I21.4 is a billable ICD code used to specify a diagnosis of non-ST elevation (NSTEMI) myocardial infarction. A 'billable code' is detailed enough to be used to specify a medical diagnosis.
ICD-10-CM I21. 4 converts approximately to: 2015 ICD-9-CM 410.71 Subendocardial infarction, initial episode of care.
Full
AnswerThe ICD code I21 is used to code Coronary artery disease
Coronary artery disease (CAD), also known as ischemic heart disease (IHD), is a group of diseases that includes: stable angina, unstable angina, myocardial infarction, and sudden coronary death. It is within the group of cardiovascular diseases of which it is the most common type.
Coding Notes for I21.4 Info for medical coders on how to properly use this ICD-10 code
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
MS-DRG Mapping
DRG Group #222-227 - Cardiac defibrillator implant with cardiac catheterization with ami or hf or shock with MCC.
ICD-10-CM Alphabetical Index References for 'I21.4 - Non-ST elevation (NSTEMI) myocardial infarction'
The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code I21.4. Click on any term below to browse the alphabetical index.
Equivalent ICD-9 Code GENERAL EQUIVALENCE MAPPINGS (GEM)
This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code I21.4 and a single ICD9 code, 410.71 is an approximate match for comparison and conversion purposes.
Subsequent Heart Attacks
What is a “subsequent” myocardial infarction? An Inclusion note in the Tabular, category I22 Subsequent ST elevation (STEMI) and non-STE explains that it is an “acute myocardial infarction occurring within four weeks (28 days) of a previous acute myocardial infarction, regardless of site.”
Evolving Guidelines
If you have been coding inpatient records since the implementation of ICD-10-CM, you may have noticed that the OCG for Subsequent acute myocardial infarctions has been evolving. For codes effective October 1, 2018 (last year), additions were made to this guideline referring to Type 2 myocardial infarctions for the first time.
Codes in Action
Example 1: A patient is admitted and discharged with a Type 1 STEMI involving the right coronary artery. Two weeks later, the same patient is admitted for treatment of a Type 2 myocardial infarction. The Type 1 STEMI is still under treatment.
What is the ICD-10 code for non ST elevation?
I21.4 is a valid billable ICD-10 diagnosis code for Non-ST elevation (NSTEMI) myocardial infarction . It is found in the 2021 version of the ICD-10 Clinical Modification (CM) and can be used in all HIPAA-covered transactions from Oct 01, 2020 - Sep 30, 2021 .
Do you include decimal points in ICD-10?
DO NOT include the decimal point when electronically filing claims as it may be rejected. Some clearinghouses may remove it for you but to avoid having a rejected claim due to an invalid ICD-10 code, do not include the decimal point when submitting claims electronically. See also: Infarct, infarction.
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