ICD-9-CM Vol. 1 Diagnostic Codes
9. DISEASES OF THE DIGESTIVE SYSTEM (520-579)
section notes
APPENDICITIS (540-543)
section notes
540.0540.9   540 Acute appendicitis
541541   541 Appendicitis, unqualified
542542   542 Other appendicitis
543.0543.9   543 Other diseases of appendix
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