JH
34 Years of Experience
Accepting patients
Who is Dr. Hahn, Gastroenterologist in Union, NJ?
Dr. John Hahn, MD is a Gastroenterologist, who primarily practices in Union, NJ with 2 additional practice locations. He has been practicing for over 34 years and is board certified by the American Board of Internal Medicine. Dr. Hahn graduated from Rutgers and completed his residency at Umdnj-Univ Hosp, Internal Medicine. Dr. Hahn is fluent in English, Korean, and Spanish, and is currently seeing new patients. Dr. Hahn’s practice accepts Medicare, UnitedHealthcare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Hahn’s office.
What are Areas of Expertise for Dr. Hahn?
Dr. John Hahn, MD is a highly-rated, board-certified Gastroenterologist known for expertly diagnosing, treating, and managing a wide array of related conditions or procedures. Utilizing the latest medical advancements and evidence-based practices, Dr. Hahn empowers patients to confidently navigate their health journey, specializing in Colonoscopy, Peptic Acid Disorders, or comprehensive wellness support. Serving the Union/NJ community, Dr. Hahn is dedicated to enhancing lives through expert, patient-centered care.
Where did Dr. Hahn go to medical school and complete their residency?
Residency: Umdnj-Univ Hosp, Internal Medicine | UMDNJ
Medical School: Umdnj-New Jersey Med Sch- Newark Nj | Rutgers
Is Dr. Hahn board certified in Gastroenterologist?
Yes, Dr. John Hahn, MD is board certified by the American Board of Internal Medicine
What languages does Dr. Hahn speak?
Dr. Hahn and their clinical team can communicate with patients in the following languages:
English
Korean
Spanish
What conditions does Dr. Hahn treat?
As a Gastroenterologist, Dr. Hahn diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. Hahn. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly.
Also known as:
- Colon Cancer Screening
- Health Screening
- Colorectal Cancer Screening (PDQ®)
- Screening Tests to Detect Colorectal Cancer and Polyps
- Tests to Detect Colorectal Cancer and Polyps
- Colorectal Cancer Screening
- Colonoscopy Screening
- Bowel Cancer Screening
ICD-10 Codes:
- Z1211: Encounter for screening for malignant neoplasm of colon
Also known as:
- Colon Polyps
- Colonic Polyps
- Colorectal Polyps
- Intestinal Polyps
- Bowel Polyps
ICD-10 Codes:
- Z86010: Personal history of colon polyps
- Z860109: Personal history of other colon polyps
Also known as:
- Acid Reflux
- GERD
- Acid Reflux (GER & GERD) in Adults
- Acid Reflux (GER & GERD) in Children
- Acid Reflux (GER & GERD) in Infants
- Gastroesophageal Reflux
- Heartburn
- Indigestion
ICD-10 Codes:
- K219: Gastro-esophageal reflux disease without esophagitis
Also known as:
- Benign Transverse Colon Polyp
- Benign Sigmoid Colon Polyp
- Benign Descending Colon Polyp
- Benign Tumor
- Colonic Polyps
- Colon Polyps
- Non-cancerous transverse colon growth
- Transverse colon adenoma
- Transverse colon benign tumor
- Non-cancerous sigmoid colon growth
- Sigmoid colon adenoma
- Sigmoid colon benign tumor
- Non-cancerous descending colon growth
- Descending colon adenoma
- Descending colon benign tumor
ICD-10 Codes:
- D123: Benign neoplasm of transverse colon
- D125: Benign neoplasm of sigmoid colon
- D124: Benign neoplasm of descending colon
Also known as:
- Stomach Inflammation
- Stomach Disorder
- Gastritis & Gastropathy
- Gastritis
- Inflamed stomach lining
- Stomach lining inflammation
ICD-10 Codes:
- K2970: Gastritis, unspecified, without bleeding
Also known as:
- Large Intestine Diverticulosis
- Diverticulosis and Diverticulitis
- Diverticular Disease
- Colon Diverticula
- Pockets in the Colon
ICD-10 Codes:
- K5730: Diverticulosis of large intestine without perforation or abscess without bleeding
Also known as:
- Upper Middle Abdominal Pain
- Abdominal Pain
- Epigastric pain
- Pain below breastbone
- Upper stomach pain
ICD-10 Codes:
- R1013: Epigastric pain
Also known as:
- History of Adenomatous and Serrated Colon Polyps
- Colon Polyps
- Colonic Polyps
- Past Colon Polyps
- Previous Adenomas
- History of Precancerous Colon Growths
- Colorectal polyps
- Bowel polyps
- Intestinal polyps
ICD-10 Codes:
- Z860101: Personal history of adenomatous and serrated colon polyps
