CPT® Code 00731

Quick Reference

• Code definition: CPT 00731 covers anesthesia services for upper GI endoscopic procedures where the endoscope is introduced proximal to the duodenum (esophagus, stomach, proximal duodenum), for any upper GI endoscopy that is not ERCP.
• Key billing rule: Anesthesia is billed using the base unit + time unit formula: (Base Units + Time Units + Qualifying Circumstance Units) × Conversion Factor. Time units accrue in 15-minute increments (1 unit per 15 minutes; confirm increment with each payer).
• Modifier essentials: A provider-role modifier is required on every claim: AA (anesthesiologist personally performing), QK (medically directing 2-4 CRNAs), QX (CRNA under medical direction), QY (physician directing one CRNA), QZ (independent CRNA), or AD (supervising more than 4 concurrent cases). A physical status modifier (P1-P6) is also required to document patient acuity.
• Documentation must-have: Medical necessity documentation justifying anesthesia professional services (rather than proceduralist-administered moderate sedation) is the single most critical element for Medicare MAC claims. Its absence is the leading cause of denial.
• Top confusion point: Do not use 00731 when ERCP is performed; ERCP requires 00732. Similarly, when EGD and colonoscopy are performed in the same anesthetic event, report 00813 rather than 00731 plus a lower GI anesthesia code.
• Payer alert: Medicare and most MACs require individualized medical necessity documentation for MAC in the endoscopy setting. Blanket propofol MAC for all EGDs, without patient-specific justification, is an active OIG and MAC audit target.
• Add-on code: 0887T (end-tidal control of inhaled anesthetic agents and oxygen) may be reported in addition to 00731 when that technology is used.

When to Use This Code

Clinical indications. 00731 applies to anesthesia for any upper GI endoscopic procedure where the endoscope is introduced proximal to the duodenum and the specific procedure is not ERCP. This includes:

• Diagnostic and therapeutic esophagogastroduodenoscopy (EGD): evaluation of dyspepsia, GERD, dysphagia, nausea or vomiting
• EGD with biopsy (e.g., Barrett's surveillance, gastric lesion, H. pylori sampling)
• Therapeutic upper endoscopy: variceal banding, hemostasis for peptic ulcer bleeding, dilation of esophageal strictures, foreign body removal, percutaneous endoscopic gastrostomy (PEG) tube placement
• Esophagoscopy and upper GI endoscopy for acute bleeding (Mallory-Weiss, Dieulafoy lesions, peptic ulcers)

Scope boundaries. The "proximal to duodenum" anatomic qualifier is the key technical boundary. ERCP pushes past this scope by introducing the endoscope into the biliary and pancreatic ductal systems, which is why it has its own code (00732). Any endoscopy that does not reach or cannulate the biliary or pancreatic ducts stays within 00731 territory. If both upper and lower GI endoscopy occur under a single anesthetic, 00813 applies rather than splitting the codes.

Anesthesia type. The code applies regardless of whether the patient receives MAC (most common in upper GI endoscopy), deep sedation, or general anesthesia. The code does not differentiate by anesthesia technique; the technique distinction is captured through provider-role modifiers and medical necessity documentation.

Provider and setting context. 00731 is billed by the anesthesia provider, not the gastroenterologist. It appears on the anesthesiologist's or CRNA's claim only. The gastroenterologist submits the endoscopy procedure code (e.g., 43235, 43239, 43245) on a separate claim. Both claims can be submitted; they are not duplicates. The global days indicator is XXX, meaning the global surgery concept does not apply to anesthesia codes.

Code Differentiation Table

The most critical differentiator: 00731 vs. 00732 turns on whether ERCP was actually completed. If the endoscope was advanced but cannulation was not achieved or ERCP was not attempted, the procedure was not an ERCP and 00731 is correct. Document what was actually performed.

Billing & Modifier Rules

Provider-role modifiers. Every anesthesia claim requires one of the following:

Physical status modifiers. Append one P modifier per claim. P1 through P6 are informational for documentation; ASA guidelines add base units for P3 and above, but verify current CMS Physician Fee Schedule rules for Medicare payment impact.

Qualifying circumstance add-on codes. Report alongside 00731 when applicable:

• 99100: Extreme age (under 1 year or over 70 years). Adds 1 base unit per ASA guidelines. Document exact age.
• 99116: Total body hypothermia. Rarely applicable in GI endoscopy.
• 99135: Controlled hypotension. Rarely applicable in GI endoscopy.
• 99140: Emergency conditions. Adds 2 base units per ASA guidelines. The record must document why delay would threaten the patient's life.

Add-on code. 0887T (end-tidal control of inhaled anesthetic agents and oxygen to assist anesthesia care delivery) is reported in addition to 00731 when that technology is used. List separately; do not use 0887T as a standalone code.

Time reporting. Anesthesia time begins when the anesthesiologist begins preparing the patient for induction and ends when the patient is safely placed under post-anesthesia supervision. Report time in units on the claim; billed units must match the documented anesthesia record. Most Medicare Administrative Contractors use 15-minute increments; confirm with individual payers.

