What is meant by "residual condition" in the context of ICD-10-CM coding?

In ICD-10-CM coding, a "residual condition" refers specifically to a condition that continues to exist after the initial injury or disease process has resolved. This implies that even though the acute phase of the condition has passed, there are lingering effects or complications that still affect the patient. For example, after a stroke or traumatic brain injury, a patient may experience residual effects such as weakness, speech difficulties, or cognitive impairments. These are considered residual conditions because they persist as a result of the original event.

This understanding is crucial for accurate coding, as it affects how healthcare providers document patient history and ongoing treatment needs. Properly identifying and coding residual conditions helps ensure that patients receive appropriate care and resources for ongoing recovery or management of these long-lasting effects.