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ICD-10-CM Codes
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I00-I99
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I20-I25
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I21-
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2023 ICD-10-CM Diagnosis Code I21.21
2023 ICD-10-CM Diagnosis Code I21.21
ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
- I21.21 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- Short description: STEMI involving left circumflex coronary artery
- The 2023 edition of ICD-10-CM I21.21 became effective on October 1, 2022.
- This is the American ICD-10-CM version of I21.21 - other international versions of ICD-10 I21.21 may differ.
Applicable To- ST elevation (STEMI) myocardial infarction involving oblique marginal coronary artery
The following code(s) above
I21.21 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
- Applicable To annotations, or
- Code Also annotations, or
- Code First annotations, or
- Excludes1 annotations, or
- Excludes2 annotations, or
- Includes annotations, or
- Note annotations, or
- Use Additional annotations
that may be applicable to
I21.21:
- I00-I99
2023 ICD-10-CM Range I00-I99
Diseases of the circulatory systemType 2 Excludes- 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.-)
- I20-I25
2023 ICD-10-CM Range I20-I25
Ischemic heart diseasesCode Also- the presence of hypertension (I10-I16)
- I21
ICD-10-CM Diagnosis Code I21
Acute myocardial infarction
2016 2017 2018 - Revised Code 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
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
Type 2 Excludes- 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)
- I21.2
ICD-10-CM Diagnosis Code I21.2
ST elevation (STEMI) myocardial infarction of other sites
2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
Applicable To- Type 1 ST elevation myocardial infarction of other sites
- Acute heart attack, left circumflex coronary artery
- Acute st segment elevation myocardial infarction due to occlusion of left circumflex coronary artery
ICD-10-CM I21.21 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):
- 222 Cardiac defibrillator implant with cardiac catheterization with ami, hf or shock with mcc
- 223 Cardiac defibrillator implant with cardiac catheterization with ami, hf or shock without mcc
- 280 Acute myocardial infarction, discharged alive with mcc
- 281 Acute myocardial infarction, discharged alive with cc
- 282 Acute myocardial infarction, discharged alive without cc/mcc
- 283 Acute myocardial infarction, expired with mcc
- 284 Acute myocardial infarction, expired with cc
- 285 Acute myocardial infarction, expired without cc/mcc
Convert I21.21 to ICD-9-CM
Code History
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 2017 (effective 10/1/2016): No change
- 2018 (effective 10/1/2017): No change
- 2019 (effective 10/1/2018): No change
- 2020 (effective 10/1/2019): No change
- 2021 (effective 10/1/2020): No change
- 2022 (effective 10/1/2021): No change
- 2023 (effective 10/1/2022): No change
Code annotations containing back-references to I21.21:
- Infarct, infarction
- myocardium, myocardial (acute) (with stated duration of 4 weeks or less) I21.9
ICD-10-CM Diagnosis Code I21.9
Acute myocardial infarction, unspecified
2018 - New Code 2019 2020 2021 2022 2023 Billable/Specific Code
Applicable To- Myocardial infarction (acute) NOS
- ST elevation (STEMI) I21.3
ICD-10-CM Diagnosis Code I21.3
ST elevation (STEMI) myocardial infarction of unspecified site
2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Applicable To- Acute transmural myocardial infarction of unspecified site
- Transmural (Q wave) myocardial infarction NOS
- Type 1 ST elevation myocardial infarction of unspecified site
- involving
- left circumflex coronary artery I21.21
- oblique marginal coronary artery I21.21
ICD-10-CM Codes Adjacent To I21.21
I20.9 Angina pectoris, unspecified
I21 Acute myocardial infarction
I21.0 ST elevation (STEMI) myocardial infarction of anterior wall
I21.01 ST elevation (STEMI) myocardial infarction involving left main coronary artery
I21.02 ST elevation (STEMI) myocardial infarction involving left anterior descending coronary artery
I21.09 ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wall
I21.1 ST elevation (STEMI) myocardial infarction of inferior wall
I21.11 ST elevation (STEMI) myocardial infarction involving right coronary artery
I21.19 ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wall
I21.2 ST elevation (STEMI) myocardial infarction of other sites
I21.21
ST elevation (STEMI) myocardial infarction involving left circumflex coronary artery
I21.29 ST elevation (STEMI) myocardial infarction involving other sites
I21.3 ST elevation (STEMI) myocardial infarction of unspecified site
I21.4 Non-ST elevation (NSTEMI) myocardial infarction
I21.9 Acute myocardial infarction, unspecified
I21.A Other type of myocardial infarction
I21.A1 Myocardial infarction type 2
I21.A9 Other myocardial infarction type
I22 Subsequent ST elevation (STEMI) and non-ST elevation (NSTEMI) myocardial infarction
I22.0 Subsequent ST elevation (STEMI) myocardial infarction of anterior wall
I22.1 Subsequent ST elevation (STEMI) myocardial infarction of inferior wall
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
