D4249 is the CDT code for clinical crown lengthening, hard tissue. It is a periodontal surgical procedure in which gingival tissue and alveolar bone are surgically repositioned to expose more of the clinical crown of a tooth. The hard tissue component sets it apart from soft-tissue gingivectomy. D4249 is billed per tooth and is most commonly performed before placing a crown on a tooth with inadequate supragingival structure.
Last updated June 2026 ยท Reviewed by the PracticeAlpha billing team
Get help with D4249 claims →A tooth requires a crown but does not have adequate supragingival tooth structure to support a proper margin. Subgingival decay, a fracture below the gumline, or a short clinical crown requires surgical exposure of additional tooth structure before the restorative work can proceed. Bone recontouring is performed to achieve biological width compliance.
When a fracture line or carious lesion extends below the bone crest, crown lengthening with osseous recontouring creates surgical access and moves the margin coronal to the bone level, allowing a restorative margin to be placed within acceptable biological width guidelines.
When the gingival margin has not fully migrated to its normal apical position during tooth eruption, resulting in excessive gingival display and short clinical crowns. Where bone is coronal to the cementoenamel junction and requires repositioning, D4249 applies. Hard tissue involvement is the key differentiator from a purely soft-tissue cosmetic reshaping.
Do NOT use D4249 for: Gingivectomy or gingivoplasty that involves only soft tissue removal with no osseous recontouring (use D4211 or D4210). Osseous surgery for periodontal disease treatment (use D4260). Procedures where the clinical record does not document osseous recontouring. Purely aesthetic soft-tissue gingival reshaping with no bone involvement.
When the clinical documentation does not include a clear restorative or functional justification, payers often classify D4249 as cosmetic and deny it. Crown lengthening performed solely to improve appearance without a planned restoration is typically not a covered benefit. The chart must link the procedure to a specific restorative need: tooth number, planned restoration, and the clinical reason why adequate crown structure is not available without surgery.
D4249 is for hard tissue crown lengthening. If only soft tissue was removed, D4210 or D4211 applies instead. A claim for D4249 submitted when the operative note describes only tissue excision without osseous recontouring is a coding error. The operative note must specifically state that alveolar bone was contoured or removed. Photographs and a periapical radiograph taken immediately after surgery can support this documentation.
Most plans treat D4249 as a surgical periodontal procedure requiring prior authorization. Without pre-auth, the claim may be denied or reimbursed at a reduced rate. When submitting a pre-auth request, include periapical radiographs of the affected tooth, probing depths, a brief narrative explaining why the crown cannot be placed without surgical intervention, and the intended restorative treatment plan.
Billing D4249 and the crown on the same date of service is a red flag. Crown lengthening is a preparatory surgical procedure. The crown is placed at a separate visit after an appropriate healing period. Submitting both on the same date implies the procedures were done simultaneously, which is clinically inaccurate and triggers denial or audit review.
Shows the bone level relative to the cementoenamel junction and the extent of subgingival decay or fracture. This is the primary radiographic justification for osseous recontouring. Include in both the pre-auth submission and the final claim.
Explicitly state that alveolar bone was contoured and the amount of tissue apically repositioned. Note the tooth number, the preoperative clinical crown height, the surgical technique, and the post-operative crown exposure achieved. This is the most critical element distinguishing D4249 from a soft-tissue-only procedure.
Document the planned restoration in the patient record before the surgery. Identify the specific tooth, the type of restoration intended (crown, build-up, etc.), and why the tooth cannot be restored without crown lengthening. The link between the surgical and restorative treatment is essential for demonstrating functional necessity.
Pre-operative photos showing subgingival margin, fracture line, or insufficient clinical crown height. Post-operative photos confirming the surgical result. Visual evidence is particularly persuasive in appeals when payers question the necessity of osseous involvement.
Submit the pre-auth before scheduling the surgery. Include the tooth number, diagnosis, planned restoration, radiographs, and a brief clinical narrative explaining why a crown cannot be placed without osseous recontouring. Reference the pre-auth number on the claim when submitted after surgery.
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Learn about our billing servicesD4249 is the CDT code for clinical crown lengthening, hard tissue. It is a periodontal surgical procedure in which gingival tissue and alveolar bone are surgically repositioned to expose more of the clinical crown of a tooth. It is billed per tooth. The procedure is most commonly performed before placing a crown on a tooth with insufficient supragingival tooth structure.
D4210 and D4211 are gingivectomy or gingivoplasty codes for soft tissue procedures. D4249 specifically involves osseous recontouring in addition to soft tissue management. If bone is surgically contoured to achieve adequate clinical crown exposure, D4249 applies. If only soft tissue is removed, D4210 or D4211 applies depending on tooth count per quadrant.
D4249 is billed per tooth. Each tooth on which clinical crown lengthening with osseous recontouring was performed receives its own D4249 line on the claim with the specific tooth number. This is different from codes like D4260 (osseous surgery) which are reported per quadrant.
Common reasons include: payer classifying the procedure as cosmetic due to insufficient restorative documentation; missing pre-authorization; no documentation of osseous recontouring (suggesting D4210 or D4211 should have been used); and billing D4249 on the same date as the restorative crown, which implies the procedures were done simultaneously.
Yes. After crown lengthening with osseous recontouring, tissue and bone must stabilize before the definitive restoration can be placed. The required healing period varies by case and clinician judgment. Placing the crown too soon risks gingival rebound that undermines the margin. The crown code should be submitted at the separate restorative visit after healing.
Generally no. Crown lengthening is a preparatory surgical procedure performed before crown placement. Submitting both on the same date of service is a red flag for payers and typically results in denial or audit review. Submit D4249 at the surgical visit and the crown code at the restorative visit after the required healing period.
Search all 206 CDT codes in our dental coding guide.