2027 ICD-10-CM Diagnosis Code A39.51Meningococcal endocarditis
ICD-10-CM Codes›A00–B99›A30-A49›A39
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Not Chronic
A39.51 is a billable ICD-10-CM diagnosis code for meningococcal endocarditis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 288 through 290, 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 10 closely related codes. Coders also document this condition as meningococcal carditis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections and Endocarditis and endocardial disease.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Meningococcal carditis
- Meningococcal endocarditis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A39.51: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name A39.51, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disease, diseased See Also: Syndrome;
Infection, infected, infective (opportunistic) B99.9
meningococcal See Also: condition; A39.9
endocardium A39.51
endocardium A39.51
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Meningococcal Endocarditis
endocarditis caused by bacterial infection with meningococcus species.Meningococcal Infections
infections with bacteria of the species neisseria meningitidis.
Patient EducationClinical
Endocarditis
Endocarditis is sometimes called infective endocarditis. It's a rare but life-threatening inflammation of the lining inside your heart's chambers and valves (the endocardium).
The full article covers:
- What is endocarditis?
- What causes endocarditis?
- Who is more likely to develop endocarditis?
- What are the symptoms of endocarditis?
- What other problems can endocarditis cause?
- How is endocarditis diagnosed?
- What are the treatments for endocarditis?
- Can endocarditis be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A39.51 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A39.51Overview
What is the ICD-10 code for meningococcal endocarditis?
The ICD-10-CM code for meningococcal endocarditis is A39.51 (sometimes written as A3951). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A39.51 (Meningococcal heart disease) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report meningococcal endocarditis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A39.51 group to?
When meningococcal endocarditis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 289, 791, 288, 290, with relative weights from 0.7843 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A39.51 a CC or MCC?
CMS lists A39.51 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 10 closely related codes in its exclusion list.
What is the ICD-9 equivalent of A39.51?
Under the General Equivalence Mappings, meningococcal endocarditis converts to ICD-9-CM 036.42 (meningococc endocarditis). The mapping is a direct match.
