I51Complications and ill-defined descriptions of heart disease
Code usage status
Primary diagnosis
Select a more specific code
Apply only when it matches the confirmed diagnosis and the documented clinical record.
Specificity
Do not use I51 directly
Use the most specific code supported by the record.
- Chapter IX
- Diseases of the circulatory system
- Group I30-I52
- Other forms of heart disease
- Official Vietnamese name
- Biến chứng tim và/hoặc bệnh tim mô tả không rõ ràng
- Additional WHO coding guidance
- Excl.: any condition in I51.4-I51.9 due to hypertension (I11.-) any condition in I51.4- I51.9 due to hypertension with renal disease (I13.-) complications following acute myocardial infarction (I23.-) when specified as rheumatic (I00-I09)
Related I51 codes
I51.0
Primary diagnosis candidate
Cardiac septal defect, acquired
I51.1
Primary diagnosis candidate
Rupture of chordae tendineae, not elsewhere classified
I51.2
Primary diagnosis candidate
Rupture of papillary muscle, not elsewhere classified
I51.3
Primary diagnosis candidate
Intracardiac thrombosis, not elsewhere classified
I51.4
Primary diagnosis candidate
Myocarditis, unspecified
I51.5
Primary diagnosis candidate
Myocardial degeneration
I51.6
Primary diagnosis candidate
Cardiovascular disease, unspecified
I51.7
Primary diagnosis candidate
Cardiomegaly
I51.8
Primary diagnosis candidate
Other ill-defined heart diseases
I51.9
Primary diagnosis candidate
Heart disease, unspecified
Clinical record checklist
View coding guide →- Confirm that the code matches the final documented diagnosis.
- Use one primary-diagnosis code and record only relevant additional conditions.
- Review Ministry indicators, inclusions, exclusions and notes.
- Do not infer a diagnosis beyond the clinical record.
2026 regulatory basis
Indicators are taken from columns 24–29 of the classification accompanying Circular 06/2026/TT-BYT, cross-referenced with Decision 1849/QĐ-BYT and Official Dispatch 4059/BYT-BH.
