| Rank | Abbreviation | Meaning |
|---|
| ***** | ICD-9 | International Classification of Disease, 9th Edition
| |
| ***** | ICD-9 CM | International Classification of Diseases, 9th revision, Clinical Modification
| |
| **** | ICD-9 CM | International Classification of Diseases, Ninth Revision, Clinical Modification
| |
| **** | ICD-9 | International Classification of Disease, 9th Revision
| |
| **** | ICD-9 | International Classification of Diseases, 1975 Revision
| |
| *** | ICD-9 | International Classification of Diseases, 9th version
| |
| *** | ICD-9 | International Classification of Diseases, 9th edn
| |
| * | ICD-9 | International Classification of Diseases, Ninth Revision
| |
| * | ICD-9 | A method for coding diagnoses to receive reimbursement
| |
| * | ICD-9 | International Classification of Diseases Version 99
| |
| * | ICD-9 | International Classification Of Diseases
| |