AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2025 Issue 4; New/Revised ICD-10-CM Codes
Poisoning, Adverse Effect, and Underdosing of Fluoroquinolones
Subcategory T36.AX, Poisoning by, adverse effect of and underdosing of fluoroquinolone antibiotics, has been created to capture the effects of fluoroquinolones (FQs).FQs are a broad spectrum of systemic antibacterial agents, that are widely used as therapeutic treatment for respiratory and urinary tract infections, as well as other bacterial diseases of the eyes, skin, and lungs. Although effective in the treatment of severe life-threatening infections, FQs are associated with a variety of systemic and adverse side effects. Some of the disabling side effects affect muscles, joints, and the central nervous system, including agitation, tremor, hallucinations, psychosis and convulsions...
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Article Overview
This article reviews a new ICD-10-CM subcategory focused on fluoroquinolone antibiotics and the circumstances under which related effects are classified. It is relevant to coders, CDI specialists, and compliance teams who work with adverse drug events, poisoning reports, and underdosing documentation. The discussion covers the clinical context for fluoroquinolone use, the types of effects addressed by the new subcategory, and the general structure of the newly added codes and episode-of-care reporting.
Why This Topic Matters
Fluoroquinolones are widely used, and this update clarifies how related medication events are organized within ICD-10-CM. Understanding the scope of the new subcategory helps support consistent documentation review and reporting for drug-related encounters.
Article Sections
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Overview of fluoroquinolones and related effects
This section introduces fluoroquinolone antibiotics and summarizes the broad clinical context for the coding update. It also notes the general categories of effects associated with these medications.
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New ICD-10-CM codes
This section presents the newly created code group for fluoroquinolone-related reporting. It identifies the circumstances covered by the subcategory and notes the role of episode-of-care reporting.
What You Will Learn
- How the article frames fluoroquinolone-related medication events in ICD-10-CM
- What broad clinical situations are addressed by the new subcategory
- How the article organizes the newly introduced code group at a high level
- Why episode-of-care information is part of the reporting structure
Who Should Read This
- Medical coders
- Clinical documentation integrity specialists
- Compliance professionals
- Revenue cycle staff
- Healthcare auditors
Codes Discussed
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