Aetna gastrointestinal manometry Coverage Update

Antroduodenal manometry — medically necessary indications

Covered when specific indications are met

Antroduodenal manometry is considered medically necessary for members with dyspepsia, gastroparesis, or chronic intestinal pseudo-obstruction who have unexplained upper gastrointestinal symptoms (eg, nausea, vomiting) when gastric emptying is normal or equivocal and severe symptoms persist despite empiric therapeutic trials of conservative management.

Requires prior testing of gastric emptying/electrogastrography and documentation of failed conservative therapy.

Anorectal manometry — medically necessary indications

Covered when evaluating anorectal function

Anorectal manometry and rectal sensation, tone, and compliance testing are considered medically necessary for evaluation of anorectal function, including assessment of chronic constipation and fecal incontinence.

Include rectal balloon testing and documentation of symptoms and prior evaluation (eg, digital rectal exam, failed conservative measures).

Colonic manometry — medically necessary indications (pediatrics)

Covered to guide surgical decision-making in pediatric refractory cases

Colonic manometry: Colonic motility studies (colonic manometry) are considered medically necessary to guide decision-making for surgery in children with refractory colonic motility or defecatory disorders when conservative therapy has failed.minimum 6 hours recording

Manometry should include prolonged recording (minimum 6 hours) and provocation testing as appropriate; testing is typically available at specialized centers to distinguish pathophysiologic subtypes and inform surgical planning.

Esophageal manometry — medically necessary indications

Covered for esophageal motility evaluation

High-resolution esophageal manometry is considered medically necessary for diagnosis of esophageal motility disorders in patients with dysphagia (including suspected achalasia, rumination syndrome, and PPI-refractory chest pain) and for preoperative evaluation prior to anti-reflux surgery.

Perform after endoscopy has ruled out structural or inflammatory lesions; use CPT codes for esophageal motility studies when criteria are met.

Covered with criteria (select cases)

Coverage considerations reflect limited evidence and specialized use:

Use for refractory or specialized cases: Colonic manometry or high-resolution colonic manometry may be considered in selected patients with refractory slow-transit constipation or complex pediatric defecation disorders when results would alter management (eg, guide surgical decision-making).

Available in select centers; evidence is limited and mainly observational (see supporting literature).

Prerequisites: Documentation of failed conservative management (medical therapy, biofeedback, transit studies) and correlation with clinical symptoms; testing performed at experienced centers; use of provocation testing (meal, waking, pharmacologic agents like bisacodyl) and assessment for high-amplitude propagated contractions (HAPCs) where relevant.

Selection and specialized center availability are emphasized in guideline and review statements.

Not routinely medically necessary

Not routinely covered / insufficient evidence

Routine use not supported: There is insufficient evidence that colonic manometry or electrogastrography improve outcomes in general populations with nausea, vomiting, or constipation; these tests are not appropriate for most patients and are generally limited to research settings or specialized centers.

Routine use for chronic constipation or as a first-line diagnostic test lacks evidence of added value and is considered not medically necessary outside of select refractory or pre-surgical contexts.

Indications for esophageal high-resolution (impedance) manometry

Coverage aligned with guideline-recommended indications

Esophageal manometry indication: Manometry is indicated for patients with dysphagia when endoscopy is unrevealing and an esophageal motility disorder is suspected; high-resolution manometry is preferred over conventional manometry.

Guidelines recommend HRM prior to antireflux surgery and as the preferred modality for characterizing motility disorders.

Use of HRIM: High-resolution impedance manometry (HRIM) may be used to add bolus transit/impedance information and assist classification of minor motility disorders (eg, ineffective esophageal motility) and to confirm rumination when clinically necessary.

HRIM with postprandial monitoring is recommended in specific scenarios by guideline statements.

Indications for anorectal and colonic manometry in pediatric Hirschsprung disease

Pediatric postoperative Hirschsprung disease evaluation

Anorectal manometry in post-op Hirschsprung: Anorectal manometry may be useful to identify pelvic dyssynergia in children with postoperative obstructive symptoms when there is no mechanical obstruction, rectal biopsy and other motility investigations are normal, and there has been no response to botulinum toxin.

