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Dr. John R Peterson, MD

Washington, MO

Accepting patients

Affiliated with a Castle Connolly Top Hospital

    Who is Dr. Peterson, Gastroenterologist in Washington, MO?

    Dr. John R Peterson, MD is a Gastroenterologist, who primarily practices in Washington, MO with 2 additional practice locations. Dr. Peterson is fluent in English, and is currently seeing new patients. Dr. Peterson’s practice accepts Medicare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Peterson’s office at (636) 239-7344.

    Where did Dr. Peterson go to medical school and complete their residency?

    • Medical School: Tulane University of Louisiana --

    What languages does Dr. Peterson speak?

    Dr. Peterson and their clinical team can communicate with patients in the following languages:

    • English

    What conditions does a Gastroenterologist like Dr. Peterson typically treat?

    As a Gastroenterologist, Dr. Peterson 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. Peterson. 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. Learn more about our claims-based healthcare methodology.

    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:

    • Benign Ascending Colon Polyp
    • Benign Transverse Colon Polyp
    • Benign Cecum Polyp
    • Benign Tumor
    • Colonic Polyps
    • Colon Polyps
    • Non-cancerous ascending colon growth
    • Ascending colon adenoma
    • Ascending colon benign tumor
    • Non-cancerous transverse colon growth
    • Transverse colon adenoma
    • Transverse colon benign tumor
    • Non-cancerous cecum growth
    • Cecal adenoma
    • Cecum benign tumor

    ICD-10 Codes:

    • D122: Benign neoplasm of ascending colon
    • D123: Benign neoplasm of transverse colon
    • D120: Benign neoplasm of cecum

    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:

    • Dark, Tarry Stools (Melena)
    • Gastrointestinal Bleeding
    • Melena
    • Black Stools
    • Upper GI Bleed Signs

    ICD-10 Codes:

    • K921: Melena

    Also known as:

    • Follow-up After Treatment (Non-Cancer)
    • Post-Treatment Check-up
    • Aftercare Visit
    • Recovery Monitoring Exam

    ICD-10 Codes:

    • Z09: Encounter for follow-up examination after completed treatment for conditions other than malignant neoplasm

    Also known as:

    • Colon Polyps
    • Colonic Polyps
    • Colorectal polyps
    • Bowel polyps
    • Intestinal polyps

    ICD-10 Codes:

    • K635: Polyp of colon

    What procedures does a Gastroenterologist like Dr. Peterson typically perform?

    As a Gastroenterologist, Dr. Peterson performs a variety of medical procedures. This procedure information is derived from anonymized insurance claims and highlights the medical procedures most commonly performed by Dr. Peterson. 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. Learn more about our claims-based healthcare methodology.

    Also known as:

    • Colonoscopy with Polyp Removal
    • Colonoscopy with Biopsy
    • Diagnostic Colonoscopy with Biopsy
    • Colonoscopy
    • Colorectal Cancer Screening Tests
    • Flexible Colonoscopy with Polypectomy
    • Colon Polyp Removal
    • Colorectal Lesion Excision
    • Flexible Colonoscopy
    • Colon Biopsy
    • Large Intestine Scope
    • Colorectal Cancer Screening
    • Colon Exam with Biopsy
    • Lower Endoscopy
    • Colon Cancer Screening

    CPT Codes:

    • 45385: Colonoscopy, flexible; with removal of tumor(s), polyp(s), or other lesion(s) by snare technique
    • 45380: Colonoscopy, flexible; with biopsy, single or multiple
    • 45378: Colonoscopy, flexible; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)

    Also known as:

    • Upper Endoscopy with Biopsy
    • Biopsy
    • Endoscopy
    • EGD with Biopsy
    • Gastroscopy with Biopsy
    • Esophagogastroduodenoscopy with Biopsy

    CPT Codes:

    • 43239: Esophagogastroduodenoscopy, flexible, transoral; with biopsy, single or multiple

    Also known as:

