CurrentBlue Cross Blue Shield - WisconsinPolicy 04-206

Clinical Crown Lengthening

Defines clinical indications, general coverage criteria, and coding guidance for clinical crown lengthening procedures for Blue Cross Blue Shield - Wisconsin dental benefits reviewers and providers.

Policy Summary

PayerBlue Cross Blue Shield - Wisconsin

PolicyClinical Crown Lengthening

Policy CodePolicy 04-206

Change TypeNo material change

Effective DateJan 1, 2024

Next Review Date

Key ActionSubmit a current (within 12 months), dated diagnostic pretreatment radiograph documenting less than 3 mm of sound natural tooth structure between the restorative margin and the alveolar crest.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

>= 4 wkshealing time before final restoration

< 3 mmradiographic threshold

12 moradiograph age

D4249, D4274CDT codes referenced

Clinical Indications and Exclusions

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Primary indications

Radiographic documentation: A current (within 12 months), dated, diagnostic, pretreatment radiograph documents less than three millimeters of sound natural tooth structure between the restorative margin and the alveolar crest.< 3 mm
Additional records may be requested if radiographic indications are not evident.
Healing time before final restoration: A minimum of 4 weeks of healing of bone and soft tissue must be allowed following the procedure prior to final restoration.>= 4 weeks
Surgical technique: Requires reflection of a full thickness flap and removal of osseous and gingival tissue with alteration of crown-root ratio; procedure is only appropriate when resulting crown-root ratio remains adequate.
If bone removal results in inadequate crown-root ratio, the procedure is not beneficial.
Teeth eligible: Applicable to natural teeth only; not for teeth with structural loss due to wear, erosion, attrition, abrasion, or abfraction.

Excluded, elective, or cosmetic uses

Not covered / elective / cosmetic: Procedures performed for cosmetic reasons, to correct altered passive eruption, to correct congenital or developmental defects (considered elective), or troughing of soft tissue to visualize margins do not meet criteria and are not benefited.

Troughing for crown preparation does not meet the CDT descriptor for D4249.

Inclusive coding and concurrent procedures

Inclusive procedures: When crown lengthening is performed in conjunction with osseous surgery for periodontal disease, it is considered inclusive with osseous surgery; D4274 performed with D4249 on the same date is inclusive; if crown lengthening is performed on the same date as a crown, D4249 is considered inclusive with the crown.

Clinical crown lengthening is not indicated to treat teeth that have lost structural tooth substance from non-restorative processes. Specifically, crown lengthening will not be considered for teeth with structural loss due to wear, erosion, attrition, abrasion, and abfraction. Additionally, crown lengthening must be performed in a periodontally healthy environment and is intended to expose sufficient sound tooth structure for restorative purposes rather than to correct structural loss from these pathologic processes.

Procedures performed for cosmetic reasons do not meet coverage criteria and are not benefited. Crown lengthening solely to correct altered passive eruption or to address congenital or developmental defects is considered elective and is not covered. Likewise, minor soft‑tissue troughing done as part of crown preparation or to visualize margins does not meet the CDT descriptor for D4249 and is not a covered indication.

Procedure Codes and Documentation Requirements

Included CDT codes and inclusivity notesCPT

D4249	Clinical crown lengthening - CDT descriptor referenced
D4274	Mesial/distal wedge procedure - referenced as inclusive when performed with D4249 on same date

Inclusivity notesmixed

D4274 with D4249	D4274 performed in conjunction with D4249 on same date is considered inclusive
D4249 with crown	If clinical crown lengthening is performed on same date as the crown, D4249 is considered inclusive with the crown
Osseous surgery inclusive	When performed in conjunction with osseous surgery for periodontal disease, crown lengthening is inclusive with osseous surgery

inv-07: Diagnostic radiograph age — acceptable diagnostic radiograph within 12 months

Acceptable radiograph ageCurrent diagnostic pretreatment radiograph within 12 months

