Convert ICD-9-CM Diagnosis 999.0 to ICD-10-CM

ICD-9-CM 999.0 converts approximately to:
  • 2021 ICD-10-CM T88.1XXA Other complications following immunization, not elsewhere classified, initial encounter

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.