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Ascertainment of periodontitis (precise) A diagnosis code for periodontitis (ICD-9-CM: 523.0-523.5) [21, 24] At least two teeth with interproximal (between teeth) attachment loss ≥4 mm or at least two teeth with interproximal pocket depth ≥5 mm (guidelines of the CDC and the American Academy of Periodontology, CDC/AAP)[25] ................
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