2027 ICD-10-CM Diagnosis Code I51.7Cardiomegaly
ICD-10-CM Codes›I00–I99›I30-I5A›I51
- Billable — Valid for Submission
- Chronic Condition
I51.7 is a billable ICD-10-CM diagnosis code for cardiomegaly. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 302 through 303. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other and ill-defined heart disease.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acquired abnormality of right cardiac ventricle
- Acquired dilatation of left cardiac ventricle
- Acquired dilatation of right cardiac ventricle
- Acquired hypertrophy of left cardiac ventricle
- Acquired hypertrophy of right cardiac ventricle
- Apex beat displaced
- Apex beat displaced - LVH
- Apex beat displaced - RVH
- Athlete's heart
- Atrial dilatation
- Atrial hypertrophy
- Atrial hypertrophy by EKG
- Auricular dilatation
- Bilateral enlargement of atria
- Cardiac dilatation
- Cardiac ventricular dilatation
- Cardiomegaly
- Congenital dilatation of atrium
- Cor bovinum
- EKG: right ventricle hypertrophy
- Familial idiopathic dilatation of right atrium
- Giant left atrium
- Hypertrophic cardiomegaly
- Hypertrophy of interatrial septum
- Hypertrophy of left and right cardiac ventricles
- Left atrial dilatation
- Left atrial enlargement
- Left atrial hypertrophy
- Left atrial hypertrophy by EKG
- Left cardiac ventricular dilatation
- Left ventricular hypertrophy
- Left ventricular hypertrophy by electrocardiogram
- Markedly enlarged cardiac chamber
- Mild left ventricular hypertrophy
- Mildly enlarged cardiac chamber
- Moderate left ventricular hypertrophy
- Moderately enlarged cardiac chamber
- Obstruction of pulmonary great vein due to compression by right atrial dilatation
- Position of apex beat - finding
- Right atrial dilatation
- Right atrial enlargement
- Right atrial hypertrophy
- Right atrial hypertrophy by electrocardiogram
- Right cardiac ventricular dilatation
- Right ventricular hypertrophy
- Severe left ventricular hypertrophy
- Transient ischemic dilatation of left cardiac ventricular cavity
- Ventricular hypertrophy
- Ventricular hypertrophy by EKG
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I51.7: its own notes plus those printed at I51 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Cardiac dilatation
- Cardiac hypertrophy
- Ventricular dilatation
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- 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.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Cardiomegaly See Also: Hypertrophy, cardiac;
idiopathic I51.7
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Cardiomegaly
enlargement of the heart, usually indicated by a cardiothoracic ratio above 0.50. heart enlargement may involve the right, the left, or both heart ventricles or heart atria. cardiomegaly is a nonspecific symptom seen in patients with chronic systolic heart failure (heart failure) or several forms of cardiomyopathies.
Patient EducationClinical
Heart Diseases
Heart disease is a general term that includes many types of heart problems. It's a type of cardiovascular disease, which means heart and blood vessel disease.
The full article covers:
- What is heart disease?
- What are the types of heart disease?
- What causes heart diseases?
- Who is more likely to develop heart diseases?
- What are the symptoms of heart disease?
- How are heart diseases diagnosed?
- What are the treatments for heart disease?
- Can heart diseases be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I51.7 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I51.7Overview
What is the ICD-10 code for cardiomegaly?
The ICD-10-CM code for cardiomegaly is I51.7 (sometimes written as I517). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I51.7 (Complications and ill-defined descriptions of heart disease) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report cardiomegaly on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I51.7 group to?
When cardiomegaly is the principal diagnosis on an inpatient stay, it groups to MS-DRG 302, 303, with relative weights from 0.6610 to 1.1993 depending on complications. Higher weights mean higher Medicare reimbursement.
Can I51.7 be reported with a code from I11?
Not as a rule. The Excludes1 note on I51.7 lists "cardiomegaly due to hypertension (I11.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of I51.7?
Under the General Equivalence Mappings, cardiomegaly converts to ICD-9-CM 429.3 (cardiomegaly). The mapping is a direct match.
