Aetna Sialolithiasis Coverage & Policy Update

Coverage Criteria — Medical Necessity and Investigational Status

Medically necessary — Modalities considered medically necessary when criteria are met

Modalities considered medically necessary when criteria are met:

Medically necessary modalities: 1. Sialendoscopy (diagnostic or therapeutic) for management of chronic sialadenitis and sialolithiasis. Note: if sialendoscopy is performed in conjunction with another salivary duct/gland surgery, the sialendoscopy is considered inclusive/incidental to the primary procedure and will not be reimbursed separately. 2. Extracorporeal shock wave lithotripsy (ESWL) or intraductal laser lithotripsy when a simple transoral surgical approach is not possible (typically proximal or intraglandular stones) or when a transoral approach has failed. 3. Ultrasonography and high-resolution, non-contrast computed tomography (CT) for detection of nonpalpable stones in persons suspected of having sialolithiasis.

Experimental and investigational — Modalities considered experimental and investigational

Modalities considered experimental and investigational (insufficient evidence to establish effectiveness):

Experimental/Investigational modalities: Alpha-blockers for sialolithiasis; augmented reality concretion visualization; contrast-enhanced ultrasound (CE-US); elastography for evaluation of sialolithiasis; endoscopic pneumatic lithotripsy (alone or adjunctive to sialendoscopy); intraductal steroid irrigation as an adjunct to sialendoscopy for sialadenitis without sialoliths; MUC8 as a biomarker for salivary stone disease; sialodochoplasty (alone or adjunctive); single-photon emission computed tomography (SPECT) for salivary gland dysfunction; trans-cervical removal of intra-glandular submandibular stones; trans-oral submandibulotomy plus duct marsupialization; ultrasound-guided sialo-irrigation; ultrasound shear-wave elastography in the interventional sialendoscopy setting.

Listed as experimental/investigational due to limited or preliminary evidence; well-designed studies are needed.

Interventional sialoendoscopy and lithotripsy — applicability

Covered when procedures match clinical indications and stone/anatomic characteristics reported as effectively managed in prior studies:

Core indications: Obstructive salivary gland disease (sialolithiasis, ductal strictures, mucous plugs) producing symptoms or functional impairment and documented by diagnostic imaging or direct endoscopic visualization indicating a lesion amenable to intervention.

Supported by multiple case series reporting high duct navigation and symptomatic relief after interventional sialoendoscopy.

Approach by stone characteristics: - Stones ≤ 4 mm: endoscopic retrieval often successful. - Stones > 4 mm and ≤ 7 mm: consider extracorporeal shock wave lithotripsy (ESWL) or endoscopic fragmentation (laser). - Stones > 7 mm, intraglandular, or proximal/hilar stones: combined endoscopic/open or external approaches (transoral/transcervical) may be required.stone size ranges

Stone-size guidance derived from institutional series and UpToDate review; larger stones often require fragmentation or combined approaches.

Imaging and diagnostic criteria

Diagnostic imaging and evaluation — typical pathway and performance characteristics:

Initial imaging pathway: Begin with ultrasonography (with or without color Doppler) as the first-line imaging test; ultrasound detects the majority of stones and is typically supplemented by sialendoscopy. When ultrasound is inconclusive or stones are suspected but not palpable, obtain high-resolution non-contrast CT. MR-sialography may be used complementaryy to visualize ducts when indicated.

Reported ultrasound sensitivity and accuracy vary by study; CT generally has higher sensitivity for sialolithiasis.

Therapeutic procedures and outcomes

Minimally invasive treatment indications and expected outcomes (observational evidence):

Endoscopic intraductal pneumatic lithotripsy (StoneBreaker): Endoscopically guided intraductal pneumatic lithotripsy has reported high complete fragmentation and stone-free rates (complete fragmentation ~97.7% in retrospective cohorts) with symptom resolution and gland preservation.

Evidence level IV; small retrospective series.

Multimodal therapy (ESWL + intraductal lithotripsy): Combined extracorporeal shock wave lithotripsy followed by intraductal pneumatic lithotripsy converted many previously untreatable stones into endoscopically removable cases, achieving overall stone-free and symptom-free rates >90% in reported cohorts; multiple procedures are often required.

Reported in retrospective series; may require several ESWL and IPL sessions.

Transoral sialolithotomy: Transoral removal of distal/hilar submandibular stones (transoral sialolithotomy) is effective, preserves the gland, and avoids submandibulectomy in many cases; very large stones (>10 mm) may be associated with saccular dilatation and can require tailored approaches.

