Using CMS mapping files, the researchers identified five mapping motif categories: identity, class-to-subclass, subclass-to-class, convoluted and no mapping. Convoluted mappings represent the ICD-9 and ICD-10 codes that share multiple complex, entangled and non-reciprocal mappings, according to the report.
Overall, 36 percent of the codes include convoluted mappings, ranging from 5 percent of hematology to 60 percent of obstetrics and injuries. Twenty-seven percent of emergency department costs are linked to convoluted diagnoses.
The researchers corroborated the complexity of the transition to ICD-10-CM and concluded that “post-transition, successful management of frequent disease with convoluted mapping network patterns is critical,” according to the report.
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