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Understanding ICD-10-CM: Classification System Overview

Learn about ICD-10-CM Classification System, used globally for morbidity and mortality coding, with detailed chapters from WHO. Includes index, chapters on diseases, conditions, and guidelines, with examples and notations for proper coding. Explore how to navigate the system and ensure continuity of data.

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Understanding ICD-10-CM: Classification System Overview

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  1. CHAPTER 2 AN OVERVIEW OF ICD-10-CM

  2. An Overview of the ICD-10-CM Classification System Morbidity (illness) Mortality (death) ICD = International Classification of Diseases WHO’s ICD-10 used globally World Health Organization ICD-10-CM = 10th Revision; CM, Clinical Modification Continuity of data (Cont’d…)

  3. Index Main terms and subterms Figure 2.2 ICD-10-CM Index(From Elsevier: Buck’s 2019 ICD-10-CM Hospital Edition, St. Louis, 2019, Elsevier.)

  4. ICD-10-CM Chapters Chapter 1 Certain Infectious and Parasitic Diseases (A00–B99) Chapter 2 Neoplasms (C00–D49) Chapter 3 Diseases of the Blood and Blood-Forming Organs and Certain Disorders Involving the Immune Mechanism (D50–D89) Chapter 4 Endocrine, Nutritional, and Metabolic Diseases (E00–E89) Chapter 5 Mental, Behavioral and Neurodevelopmental Disorders (F01–F99) Chapter 6 Diseases of the Nervous System (G00–G99) Chapter 7 Diseases of the Eye and Adnexa (H00-H59) Chapter 8 Diseases of the Ear and Mastoid Process (H60–H95) Chapter 9 Diseases of the Circulatory System (I00–I99) Chapter 10 Diseases of the Respiratory System (J00–J99) Chapter 11 Diseases of the Digestive System (K00–K95) • Chapter 12 Diseases of the Skin and Subcutaneous Tissue (L00–L99) • Chapter 13 Diseases of the Musculoskeletal System and Connective Tissue (M00–M99) • Chapter 14 Diseases of the Genitourinary System (N00–N99) • Chapter 15 Pregnancy, Childbirth, and the Puerperium (O00–O9A) • Chapter 16 Certain Conditions Originating in the Perinatal Period (P00–P96) • Chapter 17 Congenital Malformations, Deformations, and Chromosomal Abnormalities (Q00–Q99) • Chapter 18 Symptoms, Signs, and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00–R99) • Chapter 19 Injury, Poisoning, and Certain Other Consequences of External Causes (S00–T88) • Chapter 20 External Causes of Morbidity (V00–Y99) • Chapter 21 Factors Influencing Health Status and Contact with Health Services (Z00–Z99 )

  5. Tabular Each section begins with unique letter and codes arranged in numerical order Figure 2.5 ICD-10-CM Tabular, R codes.(From Elsevier: Buck’s 2019 ICD-10-CM Hospital Edition, St. Louis, 2019, Elsevier.)

  6. Official Instructional Notations Includes Define or give examples of category content Figure 2.13 Includes notation. (From Elsevier: Buck’s 2019 ICD-10-CM Hospital Edition, St. Louis, 2019, Elsevier.)

  7. Excludes1 Excludes1 = Not Coded Here Figure 2.14 Excludes1 notation in I-10. (From Elsevier: Buck’s 2019 ICD-10-CM Hospital Edition, St. Louis, 2019, Elsevier.)

  8. Excludes2 Excludes2 = Not Included Here Figure 2.15 Excludes2 notation. (From Elsevier: Buck’s 2019 ICD-10-CM Hospital Edition, St. Louis, 2019, Elsevier.)

  9. Code First/Use Additional Code Code First/Use Additional = Etiology/Manifestation Paired Codes Figure 2.16 I-10 Tabular, Code first notation. (From Elsevier: Buck’s 2019 ICD-10-CM Hospital Edition, St. Louis, 2019, Elsevier.)

  10. Code Also Code Also = More than 1 code required Figure 2.18 I-10 Tabular, Code also notation (From Elsevier: Buck’s 2019 ICD-10-CM Hospital Edition, St. Louis, 2019, Elsevier.)

  11. 7th Character and Placeholder X Codes <6 characters that have a 7th character requirement, X is placeholder Figure 2.20 X as the placeholder. (From Elsevier: Buck’s 2019 ICD-10-CM Hospital Edition, St. Louis, 2019, Elsevier.)

  12. GEMs Files (1 of 2) ICD-9-CM codes mapped to new ICD-10-CM codes Figure 2.21 GEMs mapping files I-9 to I-10 (Courtesy U.S. Department of Health and Human Services, Centers for Disease Control and Prevention.)

  13. GEMs Files (2 of 2) ICD-10-CM codes mapped to ICD-9-CM codes Figure 2.22 GEMS mapping files I-10 to I-9 (Courtesy U.S. Department of Health and Human Services, Centers for Disease Control and Prevention.)

  14. GEMs Flag (Column 3) Three types of flags Approximate Direct match from I-9 to I-10 Flags: 00000 and 10000 No Map No diagnosis code available Combination Requires a combination of codes to map from one system to another

  15. ConclusionCHAPTER 2 AN OVERVIEW OF ICD-10-CM

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