Table 2 Inaccurate coding for principal diagnoses by diagnosis group
GroupDescriptionTotal1st, 2nd or 3rdcharacter incorrectIncorrect in anycharacter
SInjuries related to single body regions
    S00–S09Injuries to the head28415.9 (11.8 to 20.6)27.8 (22.7 to 33.4)
    S10–S19Injuries to the neck3432.4 (17.4 to 50.5)38.2 (22.2 to 56.4)
    S20–S29Injuries to the thorax4719.2 (9.1 to 33.3)25.5 (13.9 to 40.3)
    S30–S39Injuries to the abdomen, lower back, lumbar spine, and pelvis9619.8 (12.4 to 29.2)28.1 (19.4 to 38.2)
    S40–S49Injuries to the shoulder and upper arm927.6 (3.1 to 15.1)23.9 (15.6 to 33.9)
    S50–S59Injuries to the elbow and forearm1728.1 (4.5 to 13.3)28.5 (21.9 to 35.9)
    S60–S69Injuries to the wrist and hand20717.9 (12.9 to 23.8)30.9 (24.7 to 37.7)
    S70–S79Injuries to the hip and thigh14510.3 (5.9 to 16.5)19.3 (13.2 to 26.7)
    S80–S89Injuries to the knee and lower leg1745.2 (2.4 to 9.6)17.2 (11.9 to 23.7)
    S90–S99Injuries to the ankle and foot6616.7 (8.6 to 27.9)18.2 (9.8 to 29.6)
    Subtotal131713.4 (11.6 to 15.4)25.5 (23.2 to 28.0)
TInjuries to multiple or unspecified body regions as well as poisoning & certain other consequences of external causes
    T00–T07Injuries involving multiple body regions0
    T08–T14Injuries to unspecified part of trunk, limb, or body region7100.0 (59.0 to 100.0)*100.0 (59.0 to 100.0)*
    T15–T19Effects of foreign body entering through natural orifice2317.4 (5.0 to 38.8)34.8 (16.4 to 57.3)
    T20–T32Burns345.9 (0.7 to 19.7)20.6 (8.7 to 37.9)
    T33–T35Frostbite0
    T36–T50Poisoning by drugs, medicaments, and biological substances1289.4 (4.9 to 15.8)13.3 (7.9 to 20.4)
    T51–T65Toxic effects of substances chiefly non-medicinal as to source2334.8 (16.4 to 57.3)39.1 (19.7 to 61.5)
    T66–T78Other and unspecified effects of external causes2412.5 (2.7 to 32.4)20.8 (7.1 to 42.2)
    T79Certain early complications of trauma250.0 (1.3 to 98.7)50.0 (1.3 to 98.7)
    T80–T88Complications of surgical and medical care, not elsewhere specified18817.6 (12.4 to 23.8)34.0 (27.3 to 41.3)
    T89Other complications of trauma not elsewhere specified1100.0 (2.5 to 100.0)*100.0 (2.5 to 100.0)*
    T90–T98Sequelae of injuries, poisoning, and other consequences of external causes0
    Subtotal43016.5 (13.1 to 20.4)27.7 (23.5 to 32.2)
Total174714.2 (12.6 to 15.9)26.0 (24.0 to 28.2)
  • Values are % (95% CI).

  • *Because the estimate is 100%, the 97.5% one-sided CI is presented.