Table 2: Agreement on top 20 frequently used diagnosis codes.

^*Sensitivity and PPV are calculated using the auditors' codes as the reference.

	# of records		Sensitivity*	PPV*
ICD-10 codes at three digits levels	Hospital	Audit	(95% CI)	(95% CI)
Symptom and sign:
R07: Pain in throat and chest	61	66	0.92 (0.83, 0.97)	1.00 (0.94, 1.00)
R10: Abdominal and pelvic pain	84	84	0.95 (0.88, 0.99)	0.95 (0.88, 0.99)
R11: Nausea and vomiting	26	27	0.93 (0.76, 0.99)	0.96 (0.80, 1.00)
R50: Fever of unknown origin	22	22	0.95 (0.77, 1.00)	0.95 (0.77, 1.00)
R51: Headache	15	15	0.93 (0.68, 1.00)	0.93 (0.68, 1.00)
Disease of the respiratory system:
J02: Acute pharyngitis	24	24	1.00 (0.86, 1.00)	1.00 (0.86, 1.00)
J05: Acute obstructive laryngitis (croup) and epiglottitis	31	30	1.00 (0.88, 1.00)	0.97 (0.83, 1.00)
J06: Acute upper respiratory infections of multiple and unspecified sites	34	36	0.89 (0.74, 0.97)	0.94 (0.80, 0.99)
J18: Pneumonia, organism unspecified	20	17	0.88 (0.64, 0.99)	0.75 (0.51, 0.91)
J45: Asthma	22	21	1.00 (0.84, 1.00)	0.95 (0.77, 1.00)
Infectious and parasitic diseases:
A09: Diarrhea and gastroenteritis of presumed infectious origin	33	31	0.97 (0.83, 1.00)	0.91 (0.76, 0.98)
B34: Viral infection of unspecified site	25	27	0.93 (0.76, 0.99)	1.00 (0.86, 1.00)
Injury, poisoning and other sequence of external causes:
S01: Open wound of head	15	17	0.82 (0.57, 0.96)	0.93 (0.68, 1.00)
S61: Open wound of wrist and hand	24	23	0.96 (0.78, 1.00)	0.92 (0.73, 0.99)
S82: Fracture of lower leg, including ankle	15	15	0.87 (0.60, 0.98)	0.87 (0.60, 0.98)
S93: Dislocation, sprain and strain of joints and ligaments at ankle and foot level	15	16	0.94 (0.70, 1.00)	1.00 (0.78, 1.00)
Other Problems:
F10: Use of alcohol	36	34	0.91 (0.76, 0.98)	0.86 (0.71, 0.95)
M54: Dorsalgia	31	34	0.85 (0.69, 0.95)	0.94 (0.79, 0.99)
N39: other disorder of urinary system, including urinary tract infection (unspecified site)	30	32	0.94 (0.79, 0.99)	1.00 (0.88, 1.00)
L03: Cellulitis	19	17	1.00 (0.80, 1.00)	0.89 (0.67, 0.99)