Table 1.
High-risk conditions for influenza complications
| High-risk category and subcategory | ICD-9 codesa |
|---|---|
| Chronic cardiac disease | |
| Acute rheumatic fever | 391–392 |
| Chronic rheumatic heart disease | 393–398 |
| Hypertensive heart disease | 402, 404 |
| Ischemic heart disease | 410–414 |
| Diseases of pulmonary circulation | 416–417 |
| Other forms of heart disease | 421, 423–425, 427.1–427.5, 427.8, 428–429 |
| Atherosclerosis, polyarteritis nodosa | 440, 446 |
| Congenital anomalies | 745–747 |
| Surgical/device conditions | V42.1, V45.0, V45.81, V45.82 |
| Cardiovascular syphilis | 093 |
| Candidal endocarditis | 112.81 |
| Myocarditis caused by toxoplasmosis | 130.3 |
| Chronic pulmonary | |
| Other metabolic and immunity disorders | 277.0, 277.6 |
| COPD and allied conditions | 491–496 |
| Pneumoconioses/other lung diseases caused by external agents | 500–506, 507.0–507.1, 508 |
| Other diseases of respiratory system | 510, 513–517, 518.0–518.3, 519.0, 519.9 |
| Congenital anomalies | 748.4–748.6, 759.3 |
| Lung transplant | V42.6 |
| Tuberculosis | 011, 012 |
| Diseases due to other mycobacteria | 031.0 |
| Sarcoidosis | 135 |
| Chronic renal disease | |
| Hypertensive renal disease | 403 |
| Nephritis, nephrotic syndrome, and nephrosis | 581–583, 585–587, 588.0, 588.1 |
| Chronic pyelonephritis | 590.0 |
| Other specified disorders of kidney and ureter | 593.8 |
| Dialysis and transplant | V42.0, V45.1, V56 |
| Diabetes mellitus | |
| Diabetes mellitus | 250–251, 648.0 |
| Complications of diabetes | 357.2, 362.0, 362.11, 366.41 |
| Hemoglobinopathies | |
| Anemias | 282–284 |
| Immunosuppressive disorders | |
| HIV/Retroviral disease | 042–044, 079.5, V08 |
| Disorders involving immune mechanism | 279 |
| Diseases of blood and blood-forming organs | 288.0, 288.1, 288.2 |
| Polyarteritis nodosa | 446 |
| Diseases of musculoskeletal system and connective tissue | 710.0, 710.2, 710.4, 714 |
| Organ/tissue transplants | V42.0–V42.2, V42.6–V42.9 |
| Radiation/chemotherapy | V58.0, V58.1 |
| Malignancies | |
| No subcategory | 140–208 |
| Other metabolic and immunity disorders | |
| Disorders of adrenal glands | 255 |
| Other disorders | 270, 271, 277.2, 277.3, 277.5, 277.8 |
| Liver diseases | |
| Chronic liver disease and cirrhosis | 571 |
| Liver abscess and sequelae of chronic liver disease | 572.1–572.8 |
| Neurological/musculoskeletal | |
| Psychotic conditions | 290, 294.1 |
| Mental retardation | 318.1, 318.2 |
| Hereditary and degenerative diseases of CNS | 330–331, 333.0, 333.4–333.9, 334, 335 |
| Other disorders of CNS | 340, 341, 343, 344.0 |
| Disorders of peripheral nervous system | 358.0, 358.1, 359.1, 359.2 |
| Late effects of CVD | 438 |
| Chondrodystrophy | 756.4 |
a
ICD-9 codes are listed using the least number of digits possible. Trailing digits are dropped when all codes using these digits are included. For example, the code 255 represents all codes 255.XX. Likewise the code 507.0 represents all codes 507.0X.
CNS = central nervous system; COPD = chronic obstructive pulmonary disease; CVD = cardiovascular disease; HIV = human immunodeficiency virus; ICD-9 = International Classification of Diseases, Ninth Revision.