I21.29

ST elevation (STEMI) myocardial infarction involving other sites

Risk-adjusting (HCC)Billable code

HCC risk adjustment mapping

CMS-HCC V28

HCC228

Acute Myocardial Infarction

CMS-HCC ESRD V24

HCC86

Acute Myocardial Infarction

RxHCC V08

RXHCC188

Coronary Artery Disease

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · I21.29
Synonyms

Acute transmural myocardial infarction of other sites Apical-lateral transmural (Q wave) infarction (acute) Basal-lateral transmural (Q wave) infarction (acute) High lateral transmural (Q wave) infarction (acute) Lateral (wall) NOS transmural (Q wave) infarction (acute) Posterior (true) transmural (Q wave) infarction (acute) Posterobasal transmural (Q wave) infarction (acute) Posterolateral transmural (Q wave) infarction (acute) Posteroseptal transmural (Q wave) infarction (acute) Septal transmural (Q wave) infarction (acute) NOS

Inherited from I21.2ST elevation (STEMI) myocardial infarction of other sites
Synonyms

Type 1 ST elevation myocardial infarction of other sites

Inherited from I21Acute myocardial infarction
Includes

cardiac infarction coronary (artery) embolism coronary (artery) occlusion coronary (artery) rupture coronary (artery) thrombosis infarction of heart, myocardium, or ventricle myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset

Excludes 2

old myocardial infarction (I25.2) postmyocardial infarction syndrome (I24.1) subsequent type 1 myocardial infarction (I22.-)

Use additional

code, if applicable, to identify: exposure to environmental tobacco smoke (Z77.22) history of tobacco dependence (Z87.891) occupational exposure to environmental tobacco smoke (Z57.31) status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82) tobacco dependence (F17.-) tobacco use (Z72.0)

Inherited from I20-I25Ischemic heart diseases
Code also

the presence of hypertension (I10-I1A)

Inherited from chapter 9Diseases of the circulatory system
Excludes 2

certain conditions originating in the perinatal period (P04-P96) certain infectious and parasitic diseases (A00-B99) complications of pregnancy, childbirth and the puerperium (O00-O9A) congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) endocrine, nutritional and metabolic diseases (E00-E88) injury, poisoning and certain other consequences of external causes (S00-T88) neoplasms (C00-D49) symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) systemic connective tissue disorders (M30-M36) transient cerebral ischemic attacks and related syndromes (G45.-)

Official Guidelines for I21.29

FY 2026 ›