ICD-10-CM > R00-R99 > R70-R79 > R74 R74 Abnormal serum enzyme levels Non-Billable/Non-Specific Codes R74.0Nonspecific elevation of levels of transaminase and lactic acid dehydrogenase [LDH]R74.01Elevation of levels of liver transaminase levelsR74.02Elevation of levels of lactic acid dehydrogenase [LDH]R74.8Abnormal levels of other serum enzymesR74.9Abnormal serum enzyme level, unspecified