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Treatment directed at a secondary site
Official text from the FY2027 ICD-10-CM Official Guidelines for Coding and Reporting. The wording is quoted exactly.
Guidelines I.C.2.l.2
“the metastatic site(s) is designated as the principal/first-listed diagnosis. The primary malignancy is coded as an additional code.”
Where this applies
C77–C79C7B.-
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