Pediatric complex chronic conditions classification system version 2: updated for ICD-10 and complex medical technology dependence and transplantation

Table 1 Estimated comparability ratios for 10 categories of CCC v2 classified by underlying cause of death ICD-9 and ICD-10 codes in the CDC Multiple Cause of Death data for 1996

	Number allocated (N = 56,099)
CCC categories	ICD-9	ICD-10	Comparability ratio (95% CI)	pvalue
Neurologic and neuromuscular	2,466	2,337	0.9477 (0.8967–1.006)	0.0571
Cardiovascular	3,423	3,397	0.9924 (0.9478–1.0391)	0.7453
Respiratory	1,447	1,378	0.9523 (0.8854–1.0243)	0.1886
Renal and urologic	356	369	1.0364 (0.8965–1.1984)	0.6281
Gastrointestinal	173	177	1.0231 (0.8300–1.2612)	0.8304
Hematologic or immunologic	691	724	1.0476 (0.9447–1.1621)	0.774
Metabolic	274	273	0.9963 (0.8429–1.1777)	1.000
Other congenital or Genetic defect	2,095	2,061	0.9838 (0.9268–1.0443)	0.591
Malignancy	2,443	2,549	1.0437 (0.9883–1.1016)	0.1249
Premature and neonatal	949	995	1.0485 (0.9600–1.1451)	0.2926
Technology dependence	6	6	1.0000 (0.3225–3.1004)	1.000
Transplantation	0	0	---	---
CCC (Any CCC)	14,674	14,639	0.9976 (0.9782–1.0174)	0.8120

The comparability ratio for any CCC category (CR_c) is calculated as CR_c = D_c ^ICD-10/D_c ^ICD-9, where D_c ^ICD-10 is the number of deaths attributable to CCC category classified by ICD-10 and D_c ^ICD-9 is the number of deaths attributable to CCC category classified by ICD-9.

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