John D. Cook • 7/14/2026

ICD-10 chapters and code letters

This article discusses the ICD-10-CM standard, detailing how its 21 chapters correspond to the first letters of codes. It notes that chapters can span multiple letters and that codes starting with 'D' may belong to two chapters. A diagram illustrates the relationship, and it mentions that 'U' is reserved for special codes. The content is technical and related to healthcare coding systems, which falls under IT/TECHNOLOGY due to its focus on data standards and coding structures.

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#regex #Icd 10 #Code Letters