ARM protocols and outcomes in this population are heterogeneous; use standardized protocols where possible.

Colonic manometry in post-op Hirschsprung: Colonic manometry is recommended if colonic motility studies are abnormal so that the location and nature of dysmotility can be more accurately determined to guide further management.minimum 6 hours recording

Evidence is limited and heterogeneous; testing is typically low-resolution in published pediatric series and should be interpreted by experienced teams.

Antroduodenal manometry, anorectal manometry, colonic motility studies, and high-resolution esophageal manometry are addressed by this policy. In particular, antroduodenal manometry is considered medically necessary for members with dyspepsia, gastroparesis, or chronic intestinal pseudo-obstruction who have unexplained upper gastrointestinal symptoms (for example, nausea or vomiting) when gastric emptying is normal or equivocal and severe symptoms persist despite empiric conservative management. Anorectal manometry (including rectal sensation, tone, and compliance testing) is medically necessary for evaluation of anorectal function (eg, chronic constipation, fecal incontinence). Colonic manometry is considered medically necessary to guide surgical decision-making in children with refractory colonic motility/defecatory disorders. High-resolution esophageal manometry is considered medically necessary for diagnosis of esophageal motility disorders in persons with dysphagia (including achalasia, rumination syndrome, or PPI-refractory chest pain) and for preoperative evaluation prior to anti-reflux surgery.

Colonic manometry is not appropriate for most patients and is generally limited to research settings or specialized centers; available clinical use is primarily in selected centers where results may inform management of refractory cases. UpToDate and guideline summaries note that, although colonic manometry provides detailed information about motor patterns and can categorize normal, myopathic, or neuropathic patterns, there is currently insufficient evidence that this information has added value for routine management of chronic constipation in general clinical practice.

Evidence for the routine use of high-resolution colonic manometry in the post-operative evaluation of children with Hirschsprung disease is limited and heterogeneous. Guidelines (American Pediatric Surgical Association) recommend colonic manometry when colonic motility studies are abnormal to better determine the location and nature of dysmotility, but systematic reviews highlight sparse, low-quality, and methodologically variable studies that limit broad conclusions about diagnostic performance and clinical impact.

Antroduodenal manometry can characterize fasting and postprandial motor patterns of the distal stomach and proximal small bowel, but its incremental clinical value is limited when standard tests of gastric function are abnormal. If gastric emptying studies or electrogastrography already demonstrate delayed emptying or abnormal myoelectrical activity, antroduodenal manometry generally does not provide additional actionable information and should be reserved for the specific indications listed in this policy.

Routine use of colonic manometry for evaluation of chronic constipation or as a first-line diagnostic test lacks evidence of added value. Reviews and guideline statements emphasize that the test is resource-intensive, available in only selected centers, and has not been shown in well-designed studies to improve management or outcomes for most patients; therefore its routine application is not supported.

Diagnosis of Ineffective Esophageal Motility (IEM) by high-resolution manometry relies on manometric thresholds (for example, distal contractile integral <450 mmHg·s·cm in ≥50% of ten liquid swallows), but manometric classification alone does not consistently correlate with symptom severity or impaired esophageal function. Studies and reviews note that many patients with IEM may have normal bolus transit or minimal symptoms, so manometric findings should be interpreted in the context of clinical presentation and additional diagnostic data before directing therapy.

Procedure and Diagnosis Codes

Covered CPT Codes (if selection criteria met)CPTCovered

91010	Esophageal motility (manometric study of the esophagus and/or gastroesophageal junction) study with interpretation and report.
+91013	with stimulation or perfusion (eg, stimulant, acid or alkali perfusion).
91117	Colon motility (manometric) study, minimum 6 hours continuous recording (including provocations tests, eg, meal, intracolonic balloon distension, pharmacologic agents, if performed), with interpretation and report.
91120	Rectal sensation, tone, and compliance test (ie, response to graded balloon distention).
91122	Anorectal manometry.
91020	Gastric motility (manometric studies).
43235	Esophagogastroduodenoscopy, flexible, transoral; diagnostic (when performed).

