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CHAPTER 2

AN OVERVIEW OF ICD-10-CM

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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…)

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The International Classification of Diseases, 10th Edition, Clinical Modification (ICD-10-CM) is designed for the classification of patient morbidity and mortality information for statistical purposes and for the indexing of health records by disease and operation for data storage and retrieval.

Index

Main terms and subterms

Figure 2.2

ICD-10-CM Index (From Elsevier: Buck’s 2022 ICD-10-CM for Hospitals, St. Louis, 2022, Elsevier.)

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I-10 Index is alphabetic, with the main terms in bold type and subterms indented under the main term.

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)

Chapter 22 Codes for Special Purposes (U00-U85)

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Tabular

Each section begins with unique letter and codes arranged in numerical order

ICD-10-CM Tabular, R codes. (From Elsevier: Buck’s 2022 ICD-10-CM for Hospitals, St. Louis, 2022, Elsevier.)

Figure 2.5

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All codes in a chapter begin with a letter.

Official Instructional Notations

Includes

Define or give examples of category content

Figure 2.13

Includes notation. (From Elsevier: Buck’s 2022 ICD-10-CM for Hospitals, St. Louis, 2022, Elsevier.)

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I-10 has instructional notations providing guidance to the coder.

Since the figures in this chapter are taken directly from Buck's ICD-10-CM for Hospitals, you may notice extra symbols and notations meant to enhance the user experience in addition to the official notations that are part of the ICD-10-CM release.

Excludes1

Excludes1 = Not Coded Here

Figure 2.14

Excludes1 notation in I-10. (From Elsevier: Buck’s 2022 ICD-10-CM for Hospitals, St. Louis, 2022, Elsevier.)

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What Excludes note is a pure excludes? (Excludes1)

Indicates the code excluded should not be assigned at the same time as the code above the Excludes1 note.

Excludes2

Excludes2 = Not Included Here

Figure 2.15

Excludes2 notation. (From Elsevier: Buck’s 2022 ICD-10-CM for Hospitals, St. Louis, 2022, Elsevier.)

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Excludes2 note indicates the condition excluded is not part of the condition it is excluded from and a patient may have both conditions at the same time.

When Excludes2 note appears under a code, acceptable to report code and the Excludes2 code together.

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 2022 ICD-10-CM for Hospitals, St. Louis, 2022, Elsevier.)

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I-10 has a coding conversion that requires the underlying condition to be sequenced first followed by the manifestation.

Code Also

Code Also = More than 1 code required

Figure 2.18

I-10 Tabular, Code also notation (From Elsevier: Buck’s 2022 ICD-10-CM for Hospitals, St. Louis, 2022, Elsevier.)

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Sequencing of the two codes depends on the following:

Severity of the condition.

Reason for the encounter.

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 2022 ICD-10-CM for Hospitals, St. Louis, 2022, Elsevier.)

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Placeholder X is assigned for all characters less than 6 that require a seventh character.

ConclusionCHAPTER 2

AN OVERVIEW OF ICD-10-CM

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