CPT Code 91010: Esophageal Motility Study Billing Guide

Key Takeaways

CPT Code 91010 covers esophageal motility studies – manometric evaluation of the esophagus and/or GEJ – with interpretation and report required for every claim.

Add-on code 91013 is only separately reportable when a stimulant or perfusion agent is used alongside 91010; never bill it as a standalone.

TC and modifier 26 split billing applies when the technical component is performed at an outpatient hospital (POS 22) while the interpreting physician bills from a separate office.

ICD-10-CM codes K21.0, K21.9, K22.0, K22.4, and R13.10 are the primary diagnosis codes supporting medical necessity for CPT Code 91010 claims.

Missing or incomplete documentation – especially the signed interpretation report – is the leading cause of CPT 91010 claim denials across Medicare and commercial payers.

GI motility studies are among the most documentation-sensitive procedures in gastroenterology billing. A missing interpretation report, wrong place-of-service code, or misapplied modifier can turn a covered esophageal manometry claim into a denial. CPT Code 91010 – the code for esophageal motility studies with interpretation and report – requires precise documentation, correct ICD-10 pairing, and an understanding of when add-on code 91013 applies. This guide covers everything GI billing specialists and practice managers need to submit clean claims and avoid the most common denial triggers.

This article covers the official descriptor, clinical indications, applicable modifiers, ICD-10 diagnosis codes, Medicare fee schedule data, NCCI bundling considerations, related codes, and documentation requirements for CPT Code 91010.

CPT Code 91010: Descriptor, Clinical Definition, and Procedure Overview

The official American Medical Association descriptor for CPT Code 91010 is: Esophageal motility (manometric study of the esophagus and/or gastroesophageal junction) study with interpretation and report. This descriptor, maintained by the American Medical Association as part of the CPT code set, defines both the technical procedure and the required physician deliverable.

Esophageal manometry measures the pressure and coordination of muscle contractions along the esophagus and at the gastroesophageal junction (GEJ). A thin, flexible catheter with pressure sensors is passed transnasally into the esophagus, and the patient is asked to swallow small sips of water. The manometer records pressure waveforms at multiple points simultaneously, generating data on lower esophageal sphincter (LES) pressure, peristaltic amplitude, and GEJ relaxation.

The phrase “with interpretation and report” in the CPT Code 91010 descriptor is not incidental. The physician must produce a written, signed interpretation that becomes part of the medical record. Without it, the claim lacks a billable professional component and is subject to denial on audit. This is distinct from simply supervising the technical study.

Clinical Indications for CPT Code 91010

Payers cover CPT Code 91010 when the esophageal motility study is medically necessary to evaluate a diagnosed or suspected esophageal motility disorder. The most common clinical indications include:

• GERD (K21.0, K21.9): Manometry is used pre-operatively before fundoplication to assess peristaltic function, and diagnostically when pH monitoring findings are ambiguous.
• Achalasia (K22.0): High-resolution manometry is the gold-standard test for achalasia diagnosis, detecting aperistalsis and impaired LES relaxation.
• Dysphagia (R13.10): When endoscopy and barium swallow are inconclusive, motility testing identifies neuromuscular causes of swallowing difficulty.
• Esophageal dyskinesia (K22.4): Covers spastic motility disorders such as diffuse esophageal spasm and hypercontractile (Jackhammer) esophagus.

High-resolution manometry (HRM) systems like the Medtronic ManoScan use the same CPT Code 91010 for esophageal studies – there is no separate HRM-specific CPT code. The upgrade in technology does not change the billing code, though documentation should note the equipment used.

CPT Code 91010 Modifiers: TC, 26, 59, and Global Billing

Modifier selection for CPT Code 91010 is one of the most frequent sources of billing errors in GI practices. The correct modifier depends entirely on who performs the technical component and where the study is conducted.

