EverydayHealthLogo
Dr. Stuart Gordon, MD

Dr. Stuart Gordon, MD

Lebanon, NH

Accepting patients

Affiliated with a Castle Connolly Top Hospital

    Who is Dr. Gordon, Gastroenterologist in Lebanon, NH?

    Dr. Stuart Gordon, MD is a Gastroenterologist, who primarily practices in Lebanon, NH with 2 additional practice locations. He is board certified. Dr. Gordon graduated from Columbia Univ College of Physicians And Surgeons and completed his residency at Mary Hitchcock Mem Hosp, Gastroenterology; Dartmouth-Hitchcock M C, Internal Medicine. Dr. Gordon is fluent in English, and is currently seeing new patients. Dr. Gordon’s practice accepts Cigna, Medicare, UnitedHealthcare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Gordon’s office at (603) 650-5000.

    What are Areas of Expertise for Dr. Gordon?

    Dr. Stuart Gordon, 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. Gordon empowers patients to confidently navigate their health journey, specializing in Endoscopic Ultrasound, Pancreatic & Biliary Disease, Pancreatic/Biliary Endoscopy (ERCP), or comprehensive wellness support. Serving the Lebanon/NH community, Dr. Gordon is dedicated to enhancing lives through expert, patient-centered care.

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

    • Residency: Mary Hitchcock Mem Hosp, Gastroenterology; Dartmouth-Hitchcock M C, Internal Medicine | Dartmouth-Hitchcock Medical Center Program

    • Medical School: Columbia Univ Coll of Physicians And Surgeons, New York Ny | Columbia Univ College of Physicians And Surgeons

    Is Dr. Gordon board certified as a Gastroenterologist?

    Yes, Dr. Stuart Gordon, MD is board certified by the American Board of Internal Medicine

    What languages does Dr. Gordon speak?

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

    • English

    What conditions does Dr. Gordon treat?

    As a Gastroenterologist, Dr. Gordon 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. Gordon. 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:

    • Pancreatic Cyst
    • Other Specific Pancreatic Disease
    • Pancreatic Disease
    • Cyst on Pancreas
    • Pancreatic Pseudocyst
    • Fluid Sac on Pancreas
    • Miscellaneous Pancreas Disorders
    • Named Pancreatic Conditions
    • Other Defined Pancreas Problems

    ICD-10 Codes:

    • K862: Cyst of pancreas
    • K8689: Other specified diseases of pancreas

    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:

    • Blocked Esophagus
    • Esophagus Disorder
    • Esophageal Obstruction
    • Food Pipe Blockage
    • Swallowing Difficulty

    ICD-10 Codes:

    • K222: Esophageal obstruction

    Also known as:

    • Barrett's Esophagus with High-Grade Dysplasia
    • Esophagus Disorder
    • Barrett’s Esophagus
    • Advanced Barrett's esophagus
    • Barrett's esophagus with severe cell changes', 'Precancerous Barrett's esophagus

    ICD-10 Codes:

    • K22711: Barrett's esophagus with high grade dysplasia

    Also known as:

    • Chronic Pancreatitis
    • Pancreatitis
    • Hereditary pancreatitis
    • Long-Term Pancreas Inflammation
    • Ongoing Pancreatitis

    ICD-10 Codes:

    • K861: Other chronic pancreatitis

    Also known as:

    • Other Specific Bile Duct and Gallbladder Disease
    • Bile Duct Disease
    • Gallbladder Disease
    • Specific Biliary Disorders
    • Named Bile Duct Conditions
    • Other Defined Biliary Diseases

    ICD-10 Codes:

    • K838: Other specified diseases of biliary tract

    What procedures does Dr. Gordon perform?

