Endocarditis and heart valve disorders in diseases classified elsewhere (I39) ICD-10-CM
The I39 code range covers endocarditis and heart valve disorders 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:
- Q fever A78
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 I39 Range 1 codes · 1 billable
- I39 Endocarditis and heart valve disorders in diseases classified elsewhere
About the I39 Code Range
The ICD-10 code I39 is used to classify endocarditis and heart valve disorders that occur as part of other diseases. This category covers heart valve abnormalities and infections linked to specific underlying conditions rather than primary heart diseases.
This code encompasses a range of conditions, including endocarditis associated with infections like Histoplasma capsulatum or Histoplasma duboisii (also called African histoplasmosis), as well as various congenital and acquired abnormalities of the atrioventricular valves. These include valve stenosis, regurgitation, prolapse, dysplasia, and structural anomalies such as double orifice valves or abnormal chordae tendineae. Terms like "mycotic endocarditis" and "endocarditis associated with another disorder" relate here, helping clarify that these valve problems are secondary to or part of broader systemic diseases. Medical coders should use I39 when coding for endocarditis or valve irregularities attributed to diseases classified elsewhere, ensuring accurate documentation for complex cases involving multiple body systems.
Questions About This Page
How many billable codes are in the I39 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 I39 range classify?
The range classifies endocarditis and heart valve disorders 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.
