2024 ICD-10-CM Diagnosis Code Y84.9

Medical procedure, unspecified as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure

ICD-10-CM Code:
Y84.9
ICD-10 Code for:
Medical procedure, unsp cause abn react/compl, w/o misadvnt
Is Billable?
Yes - Valid for Submission
Code Navigator:

Code Classification

  • External causes of morbidity and mortality
    (V01–Y99)
    • Complications of medical and surgical care
      (Y62-Y84)
      • Other medical procedures as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure
        (Y84)

Y84.9 is a billable diagnosis code used to specify a medical diagnosis of medical procedure, unspecified as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like Y84.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Left vestibulopathy following medical intervention
  • Postprocedural inferior vena cava complication
  • Right vestibulopathy following medical intervention
  • Therapy related acute myeloid leukemia and myelodysplastic syndrome
  • Therapy-related myelodysplastic syndrome

Clinical Classification

Index of External Cause of Injuries

References found for this diagnosis code in the External Cause of Injuries Index:

    • Accident(to)
      • in
        • medical, surgical procedure
          • causing an abnormal reaction or later complication without mention of misadventure
    • Complication(delayed) of or following (medical or surgical procedure)
    • Reaction, abnormal to medical procedure

Convert Y84.9 to ICD-9-CM

  • ICD-9-CM Code: E878.9 - Abn react-surg proc NOS
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.