Table 1

 Correct and incorrect coding summary

Principal diagnosis% of total coded (95% CI)E-code% of total coded (95% CI)
Correct157995 (93–96)123874 (72–76)
Correct to 4 digit level, 5th digit incorrect90 (0–1)1318 (7–9)
Correct to 3 digit level, 4th digit incorrect201 (1–2)573 (3–4)
Correct to group level, 2nd or 3rd digit incorrect262 (1–2)16810 (9–12)
Incorrect at group level362 (2–3)765 (4–6)
Total coded16701670