Caries

Caries, commonly known as tooth decay or cavities, is a multifactorial infectious disease process in which bacterial acids produced by cariogenic microorganisms, primarily Streptococcus mutans and Lactobacillus species, progressively demineralize and destroy the hard tissues of the tooth. The caries process begins when bacteria in dental plaque metabolize fermentable carbohydrates from the diet and produce organic acids that lower the pH at the tooth surface below the critical threshold for enamel dissolution. If this demineralization is not reversed by the remineralizing action of saliva, fluoride, and calcium phosphate, the process advances through the enamel into the dentin and eventually reaches the dental pulp, where it causes irreversible pulpitis or pulp necrosis. Caries can occur on any tooth surface but is most prevalent in areas where plaque accumulates, including pits and fissures, interproximal contact areas, and cervical margins along the gumline.

Caries risk assessment is an increasingly important component of dental practice, as it guides the frequency of diagnostic, preventive, and restorative interventions tailored to each patient's individual risk profile. Factors that increase caries risk include high frequency of sugar consumption, inadequate oral hygiene, reduced salivary flow, lack of fluoride exposure, and the presence of active carious lesions. The clinical management of caries ranges from non-invasive strategies for early enamel lesions, such as fluoride varnish application and dietary counseling, to operative intervention with direct or indirect restorations for cavitated lesions that have progressed beyond the point of remineralization. The shift toward minimally invasive caries management has emphasized early detection using visual-tactile examination, radiographic imaging, and adjunctive diagnostic technologies to identify lesions at the earliest possible stage.

In the revenue cycle, caries is the primary diagnosis that supports the majority of restorative procedure claims submitted by dental practices. Every restoration code requires corresponding documentation of the caries diagnosis, including the specific tooth, surface or surfaces involved, and the depth of the lesion as confirmed by clinical examination and radiographic imaging. Billing teams should verify that bitewing or periapical radiographs are on file to corroborate the caries diagnosis for each restoration claim, as payers routinely request radiographic evidence during post-payment audits. The number of surfaces affected by caries determines the CDT code and fee for the restoration, making accurate charting of involved surfaces critical to maximizing legitimate reimbursement while avoiding upcoding risk.