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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (5)

The overall average patient rating of Dr. Mark Welton is Good. Dr. Welton has been reviewed by 10 patients who have provided 5 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.7
Promptness 4.2
Courteous Staff 4.2
Accurate Diagnosis 2.9
Bedside Manner 2.5
Spends Time with Me 2.7
Follows Up After Visit 2.1

Specialties & Research

Dr. Mark Welton, MD is board certified in Colon & Rectal Surgery.

  • He has special expertise in 13 areas:
  • Anal Cancer (Anus Neoplasms)
  • Anal Gland Cancer
  • Carcinoid Tumor
  • Carcinoma in Situ
  • Colonoscopy
  • Colorectal Cancer
  • Crohn's Disease
  • Gastrointestinal Cancer
  • Inflammatory Bowel Diseases (IBD)
  • Rectal Cancer
  • Squamous Cell Cancer
  • Squamous Cell Carcinoma
  • Ulcerative Colitis

Education & Awards

Dr. Welton graduated from University of California at Los Angeles. He has 6 awards.

One of America's Leading Experts on:
Anal Cancer (Anus Neoplasms)
Castle Connolly America's Top Doctors® (2006 - 2008, 2010 - 2015)
Castle Connolly America's Top Doctors® for Cancer (2005 - 2007, 2009 - 2012, 2014 - 2015)
Castle Connolly's Top Doctors™ (2012 - 2013)
Patients' Choice Award (2014)
On-Time Doctor Award (2014)


Dr. Welton has 6 hospital affiliations:

  • Stanford Hospital and Clinics 
  • UCSF Medical Center / Moffitt-Long Hospitals 


  • Spanish

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Additional Information
Dr. Mark Lane Welton MD is a male Colon/Rectal Surgeon, has 27 years of experience and practices in Colon & Rectal Surgery.
Where does Dr. Mark L. Welton practice?
Dr. Mark Welton has 1 office location.
Dr. Mark Welton practices Colon & Rectal Surgery near Palo Alto, CA.
See Palo Alto Colorectal Surgeons.