Table A1.
ICD-9 Conditions/Procedures Codes Used in This Study
| Disease/Condition | ICD-9-CM Diagnosis Codes/ Procedure Codes | Description |
|---|---|---|
| Diabetes | 250.xx | Diabetes mellitus |
| Herpes zoster (HZ) | 053.xx | HZ |
| Persistent post-zoster paina | 053.12 | Postherpetic trigeminal neuralgia |
| 053.13 | Postherpetic polyneuropathy | |
| 053.19 | Zoster with other nervous system complications | |
| 729.2x | Neuralgia, neuritis, or radiculitis | |
| Cancer | 140.xx-171.xx, 174.xx-208.xx | Malignant neoplasm except for other malignant neoplasm of skin (172.xx, 173.xx) |
| 99.25, 99.28 | Injection or infusion of cancer chemotherapeutic substance or biological response modifier as an antineoplastic agent | |
| Human immunodeficiency virus (HIV) | 042, 079.53, V08 | HIV |
| Solid-organ transplant | V42.0, 55.6x | Kidney transplant |
| V42.1, 33.6, 37.51 | Heart transplant | |
| V42.6, 33.5x, 33.6 | Lung transplant | |
| V42.7, 50.5x | Liver transplant | |
| Bone marrow or stem cell transplant | V42.81, V42.82, 41.0x | Bone marrow or stem cell transplant |
| Rheumatoid arthritis | 714.xx | Rheumatoid arthritis |
| Inflammatory bowel disease | 555.x | Regional enteritis |
| 556.x | Ulcerative colitis | |
| Lupus | 710 | Systemic lupus erythematosus |
| Multiple sclerosis (MS) | 340.x | MS |
| Psoriasis | 696.x | Psoriasis and similar disorders |
a Note: For the purpose of this study, persistent post-zoster pain was defined by any of the following 3 criteria: (1) a diagnosis of postherpetic trigeminal neuralgia or postherpetic polyneuropathy; (2) a diagnosis of HZ with other nervous system complications and more than a 30-day supply of medications typically used to treat post-zoster pain, as listed in Table A2; or a diagnosis of neuralgia, neuritis, or radiculitis (ICD-9-CM: 729.2) that first appeared after the HZ diagnosis.