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Table 1 Predictive value of ICD-9-CM codes for identification of hypoglycemia

From: Validation of ICD-9-CM coding algorithm for improved identification of hypoglycemia visits

ICD-9-CM Code n (%) Confirmed Cases (%) PPV (95%CI)
250.30 1 (0.2) 1 (0.2) 100%
250.8x 586 (86) 363 (83) 62% (58–66)
   Co-diagnoses absent* 385 (57) 353 (81) 92% (88–94)
251.10 3 (0.4) 2 (0.5) 67% (9–99)
251.20 64 (9) 56 (13) 88% (77–94)
775.60 1 (0.2) 1 (0.2) 100%
962.30 24 (4) 13 (3) 54% (32–74)
Algorithm+ 477 (70) 425 (97) 89% (86–92)
Total 679 436 64% (60–68)
  1. ICD-9-CM – International Classification of Diseases, Ninth Revision; n – number; CI – confidence interval; PPV – positive predictive value.
  2. * Co-diagnoses are: 259.8, 272.7, 681.xx, 682.xx, 686.9x, 707.xx, 709.3, 730.0–730.2, and 731.8.
  3. + Predictive value of proposed algorithm (see Figure 1)