I51.3
Intracardiac thrombosis, not elsewhere classified
I51.3 (also written I513) is a billable ICD-10-CM diagnosis code for intracardiac thrombosis, not elsewhere classified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 10 codes in category I51 (Complications and ill-defined descriptions of heart disease). The Alphabetic Index lists it under 17 entries. Its coding notes include 1 Excludes1 entry and 11 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Hypertension with heart failure or certain other heart conditions is assigned to category I11, with an additional code for the heart condition, unless the provider documents they are unrelated.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
- intracardiac thrombosis as current complication following acute myocardial infarction (I23.6)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
- heart disease specified as rheumatic (I00-I09)
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, 2026Inclusion terms
Conditions classified to this code.
- Apical thrombosis (old)
- Atrial thrombosis (old)
- Auricular thrombosis (old)
- Mural thrombosis (old)
- Ventricular thrombosis (old)
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 17 entries
- Clot (blood), heart, not resulting in infarction
- Embolism (multiple) (paradoxical), cardiac, not resulting in infarction
- Embolism (multiple) (paradoxical), heart (fatty), not resulting in infarction
- Ischemia, ischemic, myocardium, myocardial (chronic or with a stated duration of over 4 weeks), acute, without myocardial infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), atrium, auricular, not resulting in infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), atrium, auricular, old
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), cardiac, not resulting in infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), cardiac, old
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), endocardial, not resulting in infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), heart (chamber), not resulting in infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), heart (chamber), old
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), intracardiac NEC (apical) (atrial) (auricular) (ventricular) (old)
Show 5 more
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), intramural, not resulting in infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), intramural, old
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), mural, not resulting in infarction
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), mural, old
- Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel), ventricle, old