Table 2 Frequencies of ICD-9 chapters & specific diagnostic codes from the physician claims among persons who had a laboratory test for pertussis by case status
ICD 9 CHAPTER | ICD-9 CODES | CASE STATUS | |||
|---|---|---|---|---|---|
TP (%) | FP (%) | FN (%) | TN (%) | ||
I. Infectious and parasitic diseases | 001–139 | 872 (100) | 4563 (100) | 0 | 656 (4.3) |
033 (whooping cough) | 747 (86.0) | 0 | 0 | 21 (0.1) | |
033.0 (B. pertussis) | 0 | 3949 (87.0) | 0 | 0 | |
033.1 (B. parapertussis) | 12 (1.4) | 56 (1.3) | 0 | 0 | |
033.8 (Whooping cough, other specified organism) | 2 (0.2) | 34 (0.8) | 0 | 0 | |
033.9 (Whooping cough, other unspecified organism) | 111 (12.7) | 524 (11.4) | 0 | 2 (>0.1) | |
Other codes (001–032.9; 034–139) | 0 | 0 | 0 | 633 (4.2) | |
II. Neoplasms | 140–239 | 0 | 0 | 0 | 110 (0.7) |
III. Endocrine, nutritional and metabolic diseases and immunity disorders | 240–279 | 0 | 0 | 0 | 299 (2.0) |
IV. Diseases of blood and blood-forming organs | 280–289 | 0 | 0 | 0 | 38 (0.2) |
V. Mental disorders | 290–319 | 0 | 0 | 0 | 614 (4.0) |
VI. Diseases of the nervous system and sense organs | 320–389 | 0 | 0 | 0 | 1226 (8.0) |
VII. Diseases of the circulatory system | 390–459 | 0 | 0 | 0 | 255 (1.7) |
VIII. Diseases of the respiratory system | 460–519 | 0 | 0 | 1388 (100) | 3256 (21.4) |
460–466 (Acute respiratory infections) | 0 | 0 | 1061 (76.4) | 2550 (16.8) | |
470–479 (Other diseases of upper respiratory tract) | 0 | 0 | 41 (3.0) | 113 (0.7) | |
480–487 (Pneumonia and influenza) | 0 | 0 | 118 (8.5) | 139 (0.9) | |
490–496 (Chronic obstructive pulmonary disease and allied conditions) | 0 | 0 | 159 (11.5) | 412 (2.7) | |
500–508 (Pneumoconiosis and other lung diseases due to external agents) | 0 | 0 | 0 | 3 (>0.1) | |
510–519 (Other disease of respiratory system) | 0 | 0 | 9 (0.6) | 39 (0.2) | |
IX. Diseases of the digestive system | 520–579 | 0 | 0 | 0 | 374 (2.4) |
X. Diseases of the genitourinary system | 580–629 | 0 | 0 | 0 | 675 (4.4) |
XI. Complications of pregnancy, childbirth and the puerperium | 630–676 | 0 | 0 | 0 | 190 (1.2) |
XII. Diseases of the skin and subcutaneous tissue | 680–709 | 0 | 0 | 0 | 722 (4.7) |
XIII. Diseases of the musculoskeletal system and connective tissue | 710–739 | 0 | 0 | 0 | 1095 (7.2) |
XIV. Congenital anomalies | 740–759 | 0 | 0 | 0 | 221 (1.4) |
XV. Certain conditions originating in the perinatal period | 760–779 | 0 | 0 | 0 | 1951 (12.8) |
XVI. Symptoms, signs and ill-defined conditions | 780–799 | 0 | 0 | 0 | 2130 (14.0) |
XVII. Injury and poisoning | 800–999 | 0 | 0 | 0 | 1360 (9.0) |
Total | 872 | 4563 | 1388 | 15172 | |