Table 1.

Top 30 ICPC-2-R RFE codes of first-visit patients who presented to the Department of Internal Medicine at the Ikeda City Hospital without a referral on Fridays between April 2012 and March 2016

Ranking	ICPC-2-R code	ICPC-2-R title	Number of cases	Percentage	Cumulative percentage
1	R05	Cough	88	11.5	11.5
2	A03	Fever	85	11.1	22.6
3	D02	Abdominal pain, epigastric	55	7.2	29.8
4	D06	Abdominal pain, localized, other	39	5.1	34.9
5	A91	Abnormal result investigation NOS	34	4.4	39.3
5	N01	Headache	34	4.4	43.8
7	D11	Diarrhea	26	3.4	47.2
8	N17	Vertigo/dizziness	23	3.0	50.2
9	A04	Weakness/tiredness general	19	2.5	52.7
10	R02	Shortness of breath/dyspnea	16	2.1	54.8
11	D08	Flatulence/gas/belching	15	2.0	56.7
12	D09	Nausea	13	1.7	58.4
12	L01	Neck symptom/complaint	13	1.7	60.1
12	R01	Pain, respiratory system	13	1.7	61.8
15	L02	Back symptom/complaint	12	1.6	63.4
15	U98	Abnormal urine test NOS	12	1.6	65.0
17	D01	Abdominal pain/cramps, general	11	1.4	66.4
17	R21	Throat symptom/complaint	11	1.4	67.8
19	A11	Chest pain NOS	10	1.3	69.2
19	K07	Swollen ankles/edema	10	1.3	70.5
21	K02	Pressure/tightness of heart	8	1.0	71.5
21	R07	Sneezing/nasal congestion	8	1.0	72.5
21	T81	Goiter	8	1.0	73.6
24	D12	Constipation	7	0.9	74.5
24	L03	Low back symptom/complaint	7	0.9	75.4
26	B84	Unexplained abnormal white cells	6	0.8	76.2
26	D03	Heartburn	6	0.8	77.0
26	D10	Vomiting	6	0.8	77.8
26	D78	Neoplasm of digestive system, benign/unspecified	6	0.8	78.6
26	K04	Palpitations/awareness of heart	6	0.8	79.3
26	K86	Hypertension, uncomplicated	6	0.8	80.1
26	T03	Loss of appetite	6	0.8	80.9
		Others	146	19.1	100.0
Total			765	100.0

Abbreviations: ICPC-2-R, International Classification of Primary Care, Revised Second edition; NOS, not otherwise specified; RFE, reason for encounter.