2027 ICD-10-CM Diagnosis Code A39.3Chronic meningococcemia
ICD-10-CM Codes›A00–B99›A30-A49›A39
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 2
- Not Chronic
A39.3 is a billable ICD-10-CM diagnosis code for chronic meningococcemia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 870 through 872. 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 40 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections.
For Medicare Advantage risk adjustment, A39.3 maps to CMS-HCC Category 2 (Septicemia, Sepsis, Systemic Inflammatory Response Syndrome/Shock) under the V28 model, adding a risk factor of about 0.500 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
A39.3 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chronic meningococcemia
- Meningococcemia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A39.3: 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 A39.3, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Infection, infected, infective (opportunistic) B99.9
meningococcal See Also: condition; A39.9
chronic A39.3
chronic A39.3
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Meningococcal Infections
infections with bacteria of the species neisseria meningitidis.
Patient EducationClinical
Meningococcal Disease
Meningococcal disease is the name for any illness that is caused by Neisseria meningitidis bacteria (also called meningococcal bacteria). These illnesses are often severe and can sometimes be deadly. They include infections of the lining of the brain and spinal cord (meningitis) and in the bloodstream (sepsis).
The full article covers:
- What is meningococcal disease?
- What causes meningococcal disease?
- Who is more likely to get meningococcal disease?
- What are the symptoms of meningococcal disease?
- How is meningococcal disease diagnosed?
- What are the treatments for meningococcal disease?
- Can meningococcal disease be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A39.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A39.3Overview
What is the ICD-10 code for chronic meningococcemia?
The ICD-10-CM code for chronic meningococcemia is A39.3 (sometimes written as A393). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A39.3 (Meningococcal infection) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report chronic meningococcemia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A39.3 group to?
When chronic meningococcemia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 872, 871, 870, with relative weights from 1.0066 to 6.9432 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A39.3 a CC or MCC?
CMS lists A39.3 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 40 closely related codes in its exclusion list.
What is the ICD-9 equivalent of A39.3?
Under the General Equivalence Mappings, chronic meningococcemia converts to ICD-9-CM 036.2 (meningococcemia). The mapping is approximate, so confirm the match fits the documentation.
What HCC is A39.3?
A39.3 (chronic meningococcemia) maps to CMS-HCC Category 2 (Septicemia, Sepsis, Systemic Inflammatory Response Syndrome/Shock), commonly written as HCC 2, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 2 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.
Does A39.3 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, A39.3 adds a risk adjustment factor of about 0.500 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.447 to 0.780 depending on the payment segment). HCC 2 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 2 category page.