Sialadenitis (no stones) — sialendoscopy with steroids

Interventional sialendoscopy with intraductal steroid irrigation — for inflammatory sialadenitis without stones:

Sialadenitis without sialoliths: Interventional sialendoscopy with ductal dilation plus intraductal steroid irrigations has been reported to reduce episodes of glandular swelling and pain and to improve xerostomia and patient-reported symptom scores in small pilot and retrospective studies. Combination therapy (sialendoscopy plus steroid irrigations) showed greater improvement than sialendoscopy alone in one pilot study.

Findings are preliminary; larger randomized controlled trials are needed to confirm effectiveness and durability.

Evidence-based clinical considerations

Evidence summaries and clinical considerations (descriptive; no additional prescriptive coverage criteria):

Diagnostic performance and pathway: Ultrasound supplemented by sialendoscopy demonstrated high diagnostic accuracy in large retrospective cohorts (example: accuracy ~94.8%, sensitivity ~94.9% in a 2,052-patient series); when supplemented by sialendoscopy, the correct diagnosis was established in virtually all cases.

Large retrospective evidence supports ultrasound + sialendoscopy as an effective diagnostic pathway.

Endoscopic lithotripsy techniques: Laser-assisted lithotripsy (various lasers including holmium:YAG), pneumatic lithotripsy, and other intraductal fragmentation methods have reported variable success rates (LAS pooled mean success ~87.3%; pneumatic cohorts ~91.6% overall), with high gland-preservation rates; evidence is largely from retrospective series and systematic reviews of low-level studies.

Technique selection depends on stone size, location, and local expertise; higher-level trials are lacking.

Approaches for intractable/deep stones: Transoral submandibulotomy with duct marsupialization, transcutaneous mini-incisions, peri-auricular flaps, and transcervical approaches are described for deep/hilar or intraglandular stones when endoscopic approaches are not feasible. Appropriate technique selection and radiographic localization are important for success.

When sialendoscopy is performed at the same time as another salivary duct or gland surgical procedure, Aetna considers the sialendoscopy to be incidental/inclusive to the primary operation and it will not be reimbursed separately. This bundling note applies regardless of whether the endoscopy is diagnostic or therapeutic when done in conjunction with a separate salivary gland/duct surgery.

Available evidence for endoscopic intracorporeal laser lithotripsy is limited to small series and preliminary reports. Published series include small patient numbers and variable fragmentation success; well-designed larger studies, including randomized trials, are needed to establish the effectiveness and comparative benefit of endoscopic laser lithotripsy for salivary stones.

Single-photon emission computed tomography / CT (SPECT/CT) is not referenced in major UpToDate reviews on salivary gland stones or Sjogren’s syndrome and therefore its role as a management or diagnostic tool for salivary gland dysfunction remains investigational in the evidence cited.

Concretion visualization using augmented reality has been reported in single-center case reports and early experience but is described in the policy as a novel/experimental technique. The available report is preliminary and the authors note randomized controlled trials with longer follow-up are needed before this approach can be considered established.

Several novel or proposed techniques for salivary stone management are described in small case series or pilot reports, including augmented reality concretion visualization and ultrasound-guided sialo-irrigation. These techniques are promising but remain experimental in the cited literature and are not yet included in standard reviews; further comparative studies and larger cohorts are required to define their effectiveness and safety.

This Clinical Policy Bulletin summarizes Aetna’s policy positions and selected evidence regarding diagnosis and minimally invasive treatment of sialolithiasis. It is a general description of plan benefits and is not a contract, does not guarantee coverage or outcomes, and may be updated. Specific reimbursement and applicability depend on the policy criteria and coding guidance provided elsewhere in the bulletin.

Coding and Procedural Thresholds

Covered imaging CPT codesCPTCovered

70486	Computed tomography, maxillofacial area; without contrast material.
76536	Ultrasound, soft tissues of head and neck (eg, thyroid, parathyroid, parotid), real time with image documentation.

(Note)mixed

Extracorporeal shock wave lithotripsy, Intraductal laser lithotripsy - no specific CPT code listed in this policy.