Example ICD-10 Codes (covered if selection criteria met)ICD-10

K21.00-K21.9	Gastro-esophageal reflux disease.
K22.4	Dyskinesia of esophagus.
K30	Functional dyspepsia.
K31.84	Gastroparesis.
K56.0-K56.7	Paralytic ileus and intestinal obstruction without hernia [includes chronic intestinal pseudo-obstruction].
K59.00-K59.09	Constipation.
K59.8	Other specified functional intestinal disorders.
R11.0-R11.2	Nausea and vomiting.
R15.0	Incomplete defecation.

Experimental / no specific codemixedExperimental

MRI capsule marker

Magnetic resonance imaging (MRI) capsule marker methods- no specific code.

No explicit codes in this excerptmixed

No codes listed

inv-19: Colonic manometry recording duration (minimum 6 hours)

Minimum recording durationColonic manometry requires a minimum of 6 hours continuous recording (CPT 91117).

Typical study durations in literatureProlonged/ambulatory recordings reported from 8-hour epochs up to 24-hour ambulatory monitoring in research and specialist centers.

Probe / sensor typesPerformed with water‑perfused multi‑sensor systems (eg, 6–8 sensors) or high‑resolution solid‑state catheters depending on center capabilities.

inv-20: Ct (contraction frequency) threshold for blunted wake response

Ct threshold for blunted wake responseCt (contraction frequency) threshold of 64 at 20‑minute post‑wake defines a blunted wake response (sensitivity 84%, specificity 32%).

Measurement windowCt analyzed in 20‑minute windows before and after awakening (20, 40, 60 minutes post‑wake compared with pre‑wake).

Clinical implicationBlunted wake response by this Ct cutoff was associated with slow‑transit constipation (STC) versus normal transit or healthy controls.

inv-21: IEM DCI threshold

IEM DCI thresholdIneffective esophageal motility (IEM) is defined as distal contractile integral (DCI) < 450 mmHg·s·cm in ≥50% of 10 liquid swallows on high‑resolution esophageal manometry.

Number of swallowsAssessment is based on 10 liquid swallows per standard HRM protocol used in cited studies.

Correlation with symptomsThe DCI‑based IEM classification may not reliably correlate with symptom severity in all cohorts; clinical correlation is required.

inv-22: IEM diagnostic thresholds and DCIIR1500 parameters

Primary manometric diagnostic thresholdIEM: distal contractile integral < 450 mmHg·s·cm in ≥50% of ten liquid swallows (Chicago Classification / HRM standard).

DCIIR1500 proposed cut‑offsDCIIR1500 < 0.008 mmHg/Ω predictive of IEM; a cut‑off of 0.002 mmHg/Ω differentiated IEM subtypes (IEM‑alternans vs IEM‑persistens) in multivariate analysis.

Supporting impedance metricsRelated impedance metrics (EII, EII ratio, EII1500) were lower in IEM and may aid diagnosis, but DCIIR1500 remained significant in multivariate analysis.

Provider Requirements, Prior Authorization, and Documentation

Prior Authorization

Prior Authorization / Coverage‑Linked Codes

Prior authorization is required for gastrointestinal manometry procedures when coverage is linked to medical necessity criteria. Include relevant CPT/ICD-10 codes and documentation with the prior authorization request.

Prior authorization required when selection criteria must be met.
Attach applicable procedure and diagnosis codes with request.

Prior Authorization

Prior Authorization for Specialized Motility Testing

Specialized motility testing (eg, antroduodenal manometry, prolonged or pediatric colonic manometry, high‑resolution esophageal manometry) requires prior authorization when used to establish diagnosis or to guide management or surgery. Requests should state the specific motility test, indication, and prior test results.

Specify test type (eg, antroduodenal, colonic, anorectal, high‑resolution esophageal).
Provide clinical indication and prior work‑up results (see Required Clinical Documentation callout).

