Study Model
Dental RCM Glossary
A plaster, stone, or digital 3D reproduction of a patient's dental arches used for diagnosis, treatment planning, and case documentation.
A study model is a physical or digital replica of a patient's teeth, gingiva, and alveolar ridges that allows the dentist to examine the dental anatomy outside the mouth. Traditional study models are created by taking an alginate or polyvinyl siloxane impression of the patient's arches and pouring the impression with dental stone or plaster. The resulting casts can be mounted on an articulator to simulate jaw movements and evaluate the patient's occlusion in detail. With the advancement of intraoral scanning technology, many practices now produce digital study models that offer the same diagnostic value with the added benefits of easy storage, electronic sharing with specialists and laboratories, and integration with CAD/CAM treatment planning software.
Study models serve multiple clinical purposes. In orthodontics, they are essential for measuring tooth size discrepancies, evaluating arch form, and classifying the malocclusion before initiating treatment. In prosthodontics, they guide the design of crowns, bridges, partial dentures, and full dentures by allowing the laboratory to visualize spatial relationships and opposing arch contacts. In oral surgery, they assist in planning orthognathic procedures by enabling the fabrication of surgical splints. Study models also serve as legal records that document the patient's pre-treatment condition, which can be valuable in cases where treatment outcomes are disputed.
For billing and collections teams, study models or diagnostic casts are reported under CDT code D0470. This code covers the fabrication and analysis of the models as a diagnostic service. While many insurance plans cover diagnostic casts when they are clinically indicated, some plans bundle this service into the thorough examination fee or deny it as a routine diagnostic tool. Practices should verify coverage before fabrication and include a clear rationale in the claim documentation, particularly when the models are being used to support a pre-authorization request for orthodontic treatment, full-mouth reconstruction, or implant-supported prosthetics. Retaining study models, whether physical or digital, for at least the duration of active treatment is also a sound risk management practice, as they serve as baseline records that can substantiate the appropriateness of the treatment rendered.
Why It Matters for Dental Practices
Study models support pre-authorization requests and serve as baseline documentation for complex treatment plans. Practices that include study models in their diagnostic workflow strengthen their clinical narratives and reduce the risk of claim denials for procedures requiring prior justification.
Example
An orthodontist takes alginate impressions of a new patient and pours study models to evaluate the malocclusion, measure arch length discrepancies, and develop a treatment plan. The diagnostic models are billed under CDT code D0470. The models are later submitted as supporting documentation with the pre-authorization request for complete orthodontic treatment.
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