| E77 | Disorders of glycoprotein metabolism | NON-BILLABLE CODE |
| E77.0 | Defects in post-translational modification of lysosomal enzymes | BILLABLE CODE |
| E77.1 | Defects in glycoprotein degradation | BILLABLE CODE |
| E77.8 | Other disorders of glycoprotein metabolism | BILLABLE CODE |
