AHA Coding Clinic® for ICD-9 - 1986 March - April; Coding Guidelines
Late Effects of Cerebrovascular Disease
Note: As of October 1, 1997, category 438 has been expanded to fourth and fifth digits to indicate specific types of late effects of cerebrovascular disease (e.g., aphasia (438.11), hemiplegia (438.2x), monoplegia (438.3x and 438.4x)). Category 438 is used to indicate conditions classifiable to categories 430-437 as the causes of late effects (neurologic deficits), themselves classified elsewhere. These "late effects" include neurologic deficits that persist after initial onset of conditions classifiable to 430-437. Unlike other late effects, the neurologic deficits caused by cerebrovascular disease are present from the onset rather than arising months later...
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