AHA Coding Clinic® for ICD-9 - 2008 Issue 4; VOLUMES 1 AND 2 NEW/REVISED CODES
Heparin-Induced Thrombocytopenia (HIT)
Effective October 1, 2008, a new code 289.84, Heparin-induced thrombocytopenia (HIT), has been created to distinguish HIT from other drug-induced thrombocytopenias. Heparin is one of the most frequently prescribed medications with 12,000,000 patients having some heparin exposure in U.S. hospitals annually. Heparin usage can lead to one of the most important and devastating adverse reactions that can confront physicians, HIT. HIT is a distinct and relatively common life-threatening clinical entity that will occur in 3-5% of all patients receiving unfractionated heparin for at least 5 days. It is a humoral immune-mediated reaction causing an abrupt...
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Article Overview
This article covers a coding update effective October 1, 2008, focused on heparin-induced thrombocytopenia (HIT) and its distinction from other thrombocytopenic conditions. It is relevant to coders, compliance staff, clinical documentation teams, and clinicians who need to understand the affected ICD-9-CM category structure, related excludes notes, and associated references. The content also provides general clinical background on HIT to explain why the new diagnosis code was introduced.
Why This Topic Matters
The article helps readers recognize a specific diagnosis update and understand how it fits into the broader blood-disorder code family. It is useful for accurate record classification, documentation review, and awareness of related category notes that may affect code selection.
What You Will Learn
- The purpose of the ICD-9-CM update for heparin-induced thrombocytopenia
- How HIT is distinguished from other drug-induced thrombocytopenias at a high level
- Where the new diagnosis code fits within the surrounding blood disorder category
- What related excludes and cross-references are shown with the affected code family
Who Should Read This
- Medical coders
- Coding auditors
- Compliance staff
- Clinical documentation specialists
- Physicians and clinical staff
Codes Discussed
Code Ranges Discussed
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