Acute myocarditis
In Other forms of heart disease (I30-I5A), chapter 9: Diseases of the Circulatory System
4 billable codes under I40: all are an MCC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.
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Instructional notes
Includes: conditions that are coded here
- subacute myocarditis
Excludes1: not coded here, use a different code
- acute rheumatic myocarditis (I01.2)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers hypertension with heart and kidney disease, coronary artery disease with angina, perioperative stroke, cerebrovascular sequelae, and acute myocardial infarction types and timing.
- Hypertension (page 50)
- Atherosclerotic Coronary Artery Disease and Angina (page 52)
- Intraoperative and Postprocedural Cerebrovascular Accident (page 53)
- Sequelae of Cerebrovascular Disease (page 53)
- Acute myocardial infarction (AMI) (page 54)
All codes under I40
I40 can't be used on a claim. Pick a billable code below; grey headings group them.
I40 MS-DRGs
As the principal diagnosis, the billable codes under I40 group to these 8 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 314 Other Circulatory System Diagnoses with MCC (4 of 4 codes)
- DRG 315 Other Circulatory System Diagnoses with CC (4 of 4 codes)
- DRG 316 Other Circulatory System Diagnoses without CC/MCC (4 of 4 codes)
- DRG 974 HIV with Major Related Condition with MCC (4 of 4 codes)
- DRG 975 HIV with Major Related Condition with CC (4 of 4 codes)
- DRG 976 HIV with Major Related Condition without CC/MCC (4 of 4 codes)
- DRG 791 Prematurity with Major Problems (1 of 4 codes)
- DRG 793 Full Term Neonate with Major Problems (1 of 4 codes)
Other codes that refer to I40
Notes on these codes point to I40.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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.
Read more about cardiomyopathy on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.