I found the following information in response to your question:
Acute coronary syndrome and unstable angina are both coded as ICD-9-CM code 411.1. When the principal diagnosis is acute coronary syndrome in a patient with established coronary artery disease, the coder must report coronary artery disease as a principal diagnosis with a secondary diagnosis of unstable angina to comply with the 2009 Official Guidelines for Coding and Reporting of Diagnoses for an inpatient claim.
To see the complete article, go to http://www.acphospitalist.org/archiv.../07/coding.htm
I hope this helps.
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