MUE. The database reflects "Not applicable/unspecified," consistent with anesthesia codes being reported once per anesthesia encounter regardless of procedure duration. Multiple units on a single date represent time units, not separate instances of the code.

Billing separation. 00731 and the endoscopy procedure code are never on the same claim from the same provider. The anesthesiologist submits 00731 only. The gastroenterologist submits the endoscopy CPT code (e.g., 43235, 43239, 43245) only.

Documentation Essentials

Required anesthesia record elements:

• Pre-anesthesia evaluation: patient history, physical examination, documented ASA physical status classification with clinical rationale, comorbidities, informed consent
• Anesthesia start and end times (not procedure start and end times; these differ)
• All agents administered: drug name, dose, route, time of administration
• Continuous monitoring data: vital signs, oxygen saturation, airway management technique, end-tidal CO2 if applicable
• Post-anesthesia evaluation and disposition

MAC medical necessity documentation. For Medicare claims, documentation must establish that the patient's condition required an anesthesia professional rather than moderate sedation administered by the gastroenterologist. Acceptable clinical justifications include significant cardiopulmonary comorbidities, morbid obesity with difficult airway, prior sedation failure, prolonged or complex therapeutic procedure, high aspiration risk (e.g., active GI bleed), or documented patient anxiety requiring anesthesia professional presence. A generic notation such as "patient requested anesthesia" or "facility preference" is insufficient and is the most frequently cited basis for MAC claim denial.

Qualifying circumstance documentation. If 99100 is billed, the anesthesia record must reflect the patient's age explicitly. If 99140 is billed, the record must describe the emergency condition and explain why delay would have posed a threat to life. These elements are subject to focused review.

Audit red flags specific to 00731:

• Anesthesia time on the claim that does not match documented start and end times in the anesthesia record
• Missing or generic MAC medical necessity language (template language without individualization)
• Physical status modifier inconsistent with documented comorbidities
• 00731 billed for a case where the procedure code indicates ERCP (43260-43278 range) was performed
• 99100 billed for patients between ages 1 and 70 without clinical explanation

Medicare, Commercial & Medicaid Payer Rules

Medicare.

Medicare covers anesthesia services for upper GI endoscopy when medically necessary. For MAC cases specifically, CMS and MACs have issued guidance requiring documentation of individual medical necessity for the presence of an anesthesia professional. CMS has signaled through carrier guidance and OIG work plan activity that routine administration of MAC for all EGD patients without individualized clinical justification is not covered.

Multiple MACs have issued Local Coverage Determinations (LCDs) on MAC for GI endoscopy. These LCDs define acceptable medical necessity criteria and documentation requirements. Verify applicable LCDs by searching the CMS Medicare Coverage Database using terms such as "monitored anesthesia care" or "anesthesia endoscopy," then filter by your MAC jurisdiction (CGS, Novitas, Palmetto, NGS, Noridian, WPS).

The global days indicator for 00731 is XXX (global concept does not apply). Pre-operative and post-operative evaluation and management services are not bundled into the anesthesia payment and may be separately billable.

Commercial payers.

Commercial payers generally follow Medicare principles for anesthesia billing, including the provider-role modifier requirements and time-unit reporting. Prior authorization requirements vary; verify with individual payer contracts for facility-based procedures, particularly for high-utilization GI endoscopy settings. Some commercial plans apply automated edits that flag anesthesia claims for EGD when the diagnosis does not meet their internal medical necessity thresholds.

Medicaid and state programs.

Medicaid anesthesia coverage for upper GI endoscopy varies by state. Many fee-for-service Medicaid programs follow Medicare base unit values and time conventions. Managed Medicaid plans may impose prior authorization requirements for elective upper GI endoscopy procedures. Verify with the applicable state program or managed care plan.

Common Denials & Prevention

Missing or inadequate MAC medical necessity documentation

This is the leading denial reason for 00731 claims in the Medicare population. Payers deny when the anesthesia record does not document patient-specific clinical factors requiring an anesthesia professional rather than proceduralist-administered moderate sedation. Prevention: Build documentation templates that require selection or narration of specific clinical indications (listed under Documentation Essentials above). Generic language does not satisfy LCD requirements.

Wrong code billed for ERCP

When the gastroenterologist's claim shows an ERCP procedure code (43260-43278 range) and the anesthesiologist bills 00731 rather than 00732, the claim may be denied on medical necessity grounds or flagged for review. Prevention: Anesthesia billing staff should confirm the operative procedure before code selection. When ERCP was attempted but not completed, document the specific procedure performed and why 00731 is appropriate.

Missing provider-role modifier

Medicare requires a provider-role modifier (AA, QK, QX, QY, QZ, or AD) on every anesthesia claim. Claims submitted without these modifiers deny. Prevention: Build a claim edit in the billing system that rejects submissions without an anesthesia provider-role modifier.

