What is the ICD-10 code for non-ST elevation myocardial infarction?

The ICD-10 code for non-ST elevation myocardial infarction (NSTEMI) is I21.4, used when NSTEMI is explicitly documented with elevated troponin and no ST elevation on ECG.

How do you code a subsequent NSTEMI?

For a subsequent NSTEMI occurring within 28 days of a previous MI, use code I22.2, sequenced after the initial MI code.

ICD-10 Coding for Non-ST Elevation Myocardial Infarction(I21.4, E11.9, I21.9)

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Learn about ICD-10 coding for non-ST elevation myocardial infarction (NSTEMI), including primary codes, documentation requirements, and common pitfalls.

Also known as:

NSTEMINon-STEMISubendocardial Myocardial Infarction

Related ICD-10 Code Ranges

Complete code families applicable to Non-ST Elevation Myocardial Infarction

I00-I99Primary Range

Diseases of the circulatory system

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Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
I21.4	Non-ST elevation (NSTEMI) myocardial infarction	Use when NSTEMI is explicitly documented with elevated troponin and no ST elevation on ECG.	Elevated troponin levels Absence of ST elevation on ECG
I21.A1	Myocardial infarction type 2	Use when MI is secondary to another condition causing an imbalance in oxygen supply and demand.	Documentation of underlying cause Troponin elevation
I22.2	Subsequent non-ST elevation (NSTEMI) myocardial infarction	Use for NSTEMI occurring within 28 days of a previous MI.	Documentation of prior MI within 28 days Elevated troponin levels

Primary ICD-10-CM Codes

Non-ST elevation (NSTEMI) myocardial infarction

I21.4Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Acute myocardial infarction, unspecifiedI21.9

Documentation & Coding Risks

Avoid these common issues when documenting Non-ST Elevation Myocardial Infarction.

Failure to document MI type

Impact

Clinical: Inaccurate treatment plans., Regulatory: Non-compliance with coding standards., Financial: Potential claim denials.

Mitigation

Educate clinicians on documentation requirements., Use templates to ensure completeness.

Misclassifying Type 2 MI as NSTEMI

Impact

Reimbursement: Incorrect coding may lead to denied claims., Compliance: Non-compliance with coding guidelines., Data Quality: Inaccurate clinical data representation.

Mitigation

Ensure documentation specifies Type 2 MI and underlying cause.

Incorrect sequencing of subsequent MI codes

Impact

Reimbursement: Incorrect DRG assignment., Compliance: Violation of coding rules., Data Quality: Misleading patient history.

Mitigation

Always sequence I22.2 after the initial MI code.

Incorrect MI Type Coding

Impact

Risk of coding NSTEMI when Type 2 MI is present.

Mitigation

Implement regular training and audits.

Frequently Asked Questions

Documentation requirements, coding pitfalls and FAQs for conditions coded with I21.4.

Primary Code

I21.4

Non-ST elevation (NSTEMI) myocardial infarction

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ICD-10 codes5

Coding risks4

FAQs2

ICD-10 Coding for Non-ST Elevation Myocardial Infarction(I21.4, E11.9, I21.9)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for non-ST elevation myocardial infarction?

How do you code a subsequent NSTEMI?

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