| R83 | Abnormal findings in cerebrospinal fluid | NON-BILLABLE CODE |
| R83.0 | Abnormal level of enzymes in cerebrospinal fluid | BILLABLE CODE |
| R83.1 | Abnormal level of hormones in cerebrospinal fluid | BILLABLE CODE |
| R83.2 | Abnormal level of other drugs, medicaments and biological substances in cerebrospinal fluid | BILLABLE CODE |
| R83.3 | Abnormal level of substances chiefly nonmedicinal as to source in cerebrospinal fluid | BILLABLE CODE |
| R83.4 | Abnormal immunological findings in cerebrospinal fluid | BILLABLE CODE |
| R83.5 | Abnormal microbiological findings in cerebrospinal fluid | BILLABLE CODE |
| R83.6 | Abnormal cytological findings in cerebrospinal fluid | BILLABLE CODE |
| R83.9 | Unspecified abnormal finding in cerebrospinal fluid | BILLABLE CODE |