According to guidance published by the American Society for Gastrointestinal Endoscopy (ASGE), when the technical component of CPT Code 91010 is performed at an outpatient hospital facility (Place of Service 22), the hospital bills with the TC modifier. The interpreting gastroenterologist then bills CPT Code 91010 with modifier 26 from their own practice. Both components are billed separately under this split arrangement.

Global billing – no modifier – applies when the physician owns or leases the manometry equipment, performs the procedure in their own office, and produces the written interpretation. This is the most straightforward scenario for independent GI practices with in-house claims management.

Modifier 59 distinguishes CPT Code 91010 as a distinct procedural service when it is billed on the same date as another procedure that would otherwise trigger an NCCI edit. Use modifier 59 only when the services are genuinely separate, with distinct documentation supporting each. Never apply modifier 59 as a blanket denial override.

ICD-10-CM Diagnosis Codes Supporting CPT Code 91010 Medical Necessity

Every CPT Code 91010 claim requires a paired ICD-10-CM diagnosis code that establishes medical necessity. Payers cross-reference the submitted diagnosis against their Local Coverage Determinations (LCDs) and coverage policies. The following codes are the primary diagnosis codes recognized for esophageal manometry coverage:

CPT Code 91010 Supported ICD-10-CM Codes

• K21.0 (GERD with esophagitis): Active erosive esophagitis secondary to reflux; common pre-surgical indication
• K21.9 (GERD without esophagitis): Non-erosive reflux disease when pH and symptom correlation require motility evaluation
• K22.0 (Achalasia of cardia): Primary indication for manometry; confirms aperistalsis and LES dysfunction
• K22.4 (Dyskinesia of esophagus): Spastic motility disorders including diffuse esophageal spasm
• R13.10 (Dysphagia, unspecified): When more specific dysphagia etiology has not yet been established
• K23 (Disorders of esophagus in diseases classified elsewhere): For esophageal involvement in systemic diseases such as scleroderma

Verify diagnosis code validity against the CDC/NCHS ICD-10-CM web tool before submission, particularly after October 1 annual code updates. Submitting a deleted or unspecified code when a more specific code is available is a common denial trigger for CPT Code 91010 claims.

Commercial payers such as Blue Cross Blue Shield of Michigan (BCBSM) and Aetna maintain their own medical policies for esophageal motility testing. BCBSM’s policy specifically covers CPT Code 91010 and 91013 for 2D esophageal motility studies. Aetna’s Clinical Policy Bulletin 0667 addresses esophageal and airway pH monitoring alongside motility testing – payers may require prior authorization when pH monitoring and manometry are ordered together. Always verify authorization requirements with the specific payer before scheduling the study.

CPT Code 91010 Reimbursement: Medicare Fee Schedule and RVU Data

Medicare reimbursement for CPT Code 91010 is determined by the CMS Physician Fee Schedule, which assigns Relative Value Units (RVUs) for work, practice expense, and malpractice components. Because rates vary by geographic locality and are updated annually, always verify the current year’s rate in the CMS PFS lookup before quoting expected payment.

For the 2025 fee schedule, the national non-facility (office) rate for CPT Code 91010 falls in the range of $150-$200, while the facility rate (for TC or 26 billing at outpatient hospital) is lower, reflecting that the facility overhead is billed separately. Exact figures depend on the Geographic Practice Cost Index (GPCI) for the provider’s locality. Use the FastRVU 2026 RVU lookup tool to calculate location-adjusted reimbursement for your practice’s ZIP code.

For commercial payers, reimbursement commonly exceeds Medicare rates by 110-140%, depending on the practice’s contracted fee schedule. Out-of-network or self-pay rates vary widely. The claims management workflow in your practice management system should flag any CPT Code 91010 claims where the payer’s allowed amount is below the contracted rate for follow-up.

CPT Code 91010 and the Add-On Code 91013

CPT Code 91013 is an add-on code to 91010 that covers the use of a pharmacologic stimulant or perfusion agent during the esophageal motility study. It is only separately reportable when the stimulant or perfusion protocol is actually performed – it cannot be billed independently or without the primary code 91010.

