Cardiomyopathy in diseases classified elsewhere (I43) ICD-10-CM
The I43 code range covers cardiomyopathy in diseases classified elsewhere with 1 ICD-10-CM diagnosis codes. 1 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
- underlying disease, such as:
- amyloidosis E85
- glycogen storage disease E74.0
- gout M10.0
- thyrotoxicosis E05.0 E05.9
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the I43 Range 1 codes · 1 billable
- I43 Cardiomyopathy in diseases classified elsewhere
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I43 range.
Endomyocardial Fibrosis
A condition characterized by the thickening of the ventricular ENDOCARDIUM and subendocardium (MYOCARDIUM), seen mostly in children and young adults in the TROPICAL CLIMATE. The fibrous tissue extends from the apex toward and often involves the HEART VALVES causing restrictive blood flow into the respective ventricles (CARDIOMYOPATHY, RESTRICTIVE).
About the I43 Code Range
The ICD-10 code I43 is used to identify cardiomyopathy that arises specifically as a result of other underlying diseases rather than as a primary heart condition. This includes heart muscle disorders linked to systemic illnesses like thyrotoxicosis, systemic lupus erythematosus, or viral infections.
Cardiomyopathy in diseases classified elsewhere (I43) covers a diverse group of heart muscle diseases caused by various systemic or inherited conditions. Commonly called names such as thyrotoxic cardiomyopathy, diabetic cardiomyopathy, or familial restrictive cardiomyopathy, these reflect heart problems secondary to diseases including endocrine disorders, autoimmune diseases, metabolic storage diseases, infections like COVID-19, and genetic abnormalities such as muscular dystrophies or amyloidosis. Using this ICD-10 code allows healthcare professionals and coders to classify cardiomyopathy precisely when it is linked to another disorder, clarifying the connection between the heart condition and its systemic cause. This specificity improves accuracy when documenting complex cases where the heart disease is one aspect of a broader illness, thus ensuring that the right ICD-10 code for cardiomyopathy due to systemic or hereditary disease is applied.
Questions About This Page
How many billable codes are in the I43 range?
Of the 1 codes in this range, 1 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the I43 range classify?
The range classifies cardiomyopathy in diseases classified elsewhere. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
