ICD-10 I39
Billable / Specific CCEndocarditis and heart valve disorders in diseases classified elsewhere
About ICD-10-CM I39
ICD-10-CM code I39 represents Endocarditis and heart valve disorders in diseases classified elsewhere. This is a billable/specific code in the Circulatory System chapter (block I39). The 2026 edition of ICD-10-CM I39 became effective on October 1, 2025.
Coding Tips for I39
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
I39 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Type 1 Excludes
Pure excludes, these codes can never be coded together with I39. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- endocardial involvement in:
- candidiasis (B37.6)
- gonococcal infection (A54.83)
- Libman-Sacks disease (M32.11)
- listerosis (A32.82)
- meningococcal infection (A39.51)
- rheumatoid arthritis (M05.31)
- syphilis (A52.03)
- tuberculosis (A18.84)
- typhoid fever (A01.02)
Coding Notes
Code First
- underlying disease, such as:
- Q fever (A78)
Inpatient DRG Impact, CC
codes Endocarditis and heart valve disorders in diseases classified elsewhere. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for I39
Local Coverage Determinations (LCDs) from CMS MACs that list I39 as a covered diagnosis.
Showing top 10 of 345 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing I39.
1 Aetna
1 Cigna
5 Medicare
CPT Codes Commonly Billed with I39
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert I39 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| I39 | 4211 | 10000 |
| I39 | 42491 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To I39
Other codes in section I30-I5A (Other forms of heart disease).
ICD-10 I39, Billing FAQ
Is ICD-10 code I39 billable? +
Yes, I39 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for I39? +
Type 1 Excludes (never code together with I39): endocardial involvement in:; candidiasis (B37.6); gonococcal infection (A54.83)
Is I39 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What ICD-9 codes does I39 map to? +
Per CMS GEMs, I39 maps to ICD-9 codes: 4211, 42491. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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