Development of a validation algorithm for 'present on admission' flagging

Table 3 Uncertainty* in condition-onset flagging eligibility by ICD-10 Chapter

Chapter	Code group		Frequency of codes with high uncertainty	N of codes in chapter	%
Chapter 1	AB	Infectious and parasitic disease	138	766	18.0
Chapter 2	C/D	Neoplasms	0	790	0.0
Chapter 3	part D	Anaemia & other blood diseases	30	164	18.3
Chapter 4	E	Endocrine	74	458	16.2
Chapter 5	F	Mental/behavioural	43	448	9.6
Chapter 6	G	Nervous system	66	387	17.1
Chapter 7/8	H	Eye & ear	36	372	9.7
Chapter 9	I	Circulatory system	23	396	5.8
Chapter 10	J	Respiratory system	4	233	1.7
Chapter 11	K	Digestive system	23	455	5.1
Chapter 12	L	Skin	58	348	16.7
Chapter 13	M	Musculoskeletal system	264	3361	7.9
Chapter 14	N	Genitourinary system	49	435	11.3
Chapter 15	O	Pregnancy & childbirth	60	436	13.8
Chapter 16	P	Perinatal	0	366	0.0
Chapter 17	Q	Congenital abnormalities	0	887	0.0
Chapter 18	R	Symptoms NEC	0	334	0.0
Chapter 19	ST	Injuries	64	1785	3.6
Chapter 20	U-Y	External causes of morbidity	275	2905	9.5
Chapter 21	Z	Factors influencing health status	16	684	2.3
Appendix A		Morphology of neoplasms	0	2408	0.0
		*Total*	*1223*	*18418*	*6.6*

*'Uncertainty' defined as <2 reviewers making a positive (valid) or negative (invalid) recommendation.

ISSN: 1472-6947