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ICD-10-CM · FY2026 · Apr
ICD-10-CM · FY2027
Current
Apr 1, 2026 – Sep 30, 2026
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ICD-11
ICD-10-CM · FY2026 · April
/
Official coding guidelines
Official coding guidelines
ICD-10-CM · FY2026 · April · Apr 1, 2026 – Sep 30, 2026
Official English text · CDC/NCHS and CMS
ICD-10-CM Official Guidelines for Coding and Reporting
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Section I. Conventions, general coding guidelines and chapter specific guidelines
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A. Conventions for the ICD-10-CM
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B. General Coding Guidelines
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C. Chapter-Specific Coding Guidelines
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1. Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9
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2. Chapter 2: Neoplasms (C00-D49)
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3. Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)
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4. Chapter 4: Endocrine, Nutritional, and Metabolic Diseases (E00-E89)
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5. Chapter 5: Mental, Behavioral and Neurodevelopmental disorders (F01 – F99)
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6. Chapter 6: Diseases of the Nervous System (G00-G99)
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7. Chapter 7: Diseases of the Eye and Adnexa (H00-H59)
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8. Chapter 8: Diseases of the Ear and Mastoid Process (H60-H95)
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9. Chapter 9: Diseases of the Circulatory System (I00-I99)
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10. Chapter 10: Diseases of the Respiratory System (J00-J99), U07.0
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11. Chapter 11: Diseases of the Digestive System (K00-K95)
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12. Chapter 12: Diseases of the Skin and Subcutaneous Tissue (L00-L99)
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13. Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)
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14. Chapter 14: Diseases of Genitourinary System (N00-N99)
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15. Chapter 15: Pregnancy, Childbirth, and the Puerperium (O00-O9A)
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16. Chapter 16: Certain Conditions Originating in the Perinatal Period (P00-P96)
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17. Chapter 17: Congenital malformations, deformations, and chromosomal abnormalities (Q00-QA0)
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18. Chapter 18: Symptoms, signs, and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
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19. Chapter 19: Injury, poisoning, and certain other consequences of external causes (S00-T88)
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20. Chapter 20: External Causes of Morbidity (V00-Y99)
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21. Chapter 21: Factors influencing health status and contact with health services (Z00-Z99)
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22. Chapter 22: Codes for Special Purposes (U00-U85)
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Section II. Selection of Principal Diagnosis
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Section III. Reporting Additional Diagnoses
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Section IV. Diagnostic Coding and Reporting Guidelines for Outpatient Services
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Present on Admission Reporting Guidelines
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