2021 ICD-10-CM Code I99.9

Unspecified disorder of circulatory system

Version 2021
Billable Code
Unspecified Code
MS-DRG Mapping

Valid for Submission

I99.9 is a billable diagnosis code used to specify a medical diagnosis of unspecified disorder of circulatory system. The code I99.9 is valid during the fiscal year 2021 from October 01, 2020 through September 30, 2021 for the submission of HIPAA-covered transactions.

The ICD-10-CM code I99.9 might also be used to specify conditions or terms like acute disease of cardiovascular system, cardiovascular abnormality due to anomalous origin of arterial duct, cardiovascular abnormality due to anomalous origin of coronary artery from pulmonary artery, cardiovascular abnormality due to anomalous origin of coronary artery orifice, cardiovascular abnormality due to bilateral arterial ducts , cardiovascular abnormality due to infective myocarditis, etc.

Unspecified diagnosis codes like I99.9 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.

ICD-10:I99.9
Short Description:Unspecified disorder of circulatory system
Long Description:Unspecified disorder of circulatory system

Code Classification

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code I99.9 are found in the index:

Approximate Synonyms

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

Convert I99.9 to ICD-9 Code

The General Equivalency Mapping (GEM) crosswalk indicates an approximate mapping between the ICD-10 code I99.9 its ICD-9 equivalent. The approximate mapping means there is not an exact match between the ICD-10 code and the ICD-9 code and the mapped code is not a precise representation of the original code.

Code History

  • 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 (First year ICD-10-CM implemented into the HIPAA code set)