CPT codes listed as not covered for indications in this CPBCPTNot Covered

42500	Plastic repair of salivary duct, sialodochoplasty; primary or simple
42505	Plastic repair of salivary duct, sialodochoplasty; secondary or complicated
76391	Magnetic resonance (eg, vibration) elastography
76982	Ultrasound elastography, two-dimensional shear wave (2D-SWE)
76983	Ultrasound elastography, point shear wave

(Note)mixed

MR Elastography (MRE), endoscopic intracorporeal laser lithotripsy, endoscopic pneumatic lithotripsy, SPECT, augmented reality concretion visualization, ultrasound-guided sialo-irrigation, and Mucin 8 biomarker are listed as not covered or investigational with no specific CPT codes.

Other CPT codes related to the CPBCPT

42330	Incision and drainage of salivary gland (sialolithotomy range start)
42340	Sialolithotomy (range end)
78230	Salivary gland imaging
78231	Salivary gland imaging; with serial images
78232	Salivary gland function study

(Range note)CPT

42330-42340

Sialolithotomy procedure code range as listed in the policy.

ICD-10 codes referencedICD-10

K11.20
K11.23
K11.5	Sialoadenitis [chronic]

(Note)ICD-10

K11.20-K11.23

ICD-10 code range referenced in policy for sialolithiasis-related diagnoses.

Stone size threshold for ESWL effectiveness

ESWL stone-size thresholdExtracorporeal shock wave lithotripsy is reported as effective for intraductal stones less than 7 mm

Evidence basisUpToDate review and series reporting greater effectiveness for stones <7 mm and noting decreased success with larger stones

Clinical implicationConsider ESWL for proximal/intraglandular stones when transoral approach not possible and stone diameter <7 mm

Stone size thresholds affecting approach

Endoscopic removal size limitEndoscopic (sialoendoscopic) removal generally limited to stones <4 mm without prior fragmentation

Provider Action Items, Authorization, and Documentation

Note

References and Supporting Literature

References: The policy is supported by peer-reviewed studies, systematic reviews, and UpToDate summaries that evaluate sialendoscopy, extracorporeal shock wave lithotripsy (ESWL), intraductal laser and pneumatic lithotripsy, ultrasound, CT, MR-sialography, and adjunctive diagnostic modalities. See the References section for the full citation list (including Ardekian et al. 2014; Atienza & Lopez-Cedrun 2015; UpToDate reviews by Fazio & Emerick; Capaccio et al. 2004, 2017; Koch et al. 2016, 2018; Papadaki et al. 2008; Thomas et al. 2017; Goncalves et al. 2018; Kim et al. 2018, and others). Providers should consult these references for details on study design, populations, outcomes, and limitations.

References supporting clinical statements and coverage determinations are provided in the References section and should be used to inform clinical decision-making and documentation.
Evidence includes randomized and nonrandomized studies, retrospective series, prospective cohorts, systematic reviews, and expert reviews; many studies are small or observational, and some modalities have limited high-quality evidence.

Documentation Required

Provider Responsibility and Documentation

Provider responsibility: CPBs summarize plan benefits and clinical guidance but do not replace clinical judgment. Providers remain responsible for making independent medical decisions and for documenting clinical indications, diagnostic findings, treatment rationale, and informed consent. The plan may deny coverage if documentation does not support medical necessity based on the policy criteria.

Background and Epidemiology

Sialolithiasis are non-neoplastic, calcium-rich salivary calculi that most commonly affect the submandibular gland (~80%). Clinical presentation ranges from asymptomatic stones discovered incidentally to recurrent painful swelling and infection, particularly related to eating. Distal duct stones are frequently amenable to simple transoral removal, while proximal or intraglandular stones may require extracorporeal shock wave lithotripsy, endoscopic fragmentation (laser), combined endoscopic/open approaches, or gland excision depending on stone size and location.

Definitions and Terminology

Sialolithiasis — definition

DefinitionNon-cancerous calcium-rich stones (salivary calculi or sialoliths) located in a salivary gland or duct

Common locationMost salivary stones affect the submandibular gland (~80% of cases)

Clinical presentationStones may be single or multiple and can cause pain and swelling, especially with eating

Sialendoscopy

TechniqueImage-guided endoscopic technique used for diagnosis and treatment of obstructive salivary gland disease (diagnostic or therapeutic)

Reimbursement noteWhen performed with another salivary duct/gland surgery, sialendoscopy is considered incidental and not reimbursed separately

Revision History and Policy Dates

2023-10-10reviewLatest

Policy last reviewed on 10/10/2023; literature references updated and evidence summaries maintained.

2005-10-04effective_date

Policy effective date established as 10/04/2005.

OpenPayer

Sialolithiasis (Salivary Stones)