You will get many different answers to this, but I personally use 790.6. Here's what Faye Brown has to say:
Comments: The diagnostic statement represents a symptom followed by contrasting/comparative diagnoses (Section II[E]). The symptom is coded and sequenced first, followed by codes for the contrasting/comparative diagnoses. Code 790.6, Other abnormal blood chemistry, should be assigned for the abnormal liver function. It can be located in the index by looking up Findings, abnormal, liver function test. Code 794.8, Nonspecific abnormal results of function studies, liver, is not appropriate because it is intended for other types of tests (such as a liver scan) and not for blood tests for assessing liver function.
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