Prior Authorization

Prior Authorization Requirement (Follow Clinical Policy Bulletin Procedures)

Prior authorization must follow the Clinical Policy Bulletin procedures; absence of authorization or supporting documentation may result in denial. Providers should use payer prior authorization portals or contact the plan per standard procedures.

Follow Aetna/CPB prior authorization process.
Lack of required documentation or authorization increases denial risk.

Denial Risk

Experimental / Investigational Triggers Denial

The policy designates certain procedures as experimental/investigational for indications not listed as medically necessary. Requests for these indications will be denied.

Antroduodenal manometry not covered for indications outside listed medically necessary uses.
Colonic motility studies not covered for indications outside listed medically necessary uses.
MRI capsule marker methods for whole gut transit are investigational.

Denial Risk

Guideline‑Based Limitation Risk

Some services are limited by guideline recommendations and consensus statements (eg, use of colonic manometry primarily in specialized centers, HRM preferred over conventional manometry). Requests inconsistent with guideline‑based limitations may be denied or require additional justification.

Colonic manometry generally limited to selected/refractory patients or research/specialty centers.
High‑resolution esophageal manometry preferred over conventional for many indications.
Guideline-based limits may require additional documentation of necessity.

Note

Policy History and Review Dates Noted

Policy history and review dates: Effective date, last review, and next scheduled review are documented in the policy. Include these if relevant to administrative review.

Effective: 05/14/2002
Last Review: 09/11/2023
Next Review: 07/11/2024

Billing Rule

Codes to Include with Documentation

Include the following codes with documentation when submitting prior authorization or claims: covered CPT codes when selection criteria are met and relevant ICD‑10 diagnoses. If an investigational or not‑covered code/indication is submitted, provide rationale and supporting evidence.

Attach CPT code(s) for the specific manometry procedure.
Attach ICD‑10 diagnosis codes supporting the medical necessity.
If applicable, include related procedure codes (eg, 43235 EGD) used in the diagnostic pathway.

Documentation Required

Documentation to Support Surgical Decision‑Making

Documentation should support use of manometry to guide surgical decision‑making when applicable (eg, colonic manometry results used to decide colectomy or cecostomy). Provide description of how results influenced planned surgery and prior non‑surgical management.

Describe how manometry findings affect the surgical plan (eg, presence/absence of HAPCs, response to provocation).
Include prior conservative treatments tried and outcomes.
Provide surgical indication and anticipated benefit tied to manometry results.

Documentation Required

Required Clinical Documentation (e.g., Endoscopy First, HRM Preferred)

Required clinical documentation includes: prior diagnostic testing (eg, endoscopy/EGD results, gastric emptying studies, electrogastrography), description of symptoms (eg, dysphagia, refractory constipation, nausea/vomiting), trial of conservative therapies, and rationale for the selected motility test. For esophageal symptoms, endoscopy should generally precede manometry; high‑resolution manometry is preferred.

Recent endoscopy results when evaluating dysphagia or pre‑antireflux surgery.
Gastric emptying and/or electrogastrography results when considering antroduodenal manometry.
Clinical history and severity, including duration of symptoms.
Documentation of trials of conservative/medical therapies and responses (see Trial of Conservative Therapies callout).
Specific test protocol (eg, duration of colonic manometry, provocation maneuvers).

Step Therapy

Trial of Conservative Therapies Before Invasive Testing

A trial of conservative therapies is required before invasive motility testing such as antroduodenal manometry in many indications. Document specific empiric therapeutic trials and their duration and response.

Document trials of antiemetic and/or prokinetic agents for nausea/vomiting.
Document conservative management for constipation or defecatory disorders, including biofeedback and pharmacologic therapies.
Record duration and lack of adequate response to conservative measures.

Note

Placeholder Provider Action (Not Specified)

No additional provider action specified in this document beyond the requirements above; follow payer instructions for submission and contact the plan for questions.

If uncertain, contact Aetna for clarification or prior authorization support.

Definitions and Key Terms

inv-36: Antroduodenal manometry definition

DefinitionAntroduodenal manometry measures contractile activity of the distal stomach and duodenum using perfusion ports or solid‑state transducers in a catheter positioned under fluoroscopic guidance, with recordings typically lasting 5 to 24 hours.

