ICD-10-CM > E00-E89 > E70-E88 > E77 E77 Disorders of glycoprotein metabolism Non-Billable/Non-Specific Codes E77.0Defects in post-translational modification of lysosomal enzymesE77.1Defects in glycoprotein degradationE77.8Other disorders of glycoprotein metabolismE77.9Disorder of glycoprotein metabolism, unspecified