    As a Gastroenterologist, Dr. Gordon 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. Gordon. 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
    • Colonoscopy with Biopsy
    • Diagnostic Colonoscopy with Biopsy
    • Colonoscopy with Tissue Removal
    • Colonoscopy with Endoscopic Ultrasound
    • Colonoscopy with Bleeding Control
    • 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
    • Flexible colonoscopy with EMR
    • Endoscopic mucosal resection (colon)
    • Colon polyp removal during colonoscopy
    • EUS Colonoscopy
    • Endoscopic Ultrasound of Colon
    • Flexible Colonoscopy with EUS
    • Endoscopic Hemostasis
    • Colonoscopy for Bleeding

    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)
    • 45390: Colonoscopy, flexible; with endoscopic mucosal resection
    • 45391: Colonoscopy, flexible; with endoscopic ultrasound examination limited to the rectum, sigmoid, descending, transverse, or ascending colon and cecum, and adjacent structures
    • 45382: Colonoscopy, flexible; with control of bleeding, any method

    Also known as:

    • Upper Endoscopy with Ultrasound (EUS)
    • Upper Endoscopy with Tumor Ablation
    • Upper Endoscopy with Polyp Removal
    • Upper Endoscopy with Stomach/Duodenum Dilation
    • EGD with endoscopic ultrasound
    • Esophageal ultrasound
    • Stomach ultrasound endoscopy
    • Duodenal ultrasound endoscopy
    • EGD with Ablation
    • Esophagus, Stomach, Duodenum Scope with Ablation
    • Flexible Endoscopy Lesion Treatment
    • EGD with Polypectomy
    • Esophagus, Stomach, Duodenum Scope with Removal
    • Flexible Endoscopy Tumor Excision
    • EGD with Dilation
    • Esophageal Dilation
    • Stomach Stricture Widening
    • Duodenal Stricture Repair

    CPT Codes:

    • 43259: Esophagogastroduodenoscopy, flexible, transoral; with endoscopic ultrasound examination, including the esophagus, stomach, and either the duodenum or a surgically altered stomach where the jejunum is examined distal to the anastomosis
    • 43270: Esophagogastroduodenoscopy, flexible, transoral; with ablation of tumor(s), polyp(s), or other lesion(s) (includes pre- and post-dilation and guide wire passage, when performed)
    • 43251: Esophagogastroduodenoscopy, flexible, transoral; with removal of tumor(s), polyp(s), or other lesion(s) by snare technique
    • 43245: Esophagogastroduodenoscopy, flexible, transoral; with dilation of gastric/duodenal stricture(s) (eg, balloon, bougie)

    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
    • EGD with Esophageal Balloon Dilation
    • EGD with Endoscopic Ultrasound
    • Esophagus Widening Procedure (Endoscopic)
    • Upper Endoscopy with Mucosal Resection
    • Upper Endoscopy with Injections
    • Colonoscopy with Injections
    • ERCP with Biopsy
    • Upper Endoscopy with Varices Banding
    • Flexible Sigmoidoscopy with Biopsy
    • Flexible Sigmoidoscopy with Endoscopic Ultrasound
    • ERCP with Gallstone or Pancreatic Stone Removal
    • Small Intestine Endoscopy with Biopsy
    • Colonoscopy
    • Colorectal Cancer Screening Tests
    • EGD with Biopsy
    • Esophagogastroduodenoscopy
    • Upper GI Endoscopy
    • Stomach Scope with Sample
    • Upper Endoscopy with Esophageal Dilation
    • Flexible Esophagoscopy with Balloon
    • EGD with Balloon Widening
    • Upper GI Endoscopy with Ultrasound
    • EUS (Endoscopic Ultrasound)
    • Esophagus, Stomach, Duodenum Ultrasound
    • Esophageal Dilation
    • EGD with Dilation
    • Upper Endoscopy with Widening
    • EGD with Mucosal Resection
    • Endoscopic Removal of Esophageal Lesion
    • Flexible Endoscopy with Tissue Removal
    • EGD with Submucosal Injections
    • Esophagogastroduodenoscopy with Injections
    • Stomach Scope with Medication
    • Flexible Colonoscopy with Injection
    • Colon Scope with Medication
    • Therapeutic Colonoscopy
    • Endoscopic Retrograde Cholangiopancreatography with Biopsy
    • Bile Duct Biopsy (ERCP)
    • Pancreatic Duct Biopsy (ERCP)
    • EGD with Band Ligation
    • Esophageal Varices Banding
    • Gastric Varices Treatment
    • Sigmoid Colon Scope with Biopsy
    • Lower Endoscopy with Tissue Sample
    • Flexible Sigmoidoscopy and Biopsy
    • Rectum and Lower Colon Exam
    • Sigmoidoscopy with EUS
    • Lower Endoscopy with Ultrasound
    • Rectum and Lower Colon Exam with Ultrasound
    • Endoscopic Retrograde Cholangiopancreatography
    • Bile Duct Stone Removal
    • Pancreatic Stone Lithotripsy
    • Enteroscopy with Biopsy
    • Small Bowel Endoscopy
    • Intestinal Biopsy (Endoscopic)

