Deciphering the Billing and Coding Gray Zone
Can you bill a prophy and localized scaling in the same mouth, or are you risking a claim denial?
Q
When I perform localized scaling and root planing on one to three teeth within a specific quadrant, may I also charge for a prophylaxis in the remaining quadrants?
A
Consulting the third-party payer guidelines or contacting the insurance provider is the best way to assure appropriate billing for services. The third-party payer reimbursement is determined by the dental benefit plan or participating provider contract. The dental benefit plan coverage determines the guidelines, policies, and exclusions for the specific plan. Ethical, legal, and safety considerations are important in providing care. Also, caring for the patient based on disease state and individual needs is paramount.
Updated annually, the Code on Dental Procedures and Nomenclature (CDT) provides a way to document patient services.1 CDT 4342 is described as periodontal scaling and root planing for one to three teeth per quadrant. This procedure involves instrumentation of the crown and root surfaces to remove plaque biofilm and calculus and root planing for cementum and dentin removal that is rough, permeated by calculus, or contaminated with toxins or microorganisms. Code D1110 is for removal of plaque biofilm, calculus, and stains from teeth and implants in the permanent and transitional dentition; as well as for controlling local irritational factors.1
Generally, scaling and root planing and oral prophylaxis should not be coded together on the same day for the same patient because each is a distinct procedure. Scaling and root planing and oral prophylaxis are designed for different disease states. Scaling and root planing is therapeutic in nature; bone loss and clinical attachment loss are present. Oral prophylaxis is preventive in nature for patients with no bone loss or clinical attachment loss.
One option is to provide the needed care in two appointments. In patients who need both scaling and root planing and oral prophylaxis, scaling and root planing can occur in the one quadrant during an appointment. If this appointment is an initial contact or recare, the scaling and root planing could be combined with health and assessment, care planning, patient education ,and informed consent. Then the patient can be rescheduled for oral prophylaxis. The most appropriate time for rescheduling would be 4 to 6 weeks post-scaling and root planing. At this time, care planning should include reevaluation of the quadrant where scaling and root planing was performed and oral prophylaxis. After treatment, consider periodontal maintenance for site-specific scaling and root planing at appropriate intervals.
Some insurers may permit billing of scaling and root planing and oral prophylaxis on the same day. Most likely thorough documentation, including a narrative, comprehensive periodontal charting, and appropriate radiographs, will be required. Also, documentation should include the location where the scaling and root planing and the oral prophylaxis occurred. For example, D4342 in the maxillary right quadrant on teeth #2-4. In the quadrant to be scaled and root planed (maxillary right) documentation should at least include bleeding on probing, bone loss on radiographs, and clinical attachment loss. No bone loss and healthy probing depths will be present in the other quadrants cared for with oral prophylaxis. Therefore, radiographs will reveal bone loss in the one quadrant treated with scaling and root planing and no bone loss in the other three quadrants. Patient-informed consent will include this care plan. The record of services (notes) will include the procedures, time spent on the procedures, and the patient’s conditions.
In similar situations, Code D4346 may be considered. This code is indicated for patients with generalized moderate to severe gingival inflammation with no loss of attachment when gingivitis is present and periodontitis (clinical attachment loss and bone loss) is not present. Refer to periodontal staging and grading for a complete review of disease states.
In conclusion, contacting the third-party payer is the best first step for the optimal outcome for both the patient and provider.
Reference
1. American Dental Association. Coding Education. Available at www.ada.org/publications/cdt/coding-education. Accessed June 2, 2026.
From Dimensions of Dental Hygiene. July/August 2026;24(4):46
