Question 1

What is ICD-10 code A39.0?

Accepted Answer

A39.0 is the ICD-10-CM diagnosis code for Meningococcal meningitis. A serious bacterial infection caused by Neisseria meningitidis that inflames the protective membranes surrounding the brain and spinal cord. This is a life-threatening condition requiring immediate medical treatment. A39.0 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. A39.0 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Question 2

Is A39.0 an HCC code?

Accepted Answer

A39.0 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 3

Is A39.0 billable?

Accepted Answer

Yes. A39.0 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. A39.0 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Question 4

Which HCC does A39.0 map to under V28?

Accepted Answer

A39.0 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 5

What RAF reference is published for A39.0?

Accepted Answer

A39.0 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

Question 6

What is the V28 vs V24 difference for A39.0?

Accepted Answer

A39.0 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

Question 7

What documentation supports A39.0?

Accepted Answer

This code requires documentation of meningococcal infection with meningitis; verify the organism is confirmed as Neisseria meningitidis before coding Check for additional codes needed for complications such as sepsis (A39.4), meningococcemia, or other manifestations that may be present A39.0 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

Question 8

Can A39.0 be a primary diagnosis?

Accepted Answer

Yes. A39.0 carries no code-first instruction in the FY2026 tabular, so it can be the first-listed diagnosis when it is the condition chiefly responsible for the encounter and the note supports it, and it can also be reported as a secondary diagnosis. For risk adjustment the order does not matter; the V28 category is the same either way.

Question 9

Which codes cannot be reported with A39.0?

Accepted Answer

The Excludes1 note that applies to A39.0 lists certain localized infections - see body system-related chapters. An Excludes1 condition is not reported together with A39.0; report one or the other, unless the two conditions are unrelated, which the ICD-10-CM Official Guidelines (Section I.A.12.a) allow. The Excludes2 note lists carrier or suspected carrier of infectious disease (Z22.-); 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); those are separate conditions that may be reported together with A39.0 when both are documented.

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A39.0

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A39.0 ICD-10-CM Code: Meningococcal meningitis

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A39.0

Is A39.0 an HCC code?

Get the V28 mapping + MEAT cheat sheet

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Also searched as

Work A39.0 in HCC Buddy