Summary & Overview
CPT 91112: Wireless Capsule Gastric and Colonic Motility Study
CPT code 91112 denotes a diagnostic gastrointestinal motility study performed with a wireless capsule imaging device that measures transit time and pressure/strength of muscle contractions in the stomach and colon, with provider interpretation and reporting. Nationally, this code captures an advanced, minimally invasive physiologic test used to evaluate suspected gastroparesis, chronic constipation, and other motility disorders when direct manometry or traditional transit studies are not suitable. Its use affects clinical pathways for digestive disorders and enters payer coverage discussions because of device costs and the need for specialist interpretation.
Key payers referenced in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical purpose and typical care setting for the service, followed by benchmarking information, payer coverage patterns, and relevant policy considerations where available. The publication outlines how the service is billed, common modifier usage, and practical claims considerations that influence reimbursement and utilization. Data not available in the input is identified explicitly where applicable. The content is intended to support coding, billing, and policy review for clinicians, revenue cycle staff, and payers evaluating use of wireless capsule-based gastric and colonic motility studies.
Billing Code Overview
CPT code 91112 describes a diagnostic service in which the provider measures the timing and the pressure or strength of muscle contractions as food moves through the stomach and colon using a wireless capsule imaging device. The provider interprets the physiologic findings from the capsule study and prepares a written report.
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Service type: Diagnostic gastrointestinal motility study using a wireless capsule device
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Typical site of service: Outpatient gastroenterology clinic or ambulatory procedural setting where capsule ingestion and remote monitoring occur
Clinical & Coding Specifications
Clinical Context
A 45-year-old patient with chronic unexplained abdominal pain, intermittent bloating, and constipation is referred for evaluation of suspected gastroparesis and generalized gastrointestinal motility disorder. The clinician elects to perform wireless motility capsule testing to measure transit times and intraluminal pressure changes throughout the stomach, small bowel and colon. The test workflow: outpatient visit for consent and instruction; patient swallows a wireless capsule in clinic; ambulatory monitoring over several days with external recorder; return of the recorder and data download; physician interpretation of transit times, pressure/contractility events, and generation of a formal report. Typical site of service is an outpatient gastroenterology clinic or ambulatory surgery center with remote ambulatory data collection; the physician performing interpretation is commonly a gastroenterologist or motility specialist.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the physician interpretation/report separate from technical monitoring equipment provided by another entity. |
52 | Reduced services | Use when the test is partially completed or abbreviated due to patient factors but still interpretable. |
53 | Discontinued procedure | Use when the procedure is started but discontinued and cannot be completed; report if documentation supports termination. |
59 | Data not available in the input. | Data not available in the input. |
78 | Return to operating room for related procedure during postoperative period | Use rarely; not typically applicable to ambulatory capsule testing but included when subsequent related operative intervention occurs. |
80 | Data not available in the input. | Data not available in the input. |
82 | Data not available in the input. | Data not available in the input. |
AS | Ambulatory surgical center facility service | Use when the technical component occurs at an ASC and billing requires AS to denote facility. |
TC | Technical component | Use when billing only the technical monitoring and recorder services, not the physician interpretation. |
QK | Medical direction of two, three, or four qualified personnel | Use when the physician medically directs the technical staff involved in device handling/monitoring in jurisdictions where applicable. |
QX | CRNA service with medical direction by a physician | Data not applicable for typical capsule testing; include only when billing rules require anesthesia-related modifier. |
QY | Medical direction of one certified registered nurse anesthetist (CRNA) | Data not applicable for typical capsule testing. |
11 | Data not available in the input. | Data not available in the input. |
22 | Increased procedural services | Use when documentation supports unusually high complexity of interpretation or extended reporting time beyond typical. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207RG0100X | Gastroenterology | Physicians who commonly perform and interpret gastrointestinal motility testing. |
| 207RH0000X | Internal Medicine - Gastroenterology | General internists with GI focus interpreting motility studies. |
| 103K00000X | Diagnostic Radiology | Radiologists occasionally interpret capsule studies when imaging correlation is needed. |
| 207L00000X | General Practice | Primary care clinicians coordinating referral and follow-up for motility testing. |
| 208800000X | Surgery - Colon & Rectal Surgery | Colorectal surgeons involved when transit disturbances lead to surgical consideration. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
K31.84 | Gastroparesis | Primary indication for gastric transit and motility assessment with a wireless capsule. |
K59.00 | Constipation, unspecified | Common symptom prompting evaluation of colonic transit and motility. |
K58.9 | Irritable bowel syndrome without diarrhea | Used when chronic abdominal pain and altered bowel habits warrant motility testing. |
R10.9 | Abdominal pain, unspecified | Non-specific presentation that may lead to motility evaluation to assess transit abnormalities. |
K20 | Esophagitis | Included when proximal motility issues are suspected to affect capsule transit; prompts upper GI correlation. |
R14.0 | Abdominal distension (gaseous) | Symptom often associated with delayed transit or dysmotility assessed by capsule testing. |
K59.3 | Megacolon | Severe colonic dysmotility concern where transit and pressure measurement are clinically relevant. |
G90.3 | Multisystem degeneration of autonomic nervous system | Autonomic neuropathy can cause gastrointestinal dysmotility assessed by wireless capsule testing. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
91112 | Measurement of gastrointestinal transit and pressure using a wireless capsule imaging device; interpretation and report | This is the primary code describing swallowing the wireless motility capsule, ambulatory monitoring, interpretation and formal reporting. |
91034 | Gastrointestinal transit time analysis; capsule endoscopy, including data analysis and interpretation (example diagnostic capsule code) | Performed in similar clinical workflows for small-bowel transit and mucosal assessment; may be used when capsule provides imaging focus rather than motility metrics. |
43239 | Esophagogastroduodenoscopy, flexible, diagnostic, with or without collection of specimen(s) by brushing or washing (separate diagnostic endoscopy code) | May be performed before or after capsule testing to evaluate mucosal lesions or obstructive pathology that could affect capsule passage. |
93501 | Right heart catheterization (example unrelated advanced procedure) | Data not available in the input. |
91110 | Gastrointestinal transit and pressure measurement using ingestible capsule, without imaging (example related) | Alternative or historical code related to capsule motility testing focusing on transit and pressure without imaging interpretation. |