Convert ICD-10-CM T65.821A to ICD-9-CM

T65.821A can be converted to ICD-9-CM using the following scenario:
Scenario 1
  • 2015 ICD-9-CM 989.89 Toxic effect of other substance, chiefly nonmedicinal as to source, not elsewhere classified
  • With:
  • 2015 ICD-9-CM E928.6 Environmental exposure to harmful algae and toxins

Note: approximate conversions between ICD-9-CM codes and ICD-10-CM codes may require clinical interpretation in order to determine the most appropriate conversion code(s) for your specific coding situation.

Source: 2021 ICD-10-CM CMS General Equivalence Mappings.