Summary & Overview
HCPCS G1022: Intermountain Clinical Decision Support Mechanism
HCPCS Level II code G1022 designates a clinical decision support mechanism — the Intermountain clinical decision support mechanism — as defined by the Medicare Appropriate Use Criteria program. This code captures use of decision-support tools intended to apply appropriate-use criteria to clinical imaging decisions and related workflows. Nationally, use of such codes ties into efforts to improve imaging appropriateness, reduce unnecessary testing, and align clinician workflow with evidence-based criteria.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of what G1022 represents, typical service settings, and the relevance of the code to appropriateness-driven programs. The publication summarizes payer coverage considerations, common billing modifiers, and how the code fits into imaging appropriateness initiatives. It also outlines where to find policy updates and practical billing context for institutions and payers operating at a national level.
This briefing provides an executive-level view linking the clinical purpose of the code to payer and policy contexts, helping coding, compliance, and revenue teams understand the administrative and clinical framing of G1022 in national practice.
Billing Code Overview
HCPCS Level II code G1022 represents a clinical decision support mechanism specifically described as the Intermountain clinical decision support mechanism, as defined by the Medicare Appropriate Use Criteria program. The code denotes the use of a clinical decision support tool to apply appropriate use criteria in imaging or related decision-making workflows.
Service Type: Clinical decision support service
Typical Site of Service: Outpatient or facility-based settings where imaging appropriateness review or clinical decision support is applied, including hospitals, imaging centers, and outpatient clinics.
Clinical & Coding Specifications
Clinical Context
A patient undergoing outpatient diagnostic evaluation for chest pain or suspected acute coronary syndrome presents to a hospital-affiliated outpatient clinic or emergency department. The clinician orders imaging studies (such as CT or nuclear stress testing) and consults the electronic clinical decision support system that implements Medicare Appropriate Use Criteria. The system G1022 documents use of the Intermountain Clinical Decision Support Mechanism to query appropriateness criteria, returns guidance on test selection (for example, choosing between stress ECG, stress imaging, or coronary CT angiography), and generates a machine-readable record of the decision-support interaction. Typical site of service includes hospital outpatient departments, emergency departments, and ambulatory clinics integrated with hospital systems. A typical workflow: clinician enters the clinical indication and relevant ICD-10 diagnoses into the electronic health record, triggers the clinical decision support mechanism G1022, reviews the appropriateness output, documents the CDS interaction in the chart, and proceeds with ordering the selected imaging or procedure. This supports compliance with Medicare Appropriate Use Criteria requirements and creates an auditable record for billing and quality review.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|