JD
25 Years of Experience
Accepting patients
Affiliated with a Castle Connolly Top Hospital
Who is Dr. Dowd, Gastroenterologist in Manchester, NH?
Dr. John Dowd, DO is a Gastroenterologist, who primarily practices in Manchester, NH with 2 additional practice locations. He has been practicing for over 25 years. Dr. Dowd graduated from University of Osteopathic Medicine and Health Sciences and completed his residency at Norwalk Hosp, Gastroenterology; Umdnj-Sch Of Osteo Med, Internal Medicine. Dr. Dowd is fluent in English, and is currently seeing new patients. Dr. Dowd’s practice accepts Cigna, Medicaid, Medicare, UnitedHealthcare, Aetna and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Dowd’s office at (978) 287-3835.
What are Areas of Expertise for Dr. Dowd?
Dr. John Dowd, DO 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. Dowd empowers patients to confidently navigate their health journey, specializing in Colon Cancer Screening, Esophageal Disorders, Inflammatory Bowel Disease, Pancreatic & Biliary Disease, or comprehensive wellness support. Serving the Manchester/NH community, Dr. Dowd is dedicated to enhancing lives through expert, patient-centered care.
Where did Dr. Dowd go to medical school and complete their residency?
Residency: Norwalk Hosp, Gastroenterology; Umdnj-Sch Of Osteo Med, Internal Medicine | Kennedy Memorial Hospital Nj
Medical School: Des Moines University College of Osteopathic Medicine and Health Sciences | University of Osteopathic Medicine and Health Sciences | University of Osteopathic Medicine and Health Sciences
What languages does Dr. Dowd speak?
Dr. Dowd and their clinical team can communicate with patients in the following languages:
English
What conditions does Dr. Dowd treat?
As a Gastroenterologist, Dr. Dowd 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. Dowd. 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:
- 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:
- Colon Polyps
- Colonic Polyps
- Colorectal Polyps
- Intestinal Polyps
- Bowel Polyps
ICD-10 Codes:
- Z86010: Personal history of colon polyps
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:
- Dark, Tarry Stools (Melena)
- Gastrointestinal Bleeding
- Melena
- Black Stools
- Upper GI Bleed Signs
ICD-10 Codes:
- K921: Melena
What procedures does Dr. Dowd perform?
As a Gastroenterologist, Dr. Dowd 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. Dowd. 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:
- Colonoscopy with Polyp Removal
- Diagnostic Colonoscopy with Biopsy
- Colonoscopy with Biopsy
- Colonoscopy
- Colorectal Cancer Screening Tests
- Flexible Colonoscopy with Polypectomy
- Colon Polyp Removal
- Colorectal Lesion Excision
- Flexible Colonoscopy
- Colon Exam with Biopsy
- Lower Endoscopy
- Colon Cancer Screening
- Colon Biopsy
- Large Intestine Scope
- Colorectal Cancer Screening
CPT Codes:
- 45385: Colonoscopy, flexible; with removal of tumor(s), polyp(s), or other lesion(s) by snare technique
- 45378: Colonoscopy, flexible; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)
- 45380: Colonoscopy, flexible; with biopsy, single or multiple
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:
- EGD with Esophageal Balloon Dilation
- Diagnostic Upper Endoscopy with Biopsy
- Colonoscopy with Injections
- Upper Endoscopy with Injections
- Colonoscopy
- Colorectal Cancer Screening Tests
- Upper Endoscopy with Esophageal Dilation
- Flexible Esophagoscopy with Balloon
- EGD with Balloon Widening
- EGD with Biopsy
- Esophagogastroduodenoscopy
- Upper GI Endoscopy
- Stomach Scope with Sample
- Flexible Colonoscopy with Injection
- Colon Scope with Medication
- Therapeutic Colonoscopy
- EGD with Submucosal Injections
- Esophagogastroduodenoscopy with Injections
- Stomach Scope with Medication
CPT Codes:
- 43249: Esophagogastroduodenoscopy, flexible, transoral; with transendoscopic balloon dilation of esophagus (less than 30 mm diameter)
- 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
