JG
Accepting patients
Affiliated with a Castle Connolly Top Hospital
Who is Dr. Gahagan, Surgeon in Pleasanton, CA?
Dr. John Gahagan, MD is a Surgeon, who primarily practices in Pleasanton, CA with 2 additional practice locations. Dr. Gahagan is fluent in English, and is currently seeing new patients. Dr. Gahagan’s practice accepts Kaiser Permanente, Medicaid, Medicare, UnitedHealthcare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Gahagan’s office at (650) 736-1270.
What languages does Dr. Gahagan speak?
Dr. Gahagan and their clinical team can communicate with patients in the following languages:
English
What conditions does Dr. Gahagan treat?
As a Surgeon, Dr. Gahagan 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. Gahagan. 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:
- Hemorrhoids
- Piles
- Swollen Veins in Anus
- Anal Lumps
- Anal veins
- Swollen rectal veins
ICD-10 Codes:
- K649: Unspecified hemorrhoids
- K648: Other hemorrhoids
Also known as:
- Colorectal Cancer
- Rectal cancer
- Colon cancer
- Bowel cancer
- Malignant neoplasm of rectum
ICD-10 Codes:
- C20: Malignant neoplasm of rectum
Also known as:
- Anal Fissure
- Anal Disorder
- Rectal Tear
- Fissure in Anus
- Perianal Fissure
ICD-10 Codes:
- K602: Anal fissure, unspecified
Also known as:
- Other Anal and Rectal Condition
- Anal Disorder
- Rectal Disorder
- Proctitis
- Anal Disorders
- Rectal Disorders
ICD-10 Codes:
- K6289: Other specified diseases of anus and rectum
Also known as:
- Anal Fistula
- Anal Disorder
- Fistulas
- Perianal Fistula
- Fistula-in-Ano
- Abnormal Anal Tract
ICD-10 Codes:
- K603: Anal fistula
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
What procedures does Dr. Gahagan perform?
As a Surgeon, Dr. Gahagan 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. Gahagan. 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:
- Diagnostic Colonoscopy with Biopsy
- Colonoscopy with Biopsy
- Colonoscopy with Polyp Removal
- Colonoscopy Through Stoma
- Colonoscopy
- Colorectal Cancer Screening Tests
- Flexible Colonoscopy
- Colon Exam with Biopsy
- Lower Endoscopy
- Colon Cancer Screening
- Colon Biopsy
- Large Intestine Scope
- Colorectal Cancer Screening
- Flexible Colonoscopy with Polypectomy
- Colon Polyp Removal
- Colorectal Lesion Excision
- Stoma Colonoscopy
- Diagnostic Stoma Scope
- Colostomy Colonoscopy
CPT Codes:
- 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
- 45385: Colonoscopy, flexible; with removal of tumor(s), polyp(s), or other lesion(s) by snare technique
- 44388: Colonoscopy through stoma; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)
Also known as:
- Anoscopy (Diagnostic)
- Anoscopy
- Anal Canal Exam
- Rectal Scope Exam
- Anus Diagnostic Procedure
CPT Codes:
- 46600: Anoscopy; diagnostic, including collection of specimen(s) by brushing or washing, when performed (separate procedure)
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:
- Hemorrhoid Removal with Rubber Band Ligation
- Internal Hemorrhoid Removal (THD)
- Rubber Band Ligation for Hemorrhoids
- Internal Hemorrhoid Ligation
- Banding of Hemorrhoids
- Hemorrhoid Banding
- Transanal Hemorrhoidal Dearterialization
- THD Procedure
- Hemorrhoid Ligation with Mucopexy
CPT Codes:
- 46221: Hemorrhoidectomy, internal, by rubber band ligation(s)
- 46948: Hemorrhoidectomy, internal, by transanal hemorrhoidal dearterialization, 2 or more hemorrhoid columns/groups, including ultrasound guidance, with mucopexy, when performed
Also known as:
- Anal Sphincter Nerve Block
- Internal Anal Sphincter Chemodenervation
- Anal Sphincter Injection
- Botox for Anal Fissure
- Chemical Denervation of Anal Muscle
CPT Codes:
- 46505: Chemodenervation of internal anal sphincter
Also known as:
- Hemorrhoid Removal Surgery
- Hemorrhoidectomy
- Piles Surgery
- Internal and External Hemorrhoid Excision
CPT Codes:
- 46255: Hemorrhoidectomy, internal and external, single column/group;
Also known as:
- Anal Fistula Surgery
- Fistulectomy
- Fistulotomy
- Intersphincteric Fistula Repair
- Perianal Fistula Surgery
- Perianal Fistula Repair
CPT Codes:
- 46275: Surgical treatment of anal fistula (fistulectomy/fistulotomy); intersphincteric
- 46270: Surgical treatment of anal fistula (fistulectomy/fistulotomy); subcutaneous
Also known as:
