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Section I · FY 2027 Official Guidelines

Section I. Conventions, general coding guidelines and chapter specific guidelines

The conventions, general guidelines and chapter-specific guidelines are applicable to all health care settings unless otherwise indicated. The conventions and instructions of the classification take precedence over guidelines.

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027, published by CMS and NCHS (public domain). Underlining and italics in the PDF aren't reproduced here. Always consult the official PDF for the authoritative text.