CurrentBlue Cross Blue Shield - MainePolicy 04-206

Clinical Crown Lengthening

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This policy defines clinical indications, criteria, and coding guidance for clinical crown lengthening procedures for dental providers and claims reviewers under Blue Cross Blue Shield - Maine.

Policy Summary

PayerBlue Cross Blue Shield - Maine

PolicyClinical Crown Lengthening

Policy CodePolicy 04-206

Change TypeNo material changes

Effective Date01/01/2025

Last ReviewOct 25, 2024

Next Review Date

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

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

1required current diagnostic radiograph within 12 months

3 mmmax sound tooth structure to qualify (mm)

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CurrentBlue Cross Blue Shield - MainePolicy 04-206

Clinical Crown Lengthening

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Sign up for Blue Cross Blue Shield - Maine Policy 04-206 alerts

Get alerted when Policy 04-206 changes without checking for updates manually.

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This policy defines clinical indications, criteria, and coding guidance for clinical crown lengthening procedures for dental providers and claims reviewers under Blue Cross Blue Shield - Maine.

Policy Summary

PayerBlue Cross Blue Shield - Maine

PolicyClinical Crown Lengthening

Policy CodePolicy 04-206

Change TypeNo material changes

Effective Date01/01/2025

Last ReviewOct 25, 2024

Next Review Date

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

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

1required current diagnostic radiograph within 12 months

3 mmmax sound tooth structure to qualify (mm)

Coverage Criteria

inv-01: Appropriate / Covered Indications

Covered when ALL of the following are met:

Primary criteria

Periodontal environment: Procedure is performed in a healthy periodontal environment and will not be considered when performed in conjunction with any periodontal procedure that addresses treatment for unhealthy periodontal tissues within the same quadrant on the same date of service (e.g., gingivectomy, frenectomy, distal wedge reduction, grafting, scaling and root planing).
Periodontal charting may be required.
Surgical technique and prognosis: Requires reflection of a full-thickness flap with removal of hard (osseous) and soft (gingival) tissue and alters crown–root ratio; if resulting crown–root ratio is inadequate, the procedure is not beneficial due to compromised long-term prognosis.
Clinical crown lengthening is considered for natural teeth only.
Timing before restoration: A minimum of 4 weeks healing of bone and soft tissue must be allowed prior to final restoration.>= 4 weeks
Indications for tooth-level treatment: Considered when subgingival caries or tooth fracture require removal of soft and hard tissue to enable restoration.
Not indicated for congenital/developmental defects (elective) or for teeth with structural loss due to wear/erosion/attrition/abrasion/abfraction.

inv-02: Exclusions / Not Benefited

Not covered / excluded when ANY of the following apply:

Exclusion criteria: Performed for cosmetic reasons or for the purpose of correcting altered passive eruption.

Clinical crown lengthening performed for cosmetic purposes or to correct altered passive eruption is not benefited.

Exclusion criteria: Troughing of soft tissue as part of crown preparation, or to visualize or capture margins for impressions/scanning, does not meet the CDT descriptor for clinical crown lengthening.

Exclusion criteria: Performed in conjunction with periodontal procedures addressing unhealthy periodontal tissues in the same quadrant on the same date of service (these are considered integral or addressed separately).

Such concurrent periodontal procedures include, but are not limited to, gingivectomy, frenectomy, distal wedge reduction, grafting, and scaling and root planing.

Exclusion criteria:

inv-03: Inclusive / Bundling Rules

Bundling and inclusivity rules:

Inclusive procedures: Clinical crown lengthening is inclusive with osseous surgery when performed in conjunction with osseous surgery for periodontal disease.

Inclusive procedures: Mesial/distal wedge procedures performed in conjunction with clinical crown lengthening on the same date of service are considered inclusive.

Inclusive procedures: Clinical crown lengthening performed on the same date of service as the crown procedure is considered inclusive (not separately payable).

Clinical crown lengthening is not covered when performed for purely cosmetic reasons or to correct altered passive eruption. The policy explicitly states that procedures performed for cosmetic reasons or for the purpose of correcting altered passive eruption are not benefited. Additionally, soft tissue "troughing" done solely to visualize or capture margins for impressions or scanning does not meet the CDT descriptor for clinical crown lengthening and therefore is not considered a covered service.

