Yes, there are duplicate code in ICD-10 and ICD-9 but with different meaning, reason being in ICD-9 there E and V codes are alpha-numeric and ICD-10 codes are also alpha-numeric. For example- in ICD-10 E88.01 is Alpha-1-antitrypsin deficiency but same code in ICD-9 is E880.1-Accidental fall on or from sidewalk curb and there are differences in the place of decimals.
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yes. there are approximately 38 codes that are used in ICD-9 and reused in icd-10 but with very different meanings