Dr. Mark Sienko, MD

Dr. Mark Sienko, MD

Medical Oncology  ·  
Male  ·  
58 y/o

Accepting new patients

Dr. Mark Sienko, MD is a medical oncology specialist in Spokane, WA and has been practicing for 26 years. He specializes in medical oncology, hematology, and more.Read his story

Cancer Care Northwest

605 E Holland Ave Ste 100

Spokane, WA 99218
Get Directions

Insurance Accepted

  • Aetna
  • Assurant Health
  • Blue Cross Blue Shield
  • Cigna
  • Commercial Insurance Company
  • First Choice Health
  • First Health (Coventry Health Care)
  • Government Employees Health Association (GEHA)
  • Group Health Cooperative
  • HealthSmart
  • Humana
  • LifeWise
  • Medicaid
  • Molina Healthcare

Learn about Dr. Sienko

Be confident in your decisions by checking out your provider's top areas of care, education, patient reviews and more. Learn about finding the right doctor for you.

Top Care Areas

See how frequently Dr. Sienko performs your care needs compared to other doctors.

Blood Disorders
very high
more than 99% of peers
very high
more than 99% of peers
Breast Diseases
very high
more than 96% of peers

Dr. Sienko's percentages are based on the rate of treatment compared to peers nationwide from insurance data. Learn more info about our data and this Top Care Areas component.

Dr. Sienko's bio

This content was provided by Dr. Sienko "Since joining Cancer Care Northwest in 2006, Dr. Sienko has continued pursuing his special interest in treating colon and lung cancers."

4  Specialties

  • Medical Oncology
  • Hematology
  • Hematology & Oncology
  • Oncology

2  Board Certifications

  • Internal Medicine
    Accredited by: American Board of Internal Medicine*
  • Medical Oncology
    Accredited by: American Board of Internal Medicine*

85  Conditions Treated


Read Less

13  Procedures

  • Biological Therapy
  • Bone Marrow Aspiration
  • Bone Marrow Biopsy
  • Breast Cancer Treatment
  • Cancer Pain Management
  • Cancer Treatment
  • Chemotherapy
  • Genetic Testing
  • Hematologic Disorder Treatment
  • Intrathecal Chemotherapy
  • PET Scan
  • PET-CT Scan
  • Plasmapheresis

Background Check

Malpractice Claims not available

Healthgrades does not collect malpractice information for Washington.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • Northwestern University
    Undergraduate School | Graduated 1982
  • University Of Illinois College Of Medicine Chicago
    Medical School | Graduated 1989
  • St. Paul University
    Internship Hospital | Completed 1990
  • St. Paul University
    Residency Hospital | Completed 1992
  • University of Texas Southwestern Medical Center
    Fellowship Hospital | Completed 2005

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Sienko has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

Dr. Sienko does not have any memberships or affiliations listed. If you are Dr. Sienko and would like to add memberships or affiliations, please update your profile.

Dr. Sienko's Reviews

Likelihood of recommending Dr. Sienko to family and friends
8 total reviews (4 have comments)

Likelihood to Recommend (8)

  • 5
  • 4
  • 3
  • 2
  • 1

Dr. Sienko's Performance

  • Trustworthiness

  • Explains condition(s) well

  • Answers questions

  • Time well spent


Office & Staff Performance

  • Scheduling

  • Office environment

  • Staff friendliness

  • Average wait time

    16 to 30 minutes

Patient Comments (4)

worst dr. their ever was doesn't listen waited 2hr's to see. 3 patients scheduled at the same time. staff very slow and stupid. talk about their personal life while you stand their . outrageous!!!!!!!!!!!!!!!!!!!
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Dr Sienko was assigned my mom's case for ITP recently when she was admitted to the emergency room. His bedside manner was very rude and short. Seemed like he was in a hurry to leave and discredited all questions I had concerning my mother. He did not want to take any responsibility on questions...more
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Very personable. Explains complicated issues in simple terms. Takes the necessary time needed to make sure we understand what's important so we can make informed decisions.
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Dr. Sienko was my mother's Dr. When she was first diagnosed with a rare cancer. This Dr. Had a very poor bedside manner, he left us waiting at almost every visit and clearly had not reviewed her case until right before seeing her. He was rude, impatient with her questions, and discredited what...more
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