ICD-10-CM Code Directory
Browse the complete 2025 ICD-10-CM code set — 74,000+ diagnosis codes organized by chapter. Each code includes descriptions, clinical synonyms, SNOMED CT terms, and UMLS cross-references.
Chapter 1: Certain Infectious and Parasitic Diseases
22 code blocks
Chapter 2: Neoplasms
18 code blocks
Chapter 3: Diseases of the Blood and Blood-Forming Organs
7 code blocks
Chapter 4: Endocrine, Nutritional and Metabolic Diseases
10 code blocks
Chapter 5: Mental, Behavioral and Neurodevelopmental Disorders
11 code blocks
Chapter 6: Diseases of the Nervous System
11 code blocks
Chapter 7: Diseases of the Eye and Adnexa
12 code blocks
Chapter 8: Diseases of the Ear and Mastoid Process
5 code blocks
Chapter 9: Diseases of the Circulatory System
10 code blocks
Chapter 10: Diseases of the Respiratory System
11 code blocks
Chapter 11: Diseases of the Digestive System
10 code blocks
Chapter 12: Diseases of the Skin and Subcutaneous Tissue
9 code blocks
Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue
20 code blocks
Chapter 14: Diseases of the Genitourinary System
11 code blocks
Chapter 15: Pregnancy, Childbirth and the Puerperium
9 code blocks
Chapter 16: Certain Conditions Originating in the Perinatal Period
12 code blocks
Chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities
0 code blocks
Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings
14 code blocks
Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes
22 code blocks
Chapter 20: Codes for Special Purposes
2 code blocks
Chapter 21: External Causes of Morbidity
30 code blocks
Chapter 22: Factors Influencing Health Status and Contact With Health Services
15 code blocks
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