| D55 | Anemia due to enzyme disorders | NON-BILLABLE CODE |
| D55.0 | Anemia due to glucose-6-phosphate dehydrogenase [G6PD] deficiency | BILLABLE CODE |
| D55.1 | Anemia due to other disorders of glutathione metabolism | BILLABLE CODE |
| D55.2 | Anemia due to disorders of glycolytic enzymes | NON-BILLABLE CODE |
| D55.21 | Anemia due to pyruvate kinase deficiency | BILLABLE CODE |
| D55.29 | Anemia due to other disorders of glycolytic enzymes | BILLABLE CODE |
| D55.3 | Anemia due to disorders of nucleotide metabolism | BILLABLE CODE |
| D55.9 | Anemia due to enzyme disorder, unspecified | BILLABLE CODE |