    CPT Codes:

    • 43235: Esophagogastroduodenoscopy, flexible, transoral; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)
    • 43249: Esophagogastroduodenoscopy, flexible, transoral; with transendoscopic balloon dilation of esophagus (less than 30 mm diameter)
    • 43237: Esophagogastroduodenoscopy, flexible, transoral; with endoscopic ultrasound examination limited to the esophagus, stomach or duodenum, and adjacent structures
    • 43248: Esophagogastroduodenoscopy, flexible, transoral; with insertion of guide wire followed by passage of dilator(s) through esophagus over guide wire
    • 43254: Esophagogastroduodenoscopy, flexible, transoral; with endoscopic mucosal resection
    • 43236: Esophagogastroduodenoscopy, flexible, transoral; with directed submucosal injection(s), any substance
    • 45381: Colonoscopy, flexible; with directed submucosal injection(s), any substance
    • 43261: Endoscopic retrograde cholangiopancreatography (ERCP); with biopsy, single or multiple
    • 43244: Esophagogastroduodenoscopy, flexible, transoral; with band ligation of esophageal/gastric varices
    • 45331: Sigmoidoscopy, flexible; with biopsy, single or multiple
    • 45341: Sigmoidoscopy, flexible; with endoscopic ultrasound examination
    • 43265: Endoscopic retrograde cholangiopancreatography (ERCP); with destruction of calculi, any method (eg, mechanical, electrohydraulic, lithotripsy)
    • 44361: Small intestinal endoscopy, enteroscopy beyond second portion of duodenum, not including ileum; with biopsy, single or multiple

    Also known as:

    • Upper Endoscopy with Ultrasound and Biopsy
    • Biopsy
    • Endoscopy
    • Ultrasound
    • EGD with Endoscopic Ultrasound Biopsy
    • Transoral EUS-FNA
    • Esophagogastroduodenoscopy with Biopsy

    CPT Codes:

    • 43242: Esophagogastroduodenoscopy, flexible, transoral; with transendoscopic ultrasound-guided intramural or transmural fine needle aspiration/biopsy(s) (includes endoscopic ultrasound examination of the esophagus, stomach, and either the duodenum or a surgically altered stomach where the jejunum is examined distal to the anastomosis)

    Also known as:

    • ERCP with Stent Placement
    • ERCP with Sphincterotomy
    • ERCP for Bile/Pancreatic Stent Exchange
    • ERCP with Bile or Pancreatic Duct Stent Removal
    • Diagnostic ERCP
    • ERCP with Bile Duct Dilation
    • ERCP with Tumor Removal
    • Endoscopic Retrograde Cholangiopancreatography with Stent
    • Bile Duct Stent Placement via ERCP
    • Pancreatic Duct Stent Placement via ERCP
    • Endoscopic retrograde cholangiopancreatography
    • Bile duct scope
    • Pancreatic duct scope
    • Papillotomy
    • Bile duct stent replacement (ERCP)
    • Endoscopic retrograde cholangiopancreatography with stent exchange
    • Biliary stent removal and replacement
    • Pancreatic duct stent exchange
    • Endoscopic Retrograde Cholangiopancreatography
    • Bile Duct Stent Removal
    • Pancreatic Duct Foreign Body Removal
    • ERCP Stone Removal
    • Endoscopic Retrograde Cholangiopancreatography with Dilation
    • Bile Duct Widening via ERCP
    • Pancreatic Duct Balloon Dilation
    • Endoscopic Retrograde Cholangiopancreatography with Ablation
    • Bile Duct Tumor Removal ERCP
    • Pancreatic Duct Lesion Ablation