- Flexible Sigmoidoscopy with Biopsy
- Colorectal Cancer Screening Tests
- Sigmoid Colon Scope with Biopsy
- Lower Endoscopy with Tissue Sample
- Flexible Sigmoidoscopy and Biopsy
- Rectum and Lower Colon Exam
CPT Codes:
- 45331: Sigmoidoscopy, flexible; with biopsy, single or multiple
Also known as:
- Seton Placement
- Fistula Seton Insertion
- Drainage Seton Placement
- Anal Fistula Treatment
CPT Codes:
- 46020: Placement of seton
Also known as:
- Surgical Anorectal Exam with Anesthesia
- Anesthesia
- Diagnostic anorectal exam under anesthesia
- Rectal exam with general anesthesia
- Anorectal surgery for diagnosis
CPT Codes:
- 45990: Anorectal exam, surgical, requiring anesthesia (general, spinal, or epidural), diagnostic
Also known as:
- Removal of Rectal Tumor
- Transanal Rectal Tumor Excision
- Partial Thickness Rectal Tumor Removal
- Rectal Lesion Excision
CPT Codes:
- 45171: Excision of rectal tumor, transanal approach; not including muscularis propria (ie, partial thickness)
Also known as:
- Anal Seton Removal
- Seton Removal
- Anal Marker Removal
- Fistula Seton Removal
CPT Codes:
- 46030: Removal of anal seton, other marker
Also known as:
- Parathyroid Gland Removal or Exploration
- Parathyroidectomy
- Parathyroid Gland Surgery
- Hyperparathyroidism Surgery
CPT Codes:
- 60500: Parathyroidectomy or exploration of parathyroid(s);
Also known as:
- Removal of One Side of Thyroid Gland
- Unilateral Thyroid Lobectomy
- Thyroid Lobe Removal
- Partial Thyroidectomy
- Isthmusectomy
CPT Codes:
- 60220: Total thyroid lobectomy, unilateral; with or without isthmusectomy
Does Dr. Gahagan accept my insurance?
Dr. Gahagan accepts most major insurance plans. Important: Please call our office at (650) 736-1270 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Gahagan accept in Pleasanton, CA?
Dr. Gahagan in Pleasanton, CA accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
Alameda Alliance
All Other Third Party
Blue Shield of California
Central California Alliance for Health
Crown Cork and Seal Company
CVS Health (formerly Aetna)
Medicare
Other Health Care Provider
State of Tennessee
UnitedHealthcare
View All Insurances
Where is Dr. Gahagan's office located?
Dr. John Gahagan's Primary Practice
5725 W Las Positas Blvd Ste 100
Pleasanton, CA 94588
(650) 736-1270
What is Dr. Gahagan's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Gahagan's National Provider Identifier (NPI) number is 1558629493.
What common questions do patients ask about Dr. Gahagan?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Gahagan
What is Dr. John Gahagan's specialty?
Dr. Gahagan is a Surgeon near Pleasanton, CA. General surgeons are experts in diagnosing and managing surgical conditions which includes preoperative, operative, and postoperative care, as well as addressing complications. Their expertise include the areas such as the alimentary tract, breast, abdomen, skin and soft tissue, endocrine system, head and neck, pediatric surgery, surgical critical care, surgical oncology, trauma, burns, and vascular surgery. General surgeons increasingly utilize minimally invasive and endoscopic techniques to provide proper care. In addition to this, many general surgeons have expertise in transplantation, plastic, and cardiothoracic surgery. Contact Dr. Gahagan to book an appointment today.
Is this Dr. John Gahagan affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Gahagan is affiliated with Stanford Health Care - ValleyCare, Stanford Health Care - Stanford Hospital, Alta Bates Summit Medical Center - Summit Campus, Mills-Peninsula Medical Center, Memorial Hospital Los Banos, Carson Tahoe Regional Medical Center 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
Where can I learn more about Surgeon?
Explore Surgeon 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 Gahagan accepting new patients in Pleasanton, CA?
Yes, Dr. John Gahagan is accepting new patients at this time.
Does Dr. John Gahagan offer online booking?
Please contact Dr. Gahagan's office at (650) 736-1270 for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with John Gahagan?
Please contact Dr. Gahagan's office at (650) 736-1270 for information regarding telehealth appointment availability or for scheduling assistance.
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