Summary & Overview
HCPCS G8855: Adherence to Therapy Not Assessed, Reason Not Given
HCPCS Level II code G8855 documents that a patient’s adherence to a prescribed therapy was not assessed at least annually via an objective informatics system or self-reporting when objective reporting is unavailable, without a stated reason. Nationally, this code matters for quality measurement, care coordination, and reporting completeness; it flags instances where routine adherence monitoring was not recorded and can affect quality metrics and program evaluations. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will learn what G8855 represents in clinical and administrative workflows, the settings where it is typically used, and which major payers accept or track the code. The publication covers benchmarks and reporting implications for adherence assessment documentation, relevant policy and quality reporting considerations, and clinical context for why annual adherence assessment is tracked. Data not available in the input will be noted where applicable.
Billing Code Overview
HCPCS Level II code G8855 indicates that adherence to therapy was not assessed at least annually through an objective informatics system or through self-reporting (if objective reporting is not available), reason not given. This code documents a lack of documented annual assessment of patient adherence to a prescribed therapy.
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Service Type: Assessment/Quality Measurement — documentation of adherence assessment status
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Typical Site of Service: Outpatient or ambulatory care settings where ongoing therapy management and quality reporting occur
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Clinical & Coding Specifications
Clinical Context
A typical patient is a 62-year-old with chronic obstructive pulmonary disease managed with inhaled controller therapy who presents for a routine follow-up at a primary care clinic. The clinician documents medication reconciliation and notes the patient reports variable adherence; the clinic lacks an integrated pharmacy refill or electronic medication monitoring feed. Per quality reporting requirements, adherence to therapy must be assessed at least annually using an objective informatics system (for example, electronic pharmacy refill data or an inhaler sensor system) or by documented patient self-report when objective reporting is not available. The workflow includes medication list review, structured patient interview about missed doses and barriers, documentation of self-reported adherence in the electronic health record, and coding for quality measure non‑compliance when a required annual objective or self‑report assessment is not documented and no reason is recorded. The service is administrative/quality measure reporting rather than direct patient treatment and is typically billed by outpatient primary care, pulmonary, or family medicine practices during ambulatory visits or chronic care management encounters. Typical site of service is an outpatient clinic or physician office. Common scenario details: patient encounter note includes diagnosis (for example, COPD), medication list, but lacks an annual objective adherence check or documented self-report and no reason is recorded; coder assigns G8855 per billing rules to indicate adherence assessment was not performed and reason not given.
Coding Specifications
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