I24.0
Acute coronary thrombosis not resulting in myocardial infarction
I24.0 (also written I240) is a billable ICD-10-CM diagnosis code for acute coronary thrombosis not resulting in myocardial infarction. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 5 codes in category I24 (Other acute ischemic heart diseases). The Alphabetic Index lists it under 7 entries. Its coding notes include a Code also instruction, 3 Excludes1 entries and 11 Excludes2 entries.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
- atherosclerotic heart disease (I25.1-)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- 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.-)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Cardiac and Circulatory clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Hospital CC
Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 48 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.
Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix CInclusion terms
Conditions classified to this code.
- Acute coronary (artery) (vein) embolism not resulting in myocardial infarction
- Acute coronary (artery) (vein) occlusion not resulting in myocardial infarction
- Acute coronary (artery) (vein) thromboembolism not resulting in myocardial infarction
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 7 entries
- Embolism (multiple) (paradoxical), artery, coronary, not resulting in infarction
- Occlusion, occluded, artery, coronary (acute) (thrombotic) (without myocardial infarction)
- Occlusion, occluded, coronary (artery) (vein) (thrombotic), not resulting in infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), artery, arteries (postinfectional), coronary, not resulting in infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), coronary (artery) (vein), not resulting in infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), parietal, not resulting in infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), ventricle, not resulting in infarction