Radiograph requirement detailDated, diagnostic, pretreatment radiograph must document less than 3 mm of sound natural tooth structure between the restorative margin and the alveolar crest

Additional recordsIf radiographic indications are not evident, additional patient records may be requested

inv-08: Sound tooth structure — requirement: < 3 millimeters between restorative margin and alveolar crest

Required residual tooth structureLess than 3 millimeters of sound natural tooth structure between the restorative margin and the alveolar crest

Teeth eligibilityApplies to natural teeth only; not for teeth with structural loss from wear, erosion, attrition, abrasion, or abfraction

Documentation standardMeasured/documented on a current (within 12 months) dated diagnostic pretreatment radiograph

Documentation, Prior Authorization, and Clinical Requirements

Prior Authorization

Prior authorization and radiograph requirement

A current (within 12 months), dated, diagnostic pretreatment radiograph must be submitted documenting < 3 mm of sound natural tooth structure between the restorative margin and the alveolar crest. Lack of this radiograph may affect coverage.

Required: diagnostic pretreatment radiograph dated within 12 months
Documentation must show < 3 mm of sound tooth structure from margin to alveolar crest

Documentation Required

Required records and periodontal documentation

Submit current clinical records; when radiographic indications are not evident additional records may be requested. Periodontal charting may be required and documentation of periodontal health must support the procedure.

Submit: clinical notes, charting, and any additional diagnostics as requested
Periodontal charting may be required to demonstrate a periodontally healthy environment

Denial Risk

Periodontal health and inclusivity

Clinical crown lengthening may only be performed in a periodontally healthy environment. Procedures performed to treat unhealthy periodontal tissues (e.g., gingivectomy, grafting, scaling and root planing, distal wedge) in the same quadrant on the same date of service are considered part of periodontal therapy and are not separately allowable as crown lengthening.

Crown lengthening is appropriate only when periodontal health is documented
Crown lengthening performed in conjunction with osseous surgery for periodontal disease is inclusive with the osseous surgery
If performed with other periodontal procedures in the same quadrant on the same date, those procedures are considered integral/inclusive

Note

Clinical technical and coverage considerations

Clinical crown lengthening requires reflection of a full-thickness flap with removal of hard (osseous) and soft (gingival) tissue and an alteration of crown-root ratio. Allow a minimum of 4 weeks healing before final restoration. Procedures for cosmetic reasons, to correct altered passive eruption, or to treat structural loss from wear/erosion/attrition/abrasion/abfraction are not benefited.

Minimum 4 weeks healing before final restoration
Not covered: crown lengthening for cosmetic reasons or to correct altered passive eruption
Not covered: treatment for teeth with structural loss due to wear, erosion, attrition, abrasion, or abfraction

Clinical Context

Clinical crown lengthening is performed in a periodontally healthy environment to expose sufficient tooth structure when little or no coronal tooth is available for restoration. The procedure requires reflection of a full‑thickness flap with removal of both soft (gingival) and hard (osseous) tissue and results in an altered crown‑root ratio; if bone removal produces an inadequate crown‑to‑root ratio, the procedure is not beneficial. A current (within 12 months) diagnostic pretreatment radiograph documenting less than 3 millimeters of sound natural tooth structure between the restorative margin and the alveolar crest is required, and a minimum of 4 weeks healing must be allowed prior to final restoration.

Standards and Accepted Practice

inv-16: Generally accepted standards of dental practice — standards from peer-reviewed literature, specialty societies, and recognized practitioners

Source of standardsBased on peer‑reviewed dental literature, specialty society recommendations, views of recognized practitioners, and other credible sources guiding appropriate dental services

Application to coverage determinationsPlan requires services meet generally accepted standards of dental care for benefit determinations and contractual requirements

Clinical contextClinical crown lengthening is performed in a periodontally healthy environment to expose sufficient tooth structure for restoration and requires full‑thickness flap reflection with osseous removal

LimitationsProcedure is not considered beneficial when resulting crown‑root ratio is inadequate or when performed for congenital/developmental defects or cosmetic reasons