- K635: Polyp of colon
Also known as:
- Rectal Bleeding
- Gastrointestinal Bleeding
- Gastrointestinal (GI) Bleeding
- Anal Bleeding
- Blood in Stool
- Lower GI Bleed
ICD-10 Codes:
- K625: Hemorrhage of anus and rectum
Also known as:
- Family History of Digestive Organ Cancer
- Cancer
- Family History
- Genetic risk for gastrointestinal cancer
- Family history of GI cancer
- Hereditary digestive cancer
ICD-10 Codes:
- Z800: Family history of malignant neoplasm of digestive organs
Also known as:
- Chronic Idiopathic Constipation
- Constipation
- Functional Constipation
- Unexplained Chronic Constipation
- Long-Term Constipation
ICD-10 Codes:
- K5904: Chronic idiopathic constipation
Also known as:
- Hemorrhoids
- Piles
- Swollen Veins in Anus
- Anal Lumps
ICD-10 Codes:
- K649: Unspecified hemorrhoids
Also known as:
- Irritable Bowel Syndrome with Constipation
- Irritable Bowel Syndrome
- Irritable Bowel Syndrome (IBS)
- IBS-C
- Constipation-Predominant IBS
- Spastic Colon with Constipation
ICD-10 Codes:
- K581: Irritable bowel syndrome with constipation
Also known as:
- Diarrhea
- Loose stools
- Runny poop
- Frequent bowel movements
ICD-10 Codes:
- R197: Diarrhea, unspecified
Also known as:
- Iron Deficiency Anemia
- Anemia
- Iron
- Anemia from Iron Lack
- Low Iron Anemia
- Sideropenic Anemia
ICD-10 Codes:
- D509: Iron deficiency anemia, unspecified
Also known as:
- Stomach or Duodenum Polyp
- Stomach Disorder
- Gastric Polyp
- Duodenal Polyp
- Stomach Growth
ICD-10 Codes:
- K317: Polyp of stomach and duodenum
Which procedures does Dr. Hahn perform as a Gastroenterologist?
As a Gastroenterologist, procedures performed by a Dr. John Hahn may include:
- Colonoscopy
- Colonoscopy Consultation
- Colorectal Cancer Screening
- Endoscopic Ultrasound
- Endoscopy / Endoscopic Ultrasound
- Gastric Balloon
- Gastric Stimulator Implantation Consultation
- Gastric Stimulator Implantation Follow Up
For detailed information, please contact Dr. Hahn's office.
Does Dr. Hahn accept my insurance?
Dr. Hahn accepts most major insurance plans. Important: Please call our office at before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Hahn accept in Union, NJ?
Dr. Hahn in Union, NJ accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
All Other Third Party
Carepoint Health
Continental Benefits
CVS Health (formerly Aetna)
Express Scripts
Horizon BlueCross BlueShield
Independence Blue Cross
Keenan and Associates
Medicare
UnitedHealthcare
View All Insurances
Where is Dr. Hahn's office located?
What is Dr. Hahn's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Hahn's National Provider Identifier (NPI) number is 1538272091.
What common questions do patients ask about Dr. Hahn?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Hahn
What is Dr. John Hahn's specialty?
Dr. Hahn is a Gastroenterologist near Union, NJ. An internist focused on diagnosing and treating disorders of the digestive system, encompassing the stomach, intestines, liver, and gallbladder. This specialist manages conditions like abdominal pain, ulcers, diarrhea, cancer, and jaundice, and performs intricate diagnostic and therapeutic procedures using endoscopes to examine internal organs. Contact Dr. Hahn to book an appointment today.
Is this Dr. John Hahn affiliated with a ranked Castle Connolly Top Hospital?
No, Hahn is not affiliated with a Castle Connolly Top Hospital, but is affiliated with the following hospitals: Bayonne Medical Center. Castle Connolly Top Hospitals are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals
Where can I learn more about Gastroenterologist?
Explore Gastroenterologist with insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.
Is John Hahn accepting new patients in Union, NJ?
Yes, Dr. John Hahn is accepting new patients at this time.
Does Dr. John Hahn offer online booking?
Please contact Dr. Hahn's office for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with John Hahn?
Please contact Dr. Hahn's office for information regarding telehealth appointment availability or for scheduling assistance.
Which board certifications does Dr. John Hahn have?
Dr. John Hahn is certified by the American Board of Internal Medicine.
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