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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)