Practise vocabulary for clinical coding systems: ICD-10 diagnoses, SNOMED CT clinical terms, and LOINC laboratory codes.
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ICD-10 codes are used for:
ICD-10 (International Classification of Diseases, 10th revision) is the global standard for diagnosis coding. ICD-10-CM is the US clinical modification. Structure: letter (chapter) + 2 digits (category) + decimal + specificity. Used for billing (claims require ICD codes), epidemiology, and mortality statistics.
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SNOMED CT (Systematized Nomenclature of Medicine — Clinical Terms) differs from ICD-10 in that:
ICD-10 = billing classification (finite, flat categories); SNOMED CT = clinical terminology (350,000+ concepts with hierarchical relationships and attributes). Example SNOMED: '22298006 | Myocardial infarction' with 'Is a' relationships to parent concepts. Used in clinical decision support and clinical note encoding.
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LOINC codes are used to identify:
LOINC (Logical Observation Identifiers Names and Codes): 6-part axis: Component (what was measured), Property (kind of quantity), Time, System (specimen), Scale, Method. Example: 2160-0 = Creatinine measured in serum/plasma using enzymatic method. LOINC enables unambiguous lab result exchange.
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The phrase 'this encounter is coded with J18.9 as the principal diagnosis' means:
Principal diagnosis = the condition established to be chiefly responsible for the admission/visit. For inpatient claims, the principal diagnosis drives DRG assignment and reimbursement. J18.9 is commonly used when the specific pneumonia type (bacterial, viral) has not been identified.
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In FHIR, 'terminology binding' to ICD-10 or SNOMED CT is described as 'required' when:
FHIR binding strengths: Required (only codes from the value set), Extensible (codes from value set preferred; may extend if needed), Preferred (value set recommended but alternatives allowed), Example (value set is illustrative only). Required binding is used for internationally standardised coded fields.