Abnormal serum enzyme levels (R74)

The ICD-10 code R74 covers various abnormal serum enzyme levels detected in blood tests, used to classify findings without a specific diagnosis. These codes help identify elevated or abnormal enzyme activity related to liver function, muscle injury, and other organ systems.

R74.0 is for nonspecific elevation of transaminase enzymes and lactic acid dehydrogenase (LDH), common markers for tissue damage. More specific codes like R74.01 indicate elevated liver transaminase levels, often referenced as aspartate transaminase or alanine aminotransferase outside their normal ranges. R74.02 is assigned when only lactic acid dehydrogenase levels are elevated. The code R74.8 applies to abnormal levels of other serum enzymes, covering a broad set of enzymes such as creatine kinase, alkaline phosphatase, amylase, and gamma-glutamyl transferase. Finally, R74.9 captures unspecified abnormal serum enzyme findings, referred to generally as a high enzyme level in serum. These codes are essential for accurately recording abnormal lab results that require further clinical correlation.