What is the status of ICD-9 in MedDRA?
ICD-9© was not fully implemented in the original version of MedDRA 2.1, and what was implemented was not implemented consistently. Since ICD-9 is copyrighted by World Health Organization, the MedDRA Management Board agreed not to make any changes to ICD-9 codes in MedDRA. Some ICD-9 codes are assigned to several LLT codes or PT codes. Can you confirm that in these cases LLT and PT MedDRA codes are all identical to the ICD-9 code values, and different MedDRA code values will appear only at higher hierarchical MedDRA levels? One ICD-9 concept can be linked to multiple MedDRA terms at multiple levels. The user needs to be aware that equivalencies between the two (ICD-9 and MedDRA codes) are based on concepts and not string matches.
