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
533 Peptic ulcer, site unspecified →
section notes
533.1 Peptic ulcer, site unspecified; Acute with perforation →
section notes
533.10   Ac peptic ulcer w perfor
533.11   Ac peptic ulc w perf-obs
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