    CPT Codes:

    • 43274: Endoscopic retrograde cholangiopancreatography (ERCP); with placement of endoscopic stent into biliary or pancreatic duct, including pre- and post-dilation and guide wire passage, when performed, including sphincterotomy, when performed, each stent
    • 43262: Endoscopic retrograde cholangiopancreatography (ERCP); with sphincterotomy/papillotomy
    • 43276: Endoscopic retrograde cholangiopancreatography (ERCP); with removal and exchange of stent(s), biliary or pancreatic duct, including pre- and post-dilation and guide wire passage, when performed, including sphincterotomy, when performed, each stent exchanged
    • 43275: Endoscopic retrograde cholangiopancreatography (ERCP); with removal of foreign body(s) or stent(s) from biliary/pancreatic duct(s)
    • 43260: Endoscopic retrograde cholangiopancreatography (ERCP); diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)
    • 43277: Endoscopic retrograde cholangiopancreatography (ERCP); with trans-endoscopic balloon dilation of biliary/pancreatic duct(s) or of ampulla (sphincteroplasty), including sphincterotomy, when performed, each duct
    • 43278: Endoscopic retrograde cholangiopancreatography (ERCP); with ablation of tumor(s), polyp(s), or other lesion(s), including pre- and post-dilation and guide wire passage, when performed

    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:

    • Upper GI Endoscopy with Ultrasound Biopsy
    • Biopsy
    • Endoscopy
    • Ultrasound
    • EGD with EUS-FNA
    • Endoscopic Ultrasound Biopsy
    • Esophageal/Stomach Biopsy

    CPT Codes:

    • 43238: Esophagogastroduodenoscopy, flexible, transoral; with transendoscopic ultrasound-guided intramural or transmural fine needle aspiration/biopsy(s), (includes endoscopic ultrasound examination limited to the esophagus, stomach or duodenum, and adjacent structures)

    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:

    • Stopping Bleeding in Esophagus, Stomach, or Duodenum
    • EGD with Bleeding Control
    • Upper GI Endoscopy for Bleeding
    • Gastric Bleeding Treatment

    CPT Codes:

    • 43255: Esophagogastroduodenoscopy, flexible, transoral; with control of bleeding, any method

    Also known as:

    • Endoscopic Tube Placement into Bile or Pancreatic Duct
    • ERCP Cannulation
    • Bile Duct Cannulation
    • Pancreatic Duct Access (Endoscopic)

    CPT Codes:

    • 43273: Endoscopic cannulation of papilla with direct visualization of pancreatic/common bile duct(s) (List separately in addition to code(s) for primary procedure)

    Also known as:

    • Esophagus Pouch Removal and Muscle Cut
    • Zenker's diverticulum surgery
    • Hypopharyngeal diverticulectomy
    • Cricopharyngeal myotomy
    • Rigid esophagoscopy with diverticulectomy

    CPT Codes:

    • 43180: Esophagoscopy, rigid, transoral with diverticulectomy of hypopharynx or cervical esophagus (eg, Zenker's diverticulum), with cricopharyngeal myotomy, includes use of telescope or operating microscope and repair, when performed

    Also known as:

    • Feeding Tube Placement with Endoscopy
    • PEG Tube Placement
    • Gastrostomy Tube Insertion
    • EGD with Feeding Tube
    • Percutaneous Endoscopic Gastrostomy

    CPT Codes:

    • 43246: Esophagogastroduodenoscopy, flexible, transoral; with directed placement of percutaneous gastrostomy tube

    Also known as:

    • EGD with Ultrasound-Guided Injection
    • Upper Endoscopy with EUS Injection
    • Esophagus, Stomach, Duodenum Ultrasound
    • Transmural Injection via Endoscopy

    CPT Codes:

    • 43253: Esophagogastroduodenoscopy, flexible, transoral; with transendoscopic ultrasound-guided transmural injection of diagnostic or therapeutic substance(s) (eg, anesthetic, neurolytic agent) or fiducial marker(s) (includes endoscopic ultrasound examination of the esophagus, stomach, and either the duodenum or a surgically altered stomach where the jejunum is examined distal to the anastomosis)

