Summary & Overview
HCPCS G8646: Completion of Asthma Measures Group
HCPCS Level II code G8646 denotes that all required quality actions for the asthma measures group have been completed for a patient. As a documentation and quality-reporting code, it signals full adherence to the set of asthma-specific performance measures used in clinical quality programs and value-based reporting. Nationally, such codes support quality measurement, reporting compliance, and program accountability across payers and provider networks.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what G8646 represents, where it is typically used, and why it matters for quality reporting and program monitoring. The publication outlines typical use cases, expected clinical context for asthma measure completion, and how the code fits into broader quality reporting workflows.
The piece provides practical reference material: a clear description of the code, the derived service type and typical site of service, payer scope, and the main themes readers should expect—benchmarks and reporting context, policy and program relevance, and clinical documentation considerations. Data not provided in the input (for example, modifiers, associated taxonomies, ICD-10 mappings, and related codes) are noted as unavailable and are not furnished here.
Billing Code Overview
HCPCS Level II code G8646 indicates that all quality actions for the applicable measures in the asthma measures group have been performed for this patient. This code documents completion of the full set of asthma-related quality measures applicable to an individual, reflecting comprehensive performance on the asthma care measures for that encounter or reporting period.
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Service type: Quality measure reporting / performance documentation
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Typical site of service: Ambulatory clinic or outpatient practice where asthma quality measures are assessed and reported
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is a pediatric or adult with diagnosed asthma attending a primary care, pulmonology, or allergy clinic for a chronic care visit or asthma follow-up. The clinician performs a comprehensive asthma quality assessment consistent with evidence-based measures: symptom control assessment, inhaler technique review, medication reconciliation, spacer prescription if indicated, asthma action plan provision, influenza vaccination counseling or administration, smoking cessation counseling if relevant, assessment of exacerbation history, and documentation of peak flow or spirometry results when available. The workflow includes chart review of prior visits and medications, structured interview for control and triggers, physical exam focused on respiratory status, device demonstration and return demonstration, completion or update of an individualized asthma action plan, and documentation of all required measure elements in the electronic health record. Once all applicable measures in the asthma measures group are completed and documented for that patient, the clinician or abstractor records the performance of all quality actions and assigns billing code G8646 to denote that all asthma measure elements were performed for the applicable measures in the reporting period.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service by the same physician on the same day of the procedure | When an E/M visit for asthma assessment is distinct from other services on the same day |
59 | Distinct procedural service | When another distinct service unrelated to the quality documentation is performed the same day |
52 | Reduced services | When a listed service is partially reduced or eliminated at physician discretion |
57 | Decision for surgery | Not commonly used but applicable when asthma assessment results lead directly to a surgical decision |
76 | Repeat procedure by same physician | When the asthma-related procedure or measurement is repeated within the global period |
77 | Repeat procedure by another physician | When a different physician repeats the asthma-related measurement |
78 | Unplanned return to the operating/procedure room by the same physician following initial procedure for a related procedure during the postoperative period | Rarely applicable; use only if a related unplanned procedure occurs |
24 | Unrelated E/M service by the same physician during a postoperative period | When an unrelated E/M visit occurs during a global postoperative period |
JW | Drug or biological amount discarded/not administered | When a portion of an administered medication (e.g., biologic for severe asthma) is discarded |
XE | Separate encounter — distinct from others on the same day | When the quality action encounter is separate from other services |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207Q00000X | Allergy & Immunology | Specialists who manage complex asthma care and perform comprehensive quality measures |
207RC0000X | Pulmonary Disease | Pulmonologists who assess control, perform spirometry, and optimize therapy |
208D00000X | Family Medicine | Primary care clinicians who perform routine asthma follow-up and quality documentation |
208000000X | Internal Medicine | Adult primary care physicians managing chronic asthma care |
261QF0400X | Respiratory Therapy | Respiratory therapists who perform spirometry, peak flow testing, and device education |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
J45.909 | Unspecified asthma, uncomplicated | Common primary diagnosis for asthma quality measure performance |
J45.901 | Unspecified asthma, with (acute) exacerbation | Relevant when assessment occurs during or after an exacerbation and quality actions address exacerbation prevention |
J45.902 | Unspecified asthma, with status asthmaticus | Relevant for patients with severe exacerbations requiring focused follow-up and comprehensive quality measures |
J45.20 | Mild intermittent asthma, uncomplicated | Used for baseline classification affecting management and quality documentation |
J45.30 | Mild persistent asthma, uncomplicated | Used to document severity and guide measure-based interventions |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
94010 | Bronchospasm evaluation; spirometry | Used to document objective lung function during asthma assessment and supports quality measure documentation |
94060 | Bronchodilation responsiveness, spirometry as in 94010, including pre- and post-bronchodilator measurements | Performed when assessing reversibility and control, often accompanying the asthma quality visit |
94640 | Pressurized or non-pressurized inhalation treatment for acute airway obstruction | Used when an acute administration of aerosolized medication is required during the visit |
99401 | Preventive medicine counseling and/or risk factor reduction intervention(s) — individual, 15 minutes | Used for counseling such as smoking cessation or self-management education documented as part of quality actions |
99072 | Additional supplies, materials, and clinical staff time over and above those usually included with the office visit, during specified conditions | Used when extra patient education materials or device supplies are provided during the asthma quality visit |