This procedure is also not appropriate for teeth with structural loss from non-restorative causes such as wear, erosion, attrition, abrasion, or abfraction. When a proposed crown lengthening would result in an inadequate crown-to-root ratio and compromise long-term prognosis, the procedure is likewise considered not beneficial.

Providers should note that clinical crown lengthening performed in conjunction with periodontal procedures that address unhealthy periodontal tissues in the same quadrant on the same date of service is not separately considered; such services are treated as inclusive or integral to the periodontal treatment and may affect payment/authorization.

Excluded indications include procedures performed for cosmetic purposes and those intended to correct altered passive eruption; the policy states these uses are not benefited. The policy also clarifies that routine "troughing" of soft tissue to aid crown preparation, impression taking, or scanning does not meet the descriptor for clinical crown lengthening and is excluded.

Clinical crown lengthening is not considered for teeth with structural loss due to wear, erosion, attrition, abrasion, or abfraction. When the resulting bone removal would produce an inadequate crown-root ratio and compromise prognosis, the procedure is not beneficial and should not be performed for coverage purposes.

When clinical crown lengthening is performed on the same date of service as a crown procedure, or when done in conjunction with osseous surgery for periodontal disease or with mesial/distal wedge procedures performed on the same date, those procedures are considered inclusive (not separately payable). Periodontal charting may be requested to document indications.

Coding and Billing

Included CDT Codes (informational)CDT

D4249

Clinical crown lengthening - hard tissue

inv-07: Sound tooth structure gap — < 3 mm between restorative margin and alveolar crest

Qualification thresholdLess than 3 mm of sound natural tooth structure between the restorative margin and the alveolar crest (documented by a current, dated diagnostic radiograph within 12 months)

Supporting requirementProcedure appropriate when proposed restoration margin would violate the periodontal attachment apparatus

DocumentationSubmit a current (within 12 months), dated, diagnostic pretreatment radiograph demonstrating the measurement

inv-08: Healing interval before final restoration — >= 4 weeks

Minimum healing interval>= 4 weeks between clinical crown lengthening and final restoration (minimum healing of bone and soft tissue)

Purpose

Provider Actions & Documentation

Prior Authorization

Prior Authorization / Coding Note

Prior authorization / coding note: Documentation and informational CDT code guidance. Submit current (within 12 months) dated diagnostic pretreatment radiograph showing < 3 mm sound tooth structure between the restorative margin and the alveolar crest when claiming clinical crown lengthening. Inclusion of CDT code D4249 is informational only; verify member benefits for coverage and reimbursement.

Submit dated pretreatment radiograph (<= 12 months) documenting < 3 mm sound natural tooth structure
CDT code D4249 (Clinical crown lengthening - hard tissue) included for informational purposes only

Denial Risk

Provider Action — Denial Risks

Provider action: Highlighted denial risks and required documentation the provider must supply to support medical necessity. Claims may be denied if the procedure is performed for cosmetic reasons, to correct altered passive eruption, or on teeth with structural loss (wear, erosion, attrition, abrasion, abfraction).

Background

Clinical crown lengthening is a surgical procedure that reshapes and/or removes alveolar bone and associated gingival tissue to expose additional tooth structure so a restorative margin will not violate the periodontal attachment. The procedure requires reflection of a full-thickness flap and removal of hard (osseous) and soft (gingival) tissue, producing an alteration in the tooth's crown-to-root ratio.

This intervention is intended to create sufficient sound tooth structure coronal to the alveolar crest to permit a restorative procedure when margins would otherwise impinge on the periodontal attachment. It must be performed in a healthy periodontal environment, and if bone removal would produce an inadequate crown-root ratio that compromises long-term prognosis, the procedure is not considered beneficial.

Definitions

inv-14: Clinical crown lengthening — procedure definition involving full thickness flap and bone removal

DefinitionProcedure involving reflection of a full-thickness flap and removal of osseous (hard) and gingival (soft) tissue to expose more tooth surface for restorative purposes

GoalIncrease amount of available tooth structure above the osseous crest to allow restorative procedures

Clinical environmentMust be performed in a healthy periodontal environment and results in alteration of the crown–root ratio