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Table 2 Accuracy of co-diagnosis codes to exclude hypoglycemia for ICD-9-CM code 250.8

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

ICD-9-CM code* n (%) Valid exclusion (%) PPV (95%CI)
681.xx (cellulitis fingers/toes) 9 (4) 9 (5) 100%
682.xx (other cellulitis) 86 (43) 78 (41) 91% (83–96)
686.90 (local skin infection) 6 (3) 6 (3) 100%
707.xx (ulcers of lower limb) 92 (46) 90 (47) 98% (94–100)
730.27 (osteomyelitis ankle/foot) 2 (1) 2 (1) 100%
731.8 (other osteomyelitis) 6 (3) 6 (3) 100%
Total 201 191 95% (91–98)
  1. ICD-9-CM – International Classification of Diseases, Ninth Revision; n – number; CI – confidence interval; PPV – positive predictive value.
  2. * No observations for 259.8 (secondary diabetic glycogenosis), 272.7 (diabetic lipidosis), or 709.3 (Oppenheim-Urbach syndrome)