ICD-9-CM Vol. 1 Diagnostic Codes →
9. DISEASES OF THE DIGESTIVE SYSTEM (520-579) →
section notes
DISEASES OF ESOPHAGUS, STOMACH, AND DUODENUM (530-539) →
section notes
531 Gastric ulcer →
section notes
531.1 Acute gastric ulcer; with perforation →
section notes
531.10   Ac stomach ulcer w perf
531.11   Ac stom ulc w perf-obst
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