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Home/Diagnosis/ICD-10 Coding for Non-ST Elevation Myocardial Infarction

ICD-10 Coding for Non-ST Elevation Myocardial Infarction

I21.4
I21.A1
I22.2

Complete ICD-10-CM coding and documentation guide for icd-10 coding for non-st elevation myocardial infarction includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
NSTEMI
Non-STEMI
Subendocardial Myocardial Infarction
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Key Information: ICD-10 Coding for Non-ST Elevation Myocardial Infarction

Essential facts and insights about ICD-10 Coding for Non-ST Elevation Myocardial Infarction

Use ICD-10 code I21.4 for non-st elevation (nstemi) myocardial infarction, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Non-ST elevation (NSTEMI) myocardial infarction

Billable Code
I21.4
Billable

Diagnostic Criteria

clinical:
  • • Elevated troponin and no ST elevation on ECG
documentation:
  • • Explicit mention of NSTEMI

Applicable To

  • • Subendocardial myocardial infarction
  • • Non-transmural myocardial infarction

Important Notes

  • • Ensure explicit documentation of NSTEMI to avoid misclassification.

Myocardial infarction type 2

Billable Code
I21.A1
Billable

Diagnostic Criteria

clinical:
  • • Documentation of underlying cause
  • • Troponin elevation

Applicable To

  • • Demand ischemia

Important Notes

  • • Ensure causal relationship is documented.

Subsequent non-ST elevation (NSTEMI) myocardial infarction

Billable Code
I22.2
Billable

Diagnostic Criteria

clinical:
  • • Documentation of prior MI within 28 days
  • • Elevated troponin levels

Applicable To

  • • Recurrent NSTEMI within 28 days

Important Notes

  • • Ensure correct sequencing with initial MI code.
Ancillary Codes

Additional codes that may be used with this diagnosis

I25.2

Old myocardial infarction

Use for historical MI documentation.

Frequently Asked Questions

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.

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