Common clinical applications for 91013 include edrophonium (Tensilon) provocation testing or acid perfusion (Bernstein test) to reproduce symptoms during the study. When billing 91013 alongside CPT Code 91010, the operative note or procedure report must document which agent was used, the dose, and the clinical response observed. Both codes should appear on the same claim line date of service.

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NCCI Bundling Rules for CPT Code 91010

The National Correct Coding Initiative (NCCI), maintained by CMS under the Medicare NCCI Policy Manual, governs which procedure codes can be billed together. Chapter 6 of the NCCI Policy Manual covers gastroenterological procedures, explicitly including the CPT code range beginning at 91010.

The key NCCI principle for CPT Code 91010 is that bundling occurs when a component service is inherently part of a more comprehensive procedure. In practical terms, this means:

• 91010 and 91013: 91013 is an add-on and is never independently billable. It does not create a bundling edit with 91010 because they are designed to be billed together when applicable.
• 91010 and 91020/91022: Gastric motility (91020) and duodenal motility (91022) may be billed alongside esophageal motility on the same date when separate, distinct studies of each anatomical area are performed and documented. The procedure report must clearly document each study independently.
• 91010 and evaluation/management codes: Separately billing an E/M visit on the same date as CPT Code 91010 requires modifier 25 on the E/M code, with documentation showing a significant, separately identifiable service beyond the procedure itself.

Check the current NCCI edits using the CMS coding and billing resources before billing any combination involving CPT Code 91010. NCCI edit tables are updated quarterly. A code pair that was payable in Q1 may become bundled in Q3 without advance notification in most payer portals.

For practices managing multiple GI procedure codes simultaneously, the Pabau clinic dashboard centralizes billing status tracking across all open claims, reducing the risk of missed bundling edits slipping through to submission.

Documentation Requirements for CPT Code 91010 Claims

Clean CPT Code 91010 claims depend on documentation that supports both the procedure itself and the payer’s medical necessity criteria. Incomplete records are the leading cause of post-payment audits and recoupment demands in GI billing.

Every CPT Code 91010 submission should be backed by a complete documentation package. The elements below are required for Medicare and are expected by most commercial payers:

• Physician order: Written order documenting the clinical indication and the specific study ordered (esophageal manometry)
• Signed interpretation and report: A separate, dated, physician-signed report summarizing the manometric findings – this is the deliverable referenced in the code descriptor
• Procedural note: Documents the equipment used, the protocol followed, patient tolerance, and any adverse events
• Supporting diagnosis documentation: Records that substantiate the ICD-10 code submitted – endoscopy reports, pH study results, or symptom history for GERD, dysphagia, or achalasia
• Prior authorization confirmation: If required by the payer, the authorization number must appear on the claim

Under HIPAA, all documentation containing protected health information (PHI) must be stored, transmitted, and accessed in compliance with the Security Rule. This applies to digital manometry reports, scanned physician orders, and billing records associated with CPT Code 91010. Practices using digital forms and documentation tools should confirm their platform’s HIPAA compliance before storing procedure reports electronically.

The American Neurogastroenterology and Motility Society (ANMS) has published coding guidance for esophageal function testing, noting that the written interpretation is the single most audited documentation element for motility study claims. A telephone call to the referring physician discussing results does not substitute for a formal written report when a payer audits the record.

Related CPT Codes: When to Use 91013, 91034, 91037, and 91020

CPT Code 91010 sits within the upper gastrointestinal motility studies range (91010-91022). Understanding where 91010 ends and adjacent codes begin prevents both under-coding and duplicate billing. The table below summarizes the most relevant related codes for GI billing specialists.