- 43236: Esophagogastroduodenoscopy, flexible, transoral; with directed submucosal injection(s), any substance
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
Also known as:
- ERCP with Sphincterotomy
- ERCP with Bile or Pancreatic Duct Stent Removal
- Endoscopic retrograde cholangiopancreatography
- Bile duct scope
- Pancreatic duct scope
- Papillotomy
- Endoscopic Retrograde Cholangiopancreatography
- Bile Duct Stent Removal
- Pancreatic Duct Foreign Body Removal
- ERCP Stone Removal
CPT Codes:
- 43262: Endoscopic retrograde cholangiopancreatography (ERCP); with sphincterotomy/papillotomy
- 43275: Endoscopic retrograde cholangiopancreatography (ERCP); with removal of foreign body(s) or stent(s) from biliary/pancreatic duct(s)
Also known as:
- ERCP with Gallstone Removal
- ERCP
- Endoscopic Gallstone Removal
- Biliary Duct Stone Removal
- Pancreatic Duct Cleaning
CPT Codes:
- 43264: Endoscopic retrograde cholangiopancreatography (ERCP); with removal of calculi/debris from biliary/pancreatic duct(s)
Also known as:
- Flexible Sigmoidoscopy
- Colorectal Cancer Screening Tests
- Sigmoidoscopy
- Lower colon exam
- Flexible colon scope
- Rectum and lower colon check
CPT Codes:
- 45330: Sigmoidoscopy, flexible; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)
Also known as:
- Upper Endoscopy for Foreign Body Removal
- EGD for Foreign Body
- Gastroscopy for Object Removal
- Esophagogastroduodenoscopy for Foreign Body
CPT Codes:
- 43247: Esophagogastroduodenoscopy, flexible, transoral; with removal of foreign body(s)
Also known as:
- Capsule Endoscopy
- Pill Camera
- Wireless Capsule Endoscopy
- Small Bowel Capsule Endoscopy
- Intestinal Imaging Pill
CPT Codes:
- 91110: Gastrointestinal tract imaging, intraluminal (eg, capsule endoscopy), esophagus through ileum, with interpretation and report
Also known as:
- Wireless Esophageal pH Test
- Esophageal pH Test
- Bravo pH Test
- Esophageal Reflux Monitoring
- Acid Reflux Test
CPT Codes:
- 91035: Esophagus, gastroesophageal reflux test; with mucosal attached telemetry pH electrode placement, recording, analysis and interpretation
Does Dr. Dowd accept my insurance?
Dr. Dowd accepts most major insurance plans. Important: Please call our office at (978) 287-3835 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Dowd accept in Manchester, NH?
Dr. Dowd in Manchester, NH accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
BCBS Unspecified
Blue Cross Blue Shield of Massachusetts
CVS Health (formerly Aetna)
Elevance Health Inc. (formerly Anthem)
Health Pointe
Medicare
Point32Health
State of Nevada
State of Tennessee
UnitedHealthcare
View All Insurances
Where is Dr. Dowd's office located?
Recognitions
Castle Connolly Doctor’s Choice Awards
Doctor’s Choice - 2025
Among the most nominated for the Castle Connolly Top Doctor recognition in 2025
What is Dr. Dowd's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Dowd's National Provider Identifier (NPI) number is 1164498648.
What common questions do patients ask about Dr. Dowd?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Dowd
What is Dr. John Dowd's specialty?
Dr. Dowd is a Gastroenterologist near Manchester, NH. 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. Dowd to book an appointment today.
Is this Dr. John Dowd affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Dowd is affiliated with Emerson Health which is a Castle Connolly Top Hospital. 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
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 Dowd accepting new patients in Manchester, NH?
Yes, Dr. John Dowd is accepting new patients at this time.
Does Dr. John Dowd offer online booking?
Please contact Dr. Dowd's office at (978) 287-3835 for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with John Dowd?
Please contact Dr. Dowd's office at (978) 287-3835 for information regarding telehealth appointment availability or for scheduling assistance.
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