Root Canal Therapy

Root canal therapy is performed when the dental pulp, the soft tissue inside the tooth containing nerves, blood vessels, and connective tissue, becomes irreversibly inflamed or necrotic due to deep decay, trauma, or repeated dental procedures. The treatment involves creating an access opening through the crown of the tooth, locating and cleaning each root canal using specialized endodontic files, irrigating the canals with antimicrobial solutions such as sodium hypochlorite, and shaping the canals to receive a permanent filling material. The canals are then dried and obturated, most commonly with gutta-percha and a sealer cement, to create a three-dimensional seal that prevents reinfection.

When handling billing and coding, root canal therapy is categorized by tooth type and canal complexity. CDT code D3310 covers anterior teeth (typically single-canal), D3320 covers premolars (one to two canals), and D3330 covers molars (three or more canals). Each code reflects increasing complexity and chair time, and reimbursement rates scale accordingly. Practices should be aware that some carriers may request pre-authorization for molar root canals, and submitting a periapical radiograph showing the periapical pathology along with a clear narrative of symptoms strengthens the approval process. Pulp vitality testing results should also be documented in the clinical record.

A completed root canal almost always requires a subsequent restoration, typically a core buildup and a full-coverage crown, to protect the now-brittle tooth from fracture. These restorative procedures are billed separately and usually at a different appointment. Practices benefit from presenting the full treatment plan, including the root canal, buildup, and crown, at the time of diagnosis so the patient understands the total investment. Failure to complete the crown in a timely manner is one of the leading causes of post-endodontic tooth fracture, which results in extraction and a lost opportunity for further restorative revenue. Tracking patients who have completed root canals but have not yet scheduled their crown appointments is a valuable revenue recovery strategy.