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[Coding and identification of heart failure]
M Bressan1, E Visentin, C Baratella
1Cattedra e Divisione di Cardiologia, Universita degli Studi, Padova.
Insights
Heart failure (HF) diagnosis prevalence varies significantly between the US and Italy due to inconsistent classification. Improved coding practices are essential for accurate international comparisons of HF prevalence.
Area of Science:
- Cardiology
- Medical Informatics
- Public Health
Context:
- Significant international disparities exist in reported heart failure (HF) prevalence rates, particularly when comparing data from the USA and Italy.
- The International Classification of Diseases, ninth revision (ICD-9) code 428 is used for HF diagnosis, but its application appears inconsistent across different healthcare systems.
Purpose:
- To investigate the reasons for observed differences in heart failure prevalence rates between the USA and Italy.
- To evaluate the accuracy and consistency of heart failure diagnosis coding using ICD-9 code 428.
- To assess the impact of diagnostic classification preferences on heart failure prevalence reporting.
Summary:
- A review of heart failure diagnoses at Padua General Hospital, Italy, revealed varying discharge rates between the general hospital (0.43%) and the Cardiology department (0.7%).
- Analysis of patient records using Boston criteria showed that only patients with definite or possible heart failure diagnoses were assigned code 428, with a significant portion of unlikely HF cases not using this code.
- Physicians may prioritize anatomical over functional classifications, focusing on left ventricular systolic function, which could influence diagnostic coding.
Impact:
- Highlights the need for standardized diagnostic criteria and improved coding practices to ensure accurate and comparable heart failure prevalence data globally.
- Suggests that anatomical descriptions of cardiac impairment may be preferred over functional assessments in diagnostic coding, impacting prevalence statistics.
- Emphasizes the critical importance of precise medical coding for reliable epidemiological research and healthcare policy development in cardiology.
Abstract:
The prevalence of the diagnosis of heart failure (HF) presents large differences, comparing the data of hospital discharge obtained from USA and Italy through te code 428 of ninth revision of International Classification of Diseases (ICD-9). As possibly the difference is related to classification, we reviewed homogeneous diagnosis in Padua General Hospital as a whole and the diagnosis at discharge in the department of Cardiology of the same hospital. Hospital HF discharge rate is on average 0.43% (0.37-0.51); while from department of Cardiology is on average 0.7% (0.15-0.85). Medical records of a group of patients (the first hundred of 1992) are analysed and recorded using the Boston criteria for scoring the certainty of HF diagnosis. The group with unlikely HF (68%) does'nt codes 428; there is 2 code 428 in group with possible (16%) and 2 in group with definite (16%) diagnosis of HF. The physician probably prefers sometimes an anatomical rather than a functional classification and therefore he underscores the impairment of left ventricular systolic function. A better code-use is needed before comparing prevalence rate from different centres.