ICD-10-CM 2027
ICD-10 code for heart organic disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › heart (organic)”. Page updated September 29, 2026.
About coding heart organic disease
The ICD-10-CM code for heart organic disease is I51.9 (Heart disease, unspecified). The official index lists 51 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I51.9.
Within I51, choose I51.9 (Heart disease, unspecified) only when documentation doesn't support a more specific option: cardiac septal defect, acquired (I51.0), rupture of chordae tendineae, not elsewhere classified (I51.1), rupture of papillary muscle, not elsewhere classified (I51.2), intracardiac thrombosis, not elsewhere classified (I51.3), myocarditis, unspecified (I51.4), myocardial degeneration (I51.5), Cardiomegaly (I51.7) and other ill-defined heart diseases (I51.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 302 (Atherosclerosis with MCC, relative weight 1.1984) and DRG 303 (Atherosclerosis without MCC, relative weight 0.6612), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific heart organic disease codes (official index)
- with
- pulmonary edema (acute) I50.1 — Left ventricular failure, unspecified
- rheumatic fever (conditions in I00)
- active I01.9 — Acute rheumatic heart disease, unspecified
- with chorea I02.0 — Rheumatic chorea with heart involvement
- specified NEC I01.8 — Other acute rheumatic heart disease
- inactive or quiescent (with chorea) I09.9 — Rheumatic heart disease, unspecified
- specified NEC I09.89 — Other specified rheumatic heart diseases
- amyloid E85.4 — Organ-limited amyloidosis
- aortic (valve) I35.9 — Nonrheumatic aortic valve disorder, unspecified
- arteriosclerotic or sclerotic (senile)
- artery, arterial
- beer drinkers' I42.6 — Alcoholic cardiomyopathy
- beriberi (wet) E51.12 — Wet beriberi
- black I27.0 — Primary pulmonary hypertension
- congenital Q24.9 — Congenital malformation of heart, unspecified
- cyanotic Q24.9 — Congenital malformation of heart, unspecified
- specified NEC Q24.8 — Other specified congenital malformations of heart
- coronary
- cryptogenic I51.9 — Heart disease, unspecified
- fibroid
- functional I51.89 — Other ill-defined heart diseases
- psychogenic F45.8 — Other somatoform disorders
- glycogen storage E74.02 — Pompe disease
- gonococcal A54.83 — Gonococcal heart infection
- hypertensive
- hyperthyroid E05.90 — Thyrotoxicosis, unspecified without thyrotoxic crisis or storm
- with thyroid storm E05.91 — Thyrotoxicosis, unspecified with thyrotoxic crisis or storm
- ischemic (chronic or with a stated duration of over 4 weeks) I25.9 — Chronic ischemic heart disease, unspecified
- atherosclerotic (of) I25.10 — Atherosclerotic heart disease of native coronary artery without angina pectoris
- with angina pectoris
- coronary artery bypass graft
- cardiomyopathy I25.5 — Ischemic cardiomyopathy
- diagnosed on ECG or other special investigation, but currently presenting no symptoms I25.6 — Silent myocardial ischemia
- silent I25.6 — Silent myocardial ischemia
- specified form NEC
- acute I24.89 — Other forms of acute ischemic heart disease
- chronic I25.89 — Other forms of chronic ischemic heart disease
- kyphoscoliotic I27.1 — Kyphoscoliotic heart disease
- meningococcal A39.50 — Meningococcal carditis, unspecified
- endocarditis A39.51 — Meningococcal endocarditis
- myocarditis A39.52 — Meningococcal myocarditis
- pericarditis A39.53 — Meningococcal pericarditis
- mitral I05.9 — Rheumatic mitral valve disease, unspecified
- specified NEC I05.8 — Other rheumatic mitral valve diseases
- muscular
- psychogenic (functional) F45.8 — Other somatoform disorders
- pulmonary (chronic) I27.9 — Pulmonary heart disease, unspecified
- in schistosomiasis B65.9 — Schistosomiasis, unspecified
- specified NEC I27.89 — Other specified pulmonary heart diseases
- rheumatic (chronic) (inactive) (old) (quiescent) (with chorea) I09.9 — Rheumatic heart disease, unspecified
- active or acute I01.9 — Acute rheumatic heart disease, unspecified
- with chorea (acute) (rheumatic) (Sydenham's) I02.0 — Rheumatic chorea with heart involvement
- specified NEC I09.89 — Other specified rheumatic heart diseases
- senile
- syphilitic A52.06 — Other syphilitic heart involvement
- aortic A52.03 — Syphilitic endocarditis
- aneurysm A52.01 — Syphilitic aneurysm of aorta
- congenital A50.54 — Late congenital cardiovascular syphilis
- thyrotoxic E05.90 — Thyrotoxicosis, unspecified without thyrotoxic crisis or storm
- with thyroid storm E05.91 — Thyrotoxicosis, unspecified with thyrotoxic crisis or storm
- valve, valvular (obstructive) (regurgitant)
- congenital NEC Q24.8 — Other specified congenital malformations of heart
- pulmonary Q22.3 — Other congenital malformations of pulmonary valve
- vascular
Common questions about heart organic disease ICD-10 codes
What is the ICD-10 code for heart organic disease?
- I51.9 — Heart disease, unspecified. More specific codes apply when the documentation supports them: I50.1, I01.9, I02.0, I01.8 and others below.
What is the ICD-10 code for amyloid heart organic disease?
- E85.4 — Organ-limited amyloidosis.
What is the ICD-10 code for aortic heart organic disease?
- I35.9 — Nonrheumatic aortic valve disorder, unspecified.
What is the ICD-10 code for beer drinkers' heart organic disease?
- I42.6 — Alcoholic cardiomyopathy.
What is the ICD-10 code for beriberi heart organic disease?
- E51.12 — Wet beriberi.
What is the ICD-10 code for black heart organic disease?
- I27.0 — Primary pulmonary hypertension.
What is the ICD-10 code for congenital heart organic disease?
- Q24.9 — Congenital malformation of heart, unspecified.
Is I51.9 billable?
- Yes. I51.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I51.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I51.9 as a principal diagnosis.
Is I51.9 a CC or MCC?
- No. I51.9 is neither a CC nor an MCC under MS-DRG v44.0.