ICD-9-CM Vol. 1 Diagnostic Codes →
9. DISEASES OF THE DIGESTIVE SYSTEM (520-579) →
section notes
DISEASES OF ORAL CAVITY, SALIVARY GLANDS, AND JAWS (520-529) →
section notes
523 Gingival and periodontal diseases →
section notes
523.4 Chronic periodontitis →
section notes
523.40   Chronc periodontitis NOS
523.41   Chr periodontitis, local
523.42   Chron periodontitis,gen
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