ICD 10 Study Guide: Chapter 3 Diseases of the Blood & Immune Mechanism

ICD-10-CM Chapter 3 covers codes D50 through D89 — organized into conditions affecting the blood, blood-forming organs, and the immune system. This chapter includes a wide range of disorders from common conditions such as iron deficiency anemia to rare inherited disorders like hemophilia and severe combined immunodeficiency (SCID).

The chapter is particularly important for the CPC® exam because many of these codes interact with codes from other chapters (neoplasms, pregnancy, chronic kidney disease) through "code first" and "use additional code" conventions.