Primary Dentition

Primary dentition, commonly referred to as baby teeth or deciduous teeth, is the initial set of 20 teeth that erupt during infancy and early childhood. The first primary teeth typically appear around six months of age, and the full set is usually in place by age three. The primary dentition consists of eight incisors, four canines, and eight molars distributed evenly between the upper and lower arches. These teeth serve critical functions including enabling proper nutrition through chewing, guiding speech development, and maintaining space for the permanent teeth that will eventually replace them. Primary teeth begin to exfoliate naturally around age six and are progressively replaced by permanent teeth through approximately age 12.

In dental billing, primary teeth are identified using letters A through T rather than the numbers 1 through 32 used for permanent teeth. This distinction is fundamental to clean claim submission. Payers use automated systems that cross-reference the tooth identifier with the patient's date of birth and the submitted procedure code. If a primary tooth letter is submitted for a patient whose age suggests they should have permanent teeth in that position, or if a permanent tooth CDT code is paired with a primary tooth letter, the claim will be flagged and denied. Certain procedures have separate CDT codes depending on whether they are performed on primary or permanent teeth. For example, stainless steel crowns, prefabricated resin crowns, and pulp therapy procedures all have distinct codes for primary versus permanent teeth.

The treatment philosophy for primary teeth also affects billing patterns and patient communication about costs. Because primary teeth will naturally be lost, the approach to restoring them balances the need to maintain function and space with the reality of their temporary nature. Payers generally cover less expensive restorative options for primary teeth, such as stainless steel crowns and amalgam or composite restorations, rather than the premium materials used on permanent teeth. Practices that treat pediatric patients must also be prepared to navigate Medicaid billing for primary tooth procedures, as many children in this age group are covered through state Medicaid programs that have specific guidelines for covered services, documentation requirements, and reimbursement rates for primary dentition treatments.