Measured statesRecordings assess fasting motor activity and post‑prandial (fed) patterns to evaluate conversion to the fed state and duration of fed pattern.

Technical noteInterpretation requires specialized expertise due to wide normal variation; recordings may be analyzed visually or with computer assistance.

inv-37: Anorectal manometry definition

DefinitionAnorectal manometry measures anal sphincter pressures, rectal sensation, and neural reflexes using a pressure‑sensitive tube to evaluate defecatory function.

Included testsTesting commonly includes rectal balloon testing to assess rectal sensation, tone, and compliance (sensory, motor, biomechanical function).

Clinical usesUsed in evaluation of chronic constipation and fecal incontinence and to assess anorectal dysfunction.

inv-38: Colonic manometry definition

DefinitionColonic manometry records intraluminal pressures within the colon via a catheter fixed to colonic mucosa, with continuous recording for a minimum of 6 hours to evaluate colonic motility.

PurposeUsed to characterize motility patterns (eg, presence/absence of HAPCs, responses to waking, meals, or provocation) and to help distinguish neuropathic vs myopathic profiles in refractory cases.

Typical systemsPerformed using multi‑sensor water‑perfused systems (eg, 6–8 sensors) or high‑resolution solid‑state catheters; HRM provides higher spatial resolution and pressure‑topography displays.

inv-39: High-amplitude propagated contractions (HAPCs) definition

DefinitionHigh‑amplitude propagated contractions (HAPCs) are large propagating colonic contractions recorded on manometry; presence, frequency and propagation characteristics help characterize colonic motor function.

Clinical significanceReduced frequency or absence of HAPCs is associated with slow‑transit constipation and can predict response to surgical interventions in selected patients.

Assessment contextHAPCs are assessed during fasting, after meals, and with provocation (eg, bisacodyl) as part of colonic manometry protocols.

inv-40: Ineffective Esophageal Motility (IEM) definition

Primary definitionIneffective Esophageal Motility (IEM) by HRM: 50–90% of liquid swallows are weak or failed; operationally defined as DCI < 450 mmHg·s·cm in ≥50% of ten liquid swallows under the Chicago Classification.

Clinical caveatThe manometric diagnosis of IEM does not always correlate with symptoms or impaired esophageal function; many patients with IEM may have normal bolus transit by impedance testing.

Use of HRIMHigh‑resolution impedance manometry (HRIM) may add bolus transit measures (eg, EII ratio, BFT) that can aid characterization of symptomatic patients with otherwise normal manometry.

inv-41: Ineffective esophageal motility (IEM) alternate description

Alternate descriptionIEM can be described as 50–90% weak or failed liquid swallows on HRM; classification may not reliably predict symptom severity and should be interpreted with clinical context.

Evidence noteStudies report inconsistent symptom correlation; only a subset of patients with manometric IEM report dysphagia and some have normal bolus transit by impedance testing.

Guideline guidanceGuidelines recommend HRM for suspected motility disorders and note that IEM classification requires clinical correlation prior to management decisions.

inv-42: DCIIR1500 novel parameter definition

Definition of DCIIR1500DCIIR1500 is a novel pressure‑impedance parameter: the distal contractile integral‑to‑impedance index ratio calculated at an impedance threshold of 1500 Ω (DCIIR1500).

Diagnostic performanceIn cohort studies, DCIIR1500 < 0.008 mmHg/Ω was predictive of IEM and remained significant in multivariate analysis (OR = 72.13, p < 0.001).

Subtype differentiationA DCIIR1500 cut‑off of 0.002 mmHg/Ω provided optimal separation between IEM subtypes (IEM‑alternans vs IEM‑persistens) in ROC analysis.

OpenPayer

Gastrointestinal Manometry

Medical Necessity and Coverage Criteria

Procedure and Diagnosis Codes

Provider Requirements, Prior Authorization, and Documentation

Clinical Background and Scope

Definitions and Key Terms