    • Diagnostic Upper Endoscopy with Biopsy
    • Colonoscopy with Injections
    • EGD with Esophageal Balloon Dilation
    • Colonoscopy
    • Colorectal Cancer Screening Tests
    • EGD with Biopsy
    • Esophagogastroduodenoscopy
    • Upper GI Endoscopy
    • Stomach Scope with Sample
    • Flexible Colonoscopy with Injection
    • Colon Scope with Medication
    • Therapeutic Colonoscopy
    • Upper Endoscopy with Esophageal Dilation
    • Flexible Esophagoscopy with Balloon
    • EGD with Balloon Widening

    CPT Codes:

    • 43235: Esophagogastroduodenoscopy, flexible, transoral; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)
    • 45381: Colonoscopy, flexible; with directed submucosal injection(s), any substance
    • 43249: Esophagogastroduodenoscopy, flexible, transoral; with transendoscopic balloon dilation of esophagus (less than 30 mm diameter)

    Also known as:

    • Upper Endoscopy with Polyp Removal
    • EGD with Polypectomy
    • Esophagus, Stomach, Duodenum Scope with Removal
    • Flexible Endoscopy Tumor Excision

    CPT Codes:

    • 43251: Esophagogastroduodenoscopy, flexible, transoral; with removal of tumor(s), polyp(s), or other lesion(s) by snare technique

    Does Dr. Peterson accept my insurance?

    Dr. Peterson accepts most major insurance plans. Important: Please call our office at (636) 239-7344 before your appointment to verify that your specific plan and network are accepted.

    What insurance plans does Dr. Peterson accept in Washington, MO?

    Dr. Peterson in Washington, MO accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.

    Top Insurances

    • Blue Cross Blue Shield Association

    • Centene Corporation

    • Cigna Group

    • CVS Health (formerly Aetna)

    • Elevance Health Inc. (formerly Anthem)

    • Healthcare Advantage

    • Humana

    • Medicare

    • UMR Administered Payer

    • UnitedHealth Group

    View All Insurances

    Where is Dr. Peterson's office located?

    Dr. John R Peterson's Primary Practice

    901 Patients First Dr Ste 3300

    Washington, MO 63090

    (636) 239-7344

    Get Directions

    Dr. John R Peterson's Practice 2

    1326 S Service Rd W Ste 300

    Sullivan, MO 63080

    Get Directions

    Dr. John R Peterson's Practice 3

    200 Brevco Plz Ste 208

    Lake St Louis, MO 63367

    Get Directions

    What is Dr. Peterson's NPI number?A National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.

    Dr. Peterson's National Provider Identifier (NPI) number is 1164639274.

    What common questions do patients ask about Dr. Peterson?

    Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Peterson

    What is Dr. John R Peterson's specialty?

    Dr. Peterson is a Gastroenterologist near Washington, MO.

    What does a Gastroenterologist do?

    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.

    Is Dr. John R Peterson affiliated with a ranked Castle Connolly Top Hospital?

    Yes, Dr. Peterson is affiliated with Mercy Hospital Washington, Missouri Baptist Medical Center, Northwestern Memorial Hospital, Mercy Hospital St. Louis, Mercy Hospital Lincoln which are a Castle Connolly Top Hospitals. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They 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

    When to see a Gastroenterologist?: Guides for symptoms, conditions, and treatments

    Understand your symptoms and know when it’s time to see a Gastroenterologist. Explore 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 Dr. John R Peterson accepting new patients in Washington, MO?

    Yes, Dr. John R Peterson is accepting new patients at this time.

    Does Dr. John R Peterson offer online booking?

    Please contact Dr. Peterson's office at (636) 239-7344 for information about online booking, telehealth, or to schedule an appointment.

    How can I make an appointment with Dr. John R Peterson?

    Please contact Dr. Peterson's office at (636) 239-7344 to schedule an appointment.

    Where is Dr. Peterson's office located?

    Dr. Peterson's offices are located in Washington, MO, Sullivan, MO, and Lake St Louis, MO.