    Also known as:

    • Sigmoidoscopy with Polyp Removal
    • Colorectal Cancer Screening Tests
    • Flexible Sigmoidoscopy with Polypectomy
    • Colon Polyp Removal (Lower Colon)
    • Sigmoid Colon Lesion Excision
    • Lower Endoscopy with Polyp Removal

    CPT Codes:

    • 45338: Sigmoidoscopy, flexible; with removal of tumor(s), polyp(s), or other lesion(s) by snare technique

    Also known as:

    • EGD with Pseudocyst Drainage
    • Endoscopic Pseudocyst Drainage
    • Transoral Pseudocyst Stent Placement
    • Pancreatic Pseudocyst Drainage (Endoscopic)
    • Stomach Cyst Drainage

    CPT Codes:

    • 43240: Esophagogastroduodenoscopy, flexible, transoral; with transmural drainage of pseudocyst (includes placement of transmural drainage catheter[s]/stent[s], when performed, and endoscopic ultrasound, when performed)

    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 GI Scope with Stent Placement
    • EGD with Stent
    • Esophageal Stent Placement
    • Stomach Stent Insertion

    CPT Codes:

    • 43266: Esophagogastroduodenoscopy, flexible, transoral; with placement of endoscopic stent (includes pre- and post-dilation and guide wire passage, when performed)

    Does Dr. Gordon accept my insurance?

    Dr. Gordon accepts most major insurance plans. Important: Please call our office at (603) 650-5000 before your appointment to verify that your specific plan and network are accepted.

    What insurance plans does Dr. Gordon accept in Lebanon, NH?

    Dr. Gordon in Lebanon, NH accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.

    Top Insurances

    • BCBS Unspecified

    • BlueCross and BlueShield of Vermont

    • Centene

    • Cigna

    • CVS Health (formerly Aetna)

    • Elevance Health Inc. (formerly Anthem)

    • Medicare

    • State of Tennessee

    • State of Vermont

    • UnitedHealthcare

    View All Insurances

    Where is Dr. Gordon's office located?

    Dr. Stuart Gordon's Primary Practice

    1 Medical Center Dr

    Lebanon, NH 03756

    (603) 650-5000

    Get Directions

    Dr. Stuart Gordon's Practice 2

    25 S River Rd

    Bedford, NH 03110

    Get Directions

    Dr. Stuart Gordon's Practice 3

    87 McGregor St

    Manchester, NH 03102

    Get Directions

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

    Dr. Gordon's National Provider Identifier (NPI) number is 1992711469.

    What common questions do patients ask about Dr. Gordon?

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

    What is Dr. Stuart Gordon's specialty?

    Dr. Gordon is a Gastroenterologist near Lebanon, 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. Gordon to book an appointment today.

    Is this Dr. Stuart Gordon affiliated with a ranked Castle Connolly Top Hospital?

    Yes, Dr. Gordon is affiliated with Dartmouth Hitchcock Medical Center 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 Stuart Gordon accepting new patients in Lebanon, NH?

    Yes, Dr. Stuart Gordon is accepting new patients at this time.

    Does Dr. Stuart Gordon offer online booking?

    Please contact Dr. Gordon's office at (603) 650-5000 for information about online booking, telehealth, or to schedule an appointment.

    How can I make an appointment with Stuart Gordon?

    Please contact Dr. Gordon's office at (603) 650-5000 for information regarding telehealth appointment availability or for scheduling assistance.

    Which board certifications does Dr. Stuart Gordon have?

    Dr. Stuart Gordon is certified by the American Board of Internal Medicine.

    Other Gastroenterologist Near Lebanon, NH

    MC

    Gastroenterologist

    acceptingPatients-iconAccepting patients
    Lebanon, NH
    HS

    Gastroenterologist

    acceptingPatients-iconAccepting patients
    Lebanon, NH
    SN

    Gastroenterologist

    acceptingPatients-iconAccepting patients
    Lebanon, NH
    See All Specialists

    Doctors by Category

    Specialists