Placeholder Photo for Thao T. Marquez, MD

A colorectal surgeon in Missouri, Dr. Thao Marquez offers comprehensive care for intestinal diseases that affect the colon, rectum and intestines.


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Mercy Clinic Surgical Specialists LLC  


Please Note: This link will direct you to a third-party website unaffiliated with (, where you're able to request or schedule an appointment online with Dr. Thao Marquez.


(646) 933-8075


851 E 5th Street, Washington, MO 63090

Office Details

Doctor Specialties Colorectal Surgery & General Surgery
Practice Specialty Multi Specialty
Languages Spoken English

Mercy Clinic Surgical Specialists LLC  


(314) 251-7347


621 S New Ballas Road, 7011b, Saint Louis, MO 63141-8275

Office Details

Doctor Specialties Colorectal Surgery & General Surgery
Languages Spoken English

Insurance Accepted  

  • Medicare

About Dr. Marquez
Dr. Marquez



Dr. Thao Marquez graduated from University of Minnesota Medical School in 2004.

Dr. Marquez has two offices in Missouri where she specializes in Colorectal Surgery and General Surgery.

Dr. Marquez works with thirty-one doctors including Dr. Eugene Kennen and Dr. Lisa Martin Hawver.


Education & Training  

Medical School

Hospital Affiliations

  • Mercy Hospitals East Communities

Languages Spoken  

  • English

Dr. Marquez's Medicare Fee‑for‑Service Data (2014)  

Please Note: The information displayed below is sourced from the 2014 Medicare Physician and Other Supplier National Provider Identifier (NPI) Aggregate Report. It's important to remember that the statistics below are not inclusive of all patients treated by Dr. Marquez, but only those who participate in Medicare.

  • Participates in Medicare?: Yes 
  • Number of HCPCS Codes: 64 
  • Number of Services: 385 
  • Medical Suppress Indicator:  
  • Number of HCPCS Associated With Medical Services: 64 
  • Number of Medical Services: 385 
  • Number of Medicare Patients with Medical Services: 120 
  Medicare Patient Demographics
  • Total Number of Medicare Patients: 120 
  • Average Age of Medicare Patients: 71 
  • Number of Patients Under Age 65: 26 
  • Number of Patients Age 65 to 74: 42 
  • Number of Patients Age 75 to 84: 39 
  • Number of Patients Over Age 84: 13 
  • Number of Female Patients : 69 
  • Number of Male Patients: 51 
  • Number of Non-Hispanic White Patients: 109 
  • Number of Black or African American Patients: 11 
  • Number of Asian Pacific Islander Patients: 0 
  • Number of Hispanic Patients: 0 
  • Number of American Indian/Alaska Native Patients: 0 
  • Number of Patients with Race Not Elsewhere Classified: 0 
  • Number of Patients with Medicare Only Entitlement: 106 
  • Number of Patients with Medicare & Medicaid Entitlement: 14 
  Medicare Patient Condition Demographics
  • Percent of Patients with Atrial Fibrillation: 14% 
  • Percent of Patients with Alzheimer’s Disease or Dementia: 15% 
  • Percent of Patients with Asthma: 10% 
  • Percent of Patients with Cancer: 27% 
  • Percent of Patients with Heart Failure: 24% 
  • Percent of Patients with Chronic Kidney Disease: 41% 
  • Percent of Patients with Chronic Obstructive Pulmonary Disease: 20% 
  • Percent of Patients with Depression: 38% 
  • Percent of Patients with Diabetes: 33% 
  • Percent of Patients with Hyperlipidemia: 58% 
  • Percent of Patients with Hypertension (High Blood Pressure): 68% 
  • Percent of Patients with Ischemic Heart Disease: 38% 
  • Percent of Patients with Osteoporosis: 19% 
  • Percent of Patients with Rheumatoid Arthritis / Osteoarthritis: 35% 
  • Percent of Patients with Schizophrenia / Other Psychotic Disorders: 9% 
  • Percent of Patients with Stroke: 0% 
  Medicare Payments Data
  • Total Submitted Charge Amount: $162,546.60 
  • Total Medicare Allowed Amount: $77,065.08 
  • Total Medicare Payment Amount: $58,650.24 
  • Total Medicare Standardized Payment Amount: $60,404.13 
  • Total Medical Submitted Charge Amount: $162,546.60 
  • Total Medical Medicare Allowed Amount: $77,065.08 
  • Total Medical Medicare Payment Amount: $58,650.24 
  • Total Medical Medicare Standardized Payment Amount: $60,404.13 
  Medicare Prescription Drug Data
  • Drug Suppress Indicator: n/a 
  • Number of HCPCS Associated With Drug Services: 0 
  • Number of Drug Services: 0 
  • Number of Medicare Beneficiaries With Drug Services: 0 
  • Total Drug Submitted Charge Amount: $0.00 
  • Total Drug Medicare Allowed Amount: $0.00 
  • Total Drug Medicare Payment Amount: $0.00 
  • Total Drug Medicare Standardized Payment Amount: $0.00