSaint Louis, MO 63110

Barnes Jewish Hospital

1 Barnes Jewish Hospital PlzSaint Louis, MO 63110

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Dr. Dennis Eugene Hallahan, MDDr. Brian Michael Fishman, DODr. Stacy Zhao Dai, MDDr. Patricia Flynn Mckelvy, MD
Radiation OncologyInternal MedicineInternal MedicineInternal Medicine
2.4 
42 Years of Experience 14 Years of Experience 13 Years of Experience 33 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English
Alton , ILSaint Louis , MOSaint Louis , MOSaint Louis , MO
Med School: Rush Medical College Of Rush University Medical Center Med School: Lake Erie College Of Osteopathic Medicine Med School: Washington University In St Louis School Of Medicine Med School: University Of Virginia School Of Medicine
Current Profile
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Insurance Plans Accepted by Dr. Dennis Eugene Hallahan

Be sure to verify insurance information directly with your doctor's office, as it may undergo frequent changes.

Medical Specialties

Dr. Dennis Eugene Hallahan has the following 2 specialties

Specialty Expertise

Dr. Dennis Eugene Hallahan has the following 19 areas of expertise

  • Breast Cancer
  • Cancer
  • Gastrointestinal Cancer
  • Gene Therapy
  • Head and Neck Cancer
  • Hodgkin Disease
  • Hodgkin's Lymphoma
  • Internal Medicine
  • Lewis Lung Carcinoma
  • Local Neoplasm Recurrence
  • Lung Cancer
  • Prostate Cancer (Prostatic Neoplasm)
  • Radiation Therapy
  • Radioimmunotherapy
  • Skin Cancer (Experimental Melanoma)
  • Soft Tissue Cancer (Sarcoma)
  • Squamous Cell Carcinoma
  • Throat Cancer (Laryngeal Neoplasm)
  • Urogenital Cancer (Genitourinary)

Certifications, License, & Education

42 Years Experience

MEDICAL LICENSE

Medical Doctor, Missouri, 2026, Expired
Medical Doctor, Illinois, 2026, Active

EDUCATION & TRAINING

Residency

University Of Chicago Medicine

Medical School

Rush Medical College Of Rush University Medical CenterGraduated in 1984

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Frequently Asked Questions

Which hospitals is Dr. Dennis Hallahan affiliated with?
Dr. Dennis Hallahan is affiliated with Barnes Jewish West County Hospital, Alton Memorial Hospital, Barnes Jewish Hospital, Christian Hospital, Missouri Baptist Medical Center, and Saint Louis Childrens Hospital.
What languages does Dr. Dennis Hallahan speak?
Dr. Dennis Hallahan speaks English.
Does Dr. Dennis Hallahan accept my insurance?
You can see the insurance plans that Dr. Dennis Hallahan accepts on their Vitals profile.
How can I make an appointment with Dr. Dennis Hallahan?
You can find contact information for Dr. Dennis Hallahan here on Vitals.
Where is Dr. Dennis Hallahan's office located?
Dr. Dennis Hallahan's office is located at 1 Memorial Dr, Alton, IL, 62002.

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