When the reason for the encounter is to determine the extent of the malignancy, or for a procedure such as paracentesis or thoracentesis, the primary malignancy or appropriate metastatic site is designated as the first-listed diagnosis.

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When the reason for the encounter is to determine the extent of malignancy or for a specific procedure such as paracentesis or thoracentesis, the primary malignancy or the appropriate metastatic site is designated as the primary diagnosis. This is in accordance with the coding guidelines provided by ICD-10-CM.

When the Reason for the Encounter Is to Determine the Extent