790.92 is a billable ICD-9-CM medical code that can be used to specify a diagnosis on a reimbursement claim.
Diagnosis Definition(s)
An abnormal laboratory test result in which the partial thromboplastin time is found to be greater than the control value. As a possible indicator of coagulopathy, a prolonged partial thromboplastin time (PTT) may occur in a variety of diseases and disorders, both primary and related to treatment. --2004