| O99.51 | Diseases of the respiratory system complicating pregnancy | NON-BILLABLE CODE |
| O99.511 | Diseases of the respiratory system complicating pregnancy, first trimester | BILLABLE CODE |
| O99.512 | Diseases of the respiratory system complicating pregnancy, second trimester | BILLABLE CODE |
| O99.513 | Diseases of the respiratory system complicating pregnancy, third trimester | BILLABLE CODE |
| O99.519 | Diseases of the respiratory system complicating pregnancy, unspecified trimester | BILLABLE CODE |
| O99.52 | Diseases of the respiratory system complicating childbirth | BILLABLE CODE |
| O99.53 | Diseases of the respiratory system complicating the puerperium | BILLABLE CODE |
