ICD-10 Clinical Modification

International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) provided by the Centers for Medicare and Medicaid Services (CMS) and the National Center for Health Statistics (NCHS), for medical coding and reporting in the United States. The ICD-10-CM is a morbidity classification for classifying diagnoses and reason for visits in all American health care settings. The ICD-10-CM is based on the ICD-10, the statistical classification of disease published by the World Health Organization (WHO) which replaces ICD-9.

General rules for use of the guidelines. They are incorporated within the ICD-10-CM as instructional notes.

ICD-10-CM Diagnosis codes are to be used and reported at their highest number of digits available. They are composed of codes with 3, 4, 5, 6 or 7 digits. Three digits are used as the heading of a category of codes that may be further subdivided by the use of fourth and/or fifth digits (preceded by a decimal, i.e. A00.1 Cholera due to Vibrio cholerae 01, biovar eltor), which provides greater detail. A code is invalid if it has not been coded to the full number of characters required for that code, including the 7th character, if applicable.

Some codes require the use of a seventh character for codes in chapters M, O, R, S, T, V, W, X, Y. If there are fewer than six characters in the code (not counting the decimal point) the placeholder "x" is used to ensure that the seventh character is always in the seventh position. For example, "A" (for initial encounter) is in the seventh position in "S03.4xxA Sprain of jaw, initial encounter".

ICD-10-CM has two types of excludes notes.

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