The below referenced codes have been proven to be the most successful in receiving reimbursements:

Dental Code D0415 "bacterialogical study for determination of pathologic agents utilizing  a DNA test"

Medical Procedure Code 87797 "Infectious agent detection by nucleic acid (DNA), not otherwise specified, direct probe technique"

Diagnostic Code 523 Gingival and Periodontal Diseases
523.0: Acute Gingivitis
523.1: Chronic Gingivitis
523.2: Gingival Recession
523.3: Acute Periodontitis
523.4: Chronic Periodontitis