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ICD-9-CM presumes a cause-and-effect relationship between hypertension and chronic kidney disease.
If a physician documents that the patient's diabetes is poorly controlled, a fifth digit for out of control should be assigned.
When a patient is admitted for chemotherapy, assign the code for the malignancy as the first-listed diagnosis.
A fifth digit of 3 (in remission) should be assigned to 305.0X for someone who has abused alcohol in the past, but no longer drinks alcohol.
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