A common coding question involves CPT Code 91010 versus CPT Code 91037. CPT 91037 covers esophageal function testing with provocation – it is not interchangeable with 91010. While both involve esophageal assessment, 91037 uses a provocation protocol rather than a standard manometric study. Billing 91010 when the documented procedure matches 91037’s description constitutes upcoding. Always map the procedure report to the code descriptor, not the other way around.

GI practices using integrated claims management software can build code-pair rules into their billing workflow, flagging any claim that submits 91013 without 91010, or that submits 91010 alongside 91037 without modifier 59 documentation in the chart.

CPT Code 91010 Billing Workflow: From Procedure to Paid Claim

A systematic billing workflow reduces denial rates and accelerates reimbursement for esophageal manometry studies. The following steps reflect best practice for GI practices billing CPT Code 91010 through Medicare and commercial payers.

1. Verify medical necessity before scheduling. Confirm the referring diagnosis supports coverage under the payer’s LCD or medical policy. For BCBSM and Aetna accounts, check whether prior authorization is required for CPT Code 91010 based on the current policy revision.
2. Document the clinical indication at point of service. The procedure order must reference the ICD-10 code and the clinical question the study is designed to answer. A vague order (“esophageal study requested”) is insufficient.
3. Perform and document the study completely. The procedural note must include equipment type, catheter placement protocol, number of swallows recorded, and any complications. For HRM studies, note the system used (e.g., ManoScan).
4. Generate the signed interpretation and report. This is the most audited document. The report should include: study indication, technical findings, diagnostic impression, and the interpreting physician’s signature and date. Verbal reports do not satisfy this requirement.
5. Assign codes and modifiers correctly. Select the appropriate modifier based on place of service and billing arrangement. Pair with the correct ICD-10-CM diagnosis code.
6. Submit within timely filing deadlines. Medicare’s timely filing limit is one year from the date of service. Many commercial payers impose 90-180 day limits. Automated workflow tools can trigger billing staff alerts when a CPT Code 91010 claim approaches the filing deadline.
7. Track and appeal denials promptly. Common denial reasons include: missing interpretation report, unsupported ICD-10 code, incorrect place of service, or bundling edit triggered. Each has a distinct appeal pathway.

Practices managing multiple gastroenterology CPT codes benefit from a structured revenue cycle platform. The dashboard view in Pabau provides real-time visibility into claim status, outstanding authorizations, and denial trends by code – reducing the manual follow-up burden for billing teams handling CPT Code 91010 alongside colonoscopy, pH monitoring, and other GI procedure codes.

Expert Picks: Related Billing and Documentation Resources

Expert Picks

Need an overview of CPT code structure and AMA maintenance? AMA CPT Code Set Overview explains how CPT codes are categorized, maintained, and updated annually.

Looking for complete gastroenterology coding guidance? Pabau Claims Management Software helps GI practices submit accurate claims and track denial trends across all procedure codes.

Need to verify current Medicare fee schedule rates for CPT Code 91010? CMS Physician Fee Schedule Lookup provides locality-adjusted payment amounts for every CPT code.

Want to streamline documentation workflows for esophageal manometry? Pabau Digital Forms supports HIPAA-compliant procedure documentation and signed interpretation report capture.

Conclusion

Esophageal manometry claim denials are rarely about the procedure itself. They happen because the interpretation report is missing, the ICD-10 code doesn’t match the payer’s covered diagnosis list, or the modifier doesn’t reflect the actual place-of-service arrangement. Getting CPT Code 91010 right requires airtight documentation, correct code pairing with 91013 when applicable, and a workflow that catches errors before submission – not after denial.

Pabau’s claims management software helps gastroenterology practices build these controls directly into their billing workflow, from documentation capture to claim submission tracking. To see how it handles CPT Code 91010 and the wider GI procedure code set, book a demo with the Pabau team.

Reviewed against current AMA CPT coding guidance, ANMS billing resources, and CMS NCCI Policy Manual Chapter 6 gastroenterological procedures guidance.

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