ICD-10-CM 2027
ICD-10 code for meningococcal endocarditis
From the official ICD-10-CM alphabetic index entry “Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular) › meningococcal”. Page updated September 29, 2026.
About coding meningococcal endocarditis
The ICD-10-CM code for meningococcal endocarditis is A39.51 (Meningococcal endocarditis).
Within A39.5 (meningococcal heart disease), A39.51 is specifically for meningococcal endocarditis. Related codes cover carditis, unspecified (A39.50), myocarditis (A39.52) and pericarditis (A39.53).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 288 (Acute and Subacute Endocarditis with MCC, relative weight 2.6315), DRG 289 (Acute and Subacute Endocarditis with CC, relative weight 1.5362), DRG 290 (Acute and Subacute Endocarditis without CC/MCC, relative weight 0.8367), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 05 (Diseases and Disorders of the Circulatory System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about meningococcal endocarditis ICD-10 codes
What is the ICD-10 code for meningococcal endocarditis?
- A39.51 — Meningococcal endocarditis.
Is A39.51 billable?
- Yes. A39.51 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A39.51 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A39.51 as a principal diagnosis.
Is A39.51 a CC or MCC?
- A39.51 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.