Time unit mismatch

If the billed time units do not reconcile with documented anesthesia start and stop times, payers deny or recalculate payment. Prevention: Cross-check billed units against the anesthesia record before claim submission. Confirm the time increment used by the payer (most Medicare use 15-minute increments; some commercial payers differ).

Unsupported qualifying circumstance add-on

Billing 99100 for patients aged 1-70 without documentation, or billing 99140 without emergency narrative, results in denial of the add-on code. Prevention: Add automated age-check logic for 99100; require a specific emergency notation field in anesthesia records before 99140 can be selected.

Coding Scenarios

Scenario 1: A 58-year-old patient with well-controlled hypertension (ASA P2) undergoes diagnostic EGD for evaluation of chronic dyspepsia. The anesthesiologist personally administers propofol MAC. Anesthesia time is 28 minutes. Prior sedation failure is documented in the chart.

Correct coding: 00731-AA-P2 plus time units (2 units at 15-minute increments). No qualifying circumstance add-on.

Why: Procedure is upper GI endoscopy, not ERCP; anesthesiologist personally performed; prior sedation failure provides MAC medical necessity documentation.

Scenario 2: A 74-year-old patient (ASA P2) undergoes EGD with biopsy for Barrett's esophagus surveillance. MAC with propofol is administered by the anesthesiologist personally. Anesthesia time is 22 minutes.

Correct coding: 00731-AA-P2 plus 99100 (patient age over 70) plus time units.

Why: Patient age exceeds 70, qualifying for the extreme age add-on. Document patient's date of birth or explicit age in the anesthesia record; the add-on cannot be supported without it.

Scenario 3: A 65-year-old patient (ASA P3, severe COPD) is scheduled for possible ERCP. The endoscope is introduced, EGD is completed, but cannulation of the bile duct is not achieved and ERCP is not performed. The anesthesiologist personally performs anesthesia.

Correct coding: 00731-AA-P3 plus time units. Not 00732.

Why: ERCP was not performed. 00732 is appropriate only when ERCP is actually completed. The record must reflect what procedure was performed and why 00731 is the accurate code.

Scenario 4: A 50-year-old patient (ASA P4) with active hematemesis undergoes emergent EGD for variceal banding. The anesthesiologist personally performs general anesthesia due to high aspiration risk. The anesthesia record documents hemodynamic instability and the emergent nature of the procedure.

Correct coding: 00731-AA-P4 plus 99140 plus time units.

Why: Emergency conditions add-on (99140) applies when delay would threaten the patient's life; the record must narrate the emergency. High aspiration risk and active bleeding provide documented clinical justification for anesthesia professional services rather than moderate sedation.

Related Codes

• 00732: Anesthesia, upper GI endoscopy; ERCP specifically. Use when ERCP is performed rather than EGD NOS.
• 00811: Anesthesia, lower intestinal endoscopic procedures, NOS. Paired lower GI counterpart to 00731.
• 00812: Anesthesia, lower intestinal endoscopy; screening colonoscopy. Screening-specific lower GI code.
• 00813: Anesthesia, combined upper and lower GI endoscopy. Reports when EGD and colonoscopy are performed in the same anesthetic event.
• 00740: Deleted predecessor to 00731 and 00732 (deleted effective January 1, 2018). Do not use for dates of service on or after 2018-01-01.
• 0887T: End-tidal control of inhaled anesthetic agents and oxygen. Add-on code reported with 00731 when that monitoring technology is used.
• 99100: Qualifying circumstance, extreme age. Add-on when patient is under 1 year or over 70 years.
• 99140: Qualifying circumstance, emergency conditions. Add-on when emergent nature of the procedure is documented.
• 43235: Upper GI endoscopy; diagnostic. The gastroenterologist's base procedure code most commonly paired with 00731 (billed by the gastroenterologist on a separate claim).
• 43239: Upper GI endoscopy with biopsy. Common gastroenterologist procedure code billed separately from 00731.

Sources

1. AMA CPT database: code 00731 official description, code history (added 2018-01-01), status indicators, MUE, global days, type of service. Internal database, current as of code maintenance cycle.
2. AMA CPT database: codes 00732, 00740 (deleted), 00811, 00812, 00813, 0887T. Same source.
3. AMA CPT database: qualifying circumstance codes 99100, 99116, 99135, 99140. Same source.
4. AMA CPT codebook, Anesthesia section guidelines. Cited in code data for 00731; manual verification recommended against current year AMA CPT codebook.
5. CMS Physician Fee Schedule, Anesthesia Base Unit File. Verify current year base units for 00731 at the CMS Physician Fee Schedule lookup tool.
6. CMS Medicare Coverage Database. Search active LCDs on "monitored anesthesia care" or "anesthesia endoscopy" filtered by MAC jurisdiction.
7. HHS OIG Work Plan and published reports on anesthesia services for GI endoscopy. Review current items at oig.hhs.gov for active compliance focus areas.