2025 ICD-10-CM Diagnosis Code I43

Cardiomyopathy in diseases classified elsewhere

ICD-10-CM Code:
I43
ICD-10 Code for:
Cardiomyopathy in diseases classified elsewhere
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Chronic
Code Navigator:

I43 is a billable diagnosis code used to specify a medical diagnosis of cardiomyopathy in diseases classified elsewhere. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2024 through September 30, 2025.

Code Classification

  • Diseases of the circulatory system
    I00–I99
    • Other forms of heart disease
      I30-I5A
      • Cardiomyopathy in diseases classified elsewhere
        I43

Approximate Synonyms

The following list of clinical terms are approximate synonyms, alternative descriptions, or common phrases that might be used by patients, healthcare providers, or medical coders to describe the same condition. These synonyms and related diagnosis terms are often used when searching for an ICD-10 code, especially when the exact medical terminology is unclear. Whether you're looking for lay terms, similar diagnosis names, or common language alternatives, this list can help guide you to the correct ICD-10 classification.

  • Acromegalic cardiomyopathy
  • Cardiac familial non-neuropathic amyloidosis
  • Cardiac familial non-neuropathic amyloidosis
  • Cardiac glycogen phosphorylase kinase deficiency
  • Cardiac secondary systemic amyloidosis
  • Cardiomyopathy associated with another disorder
  • Cardiomyopathy due to connective tissue disease
  • Cardiomyopathy due to connective tissue disease
  • Cardiomyopathy due to COVID-19
  • Cardiomyopathy due to storage disease
  • Cardiomyopathy due to viral infection
  • Cardiomyopathy in Duchenne muscular dystrophy
  • Cardiomyopathy in Friedreich's ataxia
  • Cardiomyopathy in myotonic dystrophy
  • Diabetic cardiomyopathy
  • Dilated cardiomyopathy due to systemic lupus erythematosus
  • Disorder of heart due to systemic lupus erythematosus
  • Endomyocardial fibrosis
  • Familial cardiomyopathy
  • Familial cardiomyopathy
  • Familial non-neuropathic amyloidosis
  • Familial non-neuropathic amyloidosis
  • Familial restrictive cardiomyopathy
  • Familial restrictive cardiomyopathy
  • Glycogen phosphorylase kinase deficiency
  • Glycogen phosphorylase kinase deficiency, autosomal recessive
  • Glycogen storage disease with severe cardiomyopathy due to glycogenin deficiency
  • Heart disease due to thyrotoxicosis
  • Infiltrative cardiomyopathy
  • Localized hereditary amyloidosis
  • Localized hereditary cardiac amyloidosis
  • Myocardial degeneration
  • Primary eosinophilic endomyocardial cardiomyopathy
  • Primary eosinophilic endomyocardial restrictive cardiomyopathy
  • Primary restrictive cardiomyopathy
  • Primary triglyceride deposit cardiomyovasculopathy
  • Restrictive cardiomyopathy secondary to familial storage disease
  • Restrictive cardiomyopathy with endomyocardial fibrosis
  • Secondary systemic amyloidosis
  • Thyrotoxic cardiomyopathy
  • Transthyretin related familial amyloid cardiomyopathy

Clinical Classification

Clinical Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.

They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.

Myocarditis and cardiomyopathy

CCSR Code: CIR005

Inpatient Default: X - Not applicable.

Outpatient Default: X - Not applicable.

Clinical Information

  • 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).
  • Endomyocardial Fibrosis

    a disease characterized by fibrotic thickening of the endocardium, particularly the right and/or left inflow tracts. the disease often involves the atrioventricular valves, leading to valvular regurgitaion. it most commonly occurs in children living within 15 degrees of the equator.
  • Myocardial Degeneration

    degeneration of myocardial tissue.

Code Edits

The Medicare Code Editor (MCE) detects errors and inconsistencies in ICD-10-CM diagnosis coding that can affect Medicare claim validity. These Medicare code edits help medical coders and billing professionals determine when a diagnosis code is not appropriate as a principal diagnosis, does not meet coverage criteria. Use this list to verify whether a code is valid for Medicare billing and to avoid claim rejections or denials due to diagnosis coding issues.

Manifestation diagnoses

Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Convert I43 to ICD-9-CM

Below are the ICD-9 codes that most closely match this ICD-10 code, based on the General Equivalence Mappings (GEMs). This ICD-10 to ICD-9 crosswalk tool is helpful for coders who need to reference legacy diagnosis codes for audits, historical claims, or approximate code comparisons.

Cardiomyopath in oth dis

ICD-9-CM: 425.8

Approximate Flag - The approximate mapping means this ICD-10 code does not have an exact ICD-9 equivalent. The matched code is the closest available option, but it may not fully capture the original diagnosis or clinical intent.

Patient Education


Cardiomyopathy

Cardiomyopathy is the name for diseases of the heart muscle. These diseases enlarge your heart muscle or make it thicker and more rigid than normal. In rare cases, scar tissue replaces the muscle tissue.

Some people live long, healthy lives with cardiomyopathy. Some people don't even realize they have it. In others, however, it can make the heart less able to pump blood through the body. This can cause serious complications, including:

  • Heart failure
  • Abnormal heart rhythms
  • Heart valve problems
  • Sudden cardiac arrest (SCA)

Heart attacks, high blood pressure, infections, and other diseases can all cause cardiomyopathy. Some types of cardiomyopathy run in families. In many people, however, the cause is unknown. Treatment might involve medicines, surgery, other medical procedures, and lifestyle changes.

NIH: National Heart, Lung, and Blood Institute


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.