R743-char group

Abnormal serum enzyme levels

⇄ Primary-code rule changed vs QĐ4469

Coding rules (TT06)

●Avoid — more specific 4-5 char codes exist (see below)

Codes within R74

R74.0Elevation of levels of transaminase and lactic acid dehydrogenase [LDH]R74.8Abnormal levels of other serum enzymes R74.9Abnormal level of unspecified serum enzyme