I25.2 Old myocardial infarction

The ICD-10-CM code for Old myocardial infarction is I25.2 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

9: Diseases of the circulatory system (I00-I99)

Section

I20-I25: Ischemic heart diseases (I20-I25)

Category I25

70 codes (56 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to I25.2:

• Old (previous) myocardial infarction
• Scar, scarring › myocardium, myocardial
• Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › diagnosed on ECG, but presenting no symptoms
• Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › healed or old
• Occlusion, occluded › coronary (artery) (vein) (thrombotic) › healed or old
• Infarct, infarction › myocardium, myocardial (acute) (with stated duration of 4 weeks or less) › past (diagnosed on ECG or other investigation, but currently presenting no symptoms)
• History › personal (of) › myocardial infarction (old)
• Occlusion, occluded › artery › coronary (acute) (thrombotic) (without myocardial infarction) › healed or old

Inclusion Terms

• Healed myocardial infarction
• Past myocardial infarction diagnosed by ECG or other investigation, but currently presenting no symptoms

U.S. Hospital Utilization

• An estimated 1,495,500 U.S. inpatient stays in 2023 included I25.2 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Report I21 within 4 weeks; aftercare after; I25.2 for old/healed

For encounters occurring while the myocardial infarction is equal to, or less than, four weeks old, including transfers to another acute setting or a postacute setting, and the myocardial infarction meets the definition for “other diagnoses” (see Section III, Reporting Additional Diagnoses), codes from category I21 may continue to be reported. For encounters after the 4-week time frame and the patient is still receiving care related to the myocardial infarction, the appropriate aftercare code should be assigned, rather than a code from category I21. For old or healed myocardial infarctions not requiring further care, code I25.2, Old myocardial infarction, may be assigned.

Presumed relationship due to Index term “with”

The classification presumes a causal relationship between hypertension and heart involvement and between hypertension and kidney involvement, as the two conditions are linked by the term “with” in the Alphabetic Index. These conditions should be coded as related even in the absence of provider documentation explicitly linking them, unless the documentation clearly states the conditions are unrelated.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)