Decreasing incidence of peptic ulcer complications after the introduction of the proton pump inhibitors, a study of the Swedish population from 1974–2002

Table 2 Codes searched for in the national register

Ulcer complication	ICD 8 (-1986)	ICD 9 (1987–96)	ICD 10 (1997-)
Perforated gastric ulcer	53100, 53101	5311, 5312 5315, 5316	K251, K252 K255, K256
Perforated duodenal ulcer	53200	5321, 5322 5325, 5326	K261, K262 K265, K266
Other perforated ulcer	53300, 53400	5331, 5332 5335, 5336 5341, 5342 5345, 5346	K271, K272 K275, K276 K281, K282 K285, K286
Bleeding gastric ulcer	53190, 53193	5310, 5312 5314, 5316	K250, K252 K254, K256
Bleeding duodenal ulcer	53290	5320, 5322 5324, 5326	K260, K262 K264, K266
Other bleeding ulcer	53390, 53490	5330, 5332 5334, 5336 5340, 5342 5344, 5346	K270, K272 K274, K276 K280, K282 K284, K286