Summary & Overview

HCPCS G1011: Clinical Decision Support Mechanism, Qualified Tool

HCPCS Level II code G1011 denotes a qualified clinical decision support mechanism used to apply Medicare Appropriate Use Criteria for diagnostic imaging. Nationally, this code reflects efforts to standardize imaging decisions, reduce unnecessary testing, and document the use of certified decision tools in clinical workflows. Use of G1011 is relevant to payers and providers focused on evidence-based imaging utilization and compliance with program requirements.

Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The summary covers coverage expectations and program alignment across major national payers.

Readers will find a concise overview of what G1011 represents, the clinical context for decision-support services in imaging, and the typical sites of service where such tools operate. The publication includes benchmarking considerations, policy and program updates related to Medicare Appropriate Use Criteria, and practical coding and billing context for provider administrative teams. Data not available in the input will be noted where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareG1011HCPCS Level IIclinical decision supportappropriate use criteriadiagnostic imagingimaging utilizationhealth ITmedical billingdocumentation

Billing Code Overview

HCPCS Level II code G1011 describes a clinical decision support mechanism, qualified tool not otherwise specified, as defined by the Medicare Appropriate Use Criteria program. This code represents the use of a qualified clinical decision support (CDS) tool that assists clinicians in applying appropriate use criteria for advanced diagnostic imaging and related decisions.

Service Type: Clinical decision support service

Typical Site of Service: Office-based or facility-based clinical settings where diagnostic imaging decisions are made, including outpatient clinics and hospitals

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A typical patient scenario involves an outpatient or ambulatory imaging center where a clinician orders an advanced imaging study (for example, coronary CT angiography or CT for suspected pulmonary embolism) for a symptomatic adult. Prior to scheduling or performing the advanced imaging, a qualified Clinical Decision Support (CDS) tool integrated with the Medicare Appropriate Use Criteria (AUC) program is consulted to determine whether the study is appropriate given the patient’s presenting symptoms, history, and prior testing. The ordering clinician (frequently an emergency physician, cardiologist, pulmonologist, or primary care physician) enters patient-specific clinical data into the qualified CDS mechanism. The CDS returns an appropriateness determination (appropriate, may be appropriate, or not appropriate) and documents the decision logic and reference AUC. The imaging facility or billing office applies the HCPCS Level II code G1011 to report use of a qualified clinical decision support mechanism when required by Medicare AUC program rules. Typical sites of service include hospital outpatient departments, ambulatory surgery centers, emergency departments, and physician offices connected to imaging services. The workflow produces a recorded CDS consultation in the medical record that supports the ordering decision and is available for audit or payer review.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when additional work beyond the usual service is documented related to the imaging decision process or complex documentation supporting the AUC consultation.
`23`	Unusual anesthesia	Use if general anesthesia or deep sedation was required for a related imaging procedure and must be indicated on the claim.
`52`	Reduced services	Use when the ordered imaging procedure was partially performed or limited after CDS consultation.
`53`	Discontinued procedure	Use when an imaging procedure was started but terminated due to clinical findings discovered during CDS-driven evaluation or immediate pre-procedure assessment.
`54`	Surgical care only	Use when only the surgeon’s portion is billed and the CDS entry pertains to preoperative imaging decisions.
`55`	Postoperative management only	Use when only postoperative care is billed and the CDS documentation influenced follow-up imaging decisions.
`56`	Preoperative management only	Use when only preoperative care is billed and the CDS consultation informed imaging prior to surgery.
`62`	Two surgeons	Use when two surgeons are required for the related operative procedure and CDS-supported imaging impacted surgical planning.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery	Use when an advanced practice clinician assisted with a procedure and CDS documentation relates to preoperative imaging decisions.
`CO`	Out-of-state provider	Use when the billing provider is located out-of-state for payer jurisdiction reporting tied to the imaging service.
`CQ`	Service furnished by a resident without an attending physician present	Use when a resident documents the CDS interaction without direct attending oversight in settings where applicable.
`QK`	Medical direction of two, three, or four concurrent anesthesia procedures involving qualified nonphysician anesthetists	Use when anesthesia medical direction is billed for the related imaging procedure.
`QX`	CRNA service: billing under an anesthesiologist’s NPI	Use when a certified registered nurse anesthetist provides anesthesia associated with the imaging procedure.

Taxonomy Code	Specialty	Notes
`208000000X`	Diagnostic Radiology	Radiologists order, supervise, and interpret imaging studies informed by CDS output.
`207RC0000X`	Emergency Medicine	Emergency physicians frequently use CDS for urgent imaging decisions (e.g., CT pulmonary angiography).
`207P00000X`	Internal Medicine	Hospitalists and primary care clinicians use CDS for outpatient imaging appropriateness.
`207Q00000X`	Cardiology	Cardiologists use CDS for cardiac imaging appropriateness (e.g., coronary CTA, stress testing decisions).
`363LP0200X`	Nurse Practitioner	Advanced practice clinicians who order imaging and document CDS interactions.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`I26.99`	Other pulmonary embolism without acute cor pulmonale	Common indication for chest CT angiography where CDS evaluates appropriateness.
`R07.9`	Chest pain, unspecified	Frequently prompts evaluation with imaging; CDS helps determine necessity of advanced imaging.
`I21.9`	Acute myocardial infarction, unspecified	Cardiac chest pain scenarios where coronary CTA appropriateness is assessed by CDS.
`R10.9`	Abdominal pain, unspecified	Triggers abdominal CT evaluation; CDS guides imaging choice and urgency.
`M54.2`	Cervicalgia	Indication for spine imaging where CDS assists in selecting MRI vs radiograph.
`R55`	Syncope and collapse	May prompt head or chest imaging; CDS evaluates appropriateness based on clinical context.
`G89.29`	Other chronic pain	Chronic pain evaluations where imaging appropriateness is reviewed by CDS.
`S06.0X0A`	Concussion without loss of consciousness, initial encounter	Trauma-related indication prompting head CT or MRI where CDS supports decision-making.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`71260`	CT chest without contrast material, with contrast material, and further sequences (for pulmonary embolism or other chest indications)	Commonly performed after a CDS determination supports chest CT for suspected pulmonary embolism or complex chest pathology.
`75574`	Computed tomography, heart, without contrast material followed by contrast material and further sequences, for evaluation of coronary arteries (coronary CTA)	Often preceded by a CDS consultation to confirm appropriateness for coronary CT angiography.
`74177`	CT abdomen and pelvis with contrast material, single or multiphase	Performed when CDS indicates abdominal imaging is appropriate for specified clinical indications.
`72191`	MRI cervical spine without contrast, followed by contrast when performed	Ordered when CDS supports advanced spinal imaging for acute neurologic signs or trauma.
`93000`	Electrocardiogram, routine ECG with at least 12 leads; with interpretation and report	May be performed before or after cardiac imaging that was evaluated via the CDS to inform appropriateness.