ICD-9-CM Vol. 1 Diagnostic Codes →
9. DISEASES OF THE DIGESTIVE SYSTEM (520-579) →
section notes
APPENDICITIS (540-543) →
section notes
540 Acute appendicitis →
section notes
540.0   Ac append w peritonitis
540.1   Abscess of appendix
540.9   Acute appendicitis NOS
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