Official coding guidelines

ICD-10-CM · FY2026 · April · Apr 1, 2026 – Sep 30, 2026

This is archived guidance for April 1 through September 30, 2026. For current encounters, read the FY2027 official guidelines, effective October 1, 2026 through September 30, 2027. Confirm the instructions in the current source before use.

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

CDC / NCHS · ICD-10-CMApr 1, 2026 – Sep 30, 2026

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