AHA Coding Clinic® for ICD-9 - 1995 Second Quarter

Clarification

Explanation of fifth digits for categories 433 and 434 The fifth-digits which were added to categories 433, Occlusion and stenosis of precerebral arteries, and 434, Occlusion of cerebral arteries, have been misunderstood by many coders. The rules governing the ICD-9-CM require that fifth-digits modify the fourth digit to which they are applied. They must follow a logical hierarchical structure. The fifth-digits "0" without mention of cerebral infarction, and "1" with cerebral infarction, apply only to the code to which they are assigned. For example, adding the fifth-digit "1" to code 433.1, Occlusion of carotid artery, indicates that there...

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