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
521 Diseases of hard tissues of teeth
section notes
521.1 Excessive attrition (approximal wear) (occlusal wear)
section notes
521.10   Excessive attrition NOS
521.11   Excess attrition-enamel
521.12   Excess attrition-dentine
521.13   Excessive attrition-pulp
521.14   Excess attrition-local
521.15   Excess attrition-general
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