Alphabetic Index FY2027

A39

Meningococcal infection

FY2027Chapter 1: Certain infectious and parasitic diseases/A30–A49 Other bacterial diseases

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

A39 is a non-billable ICD-10-CM code category for meningococcal infection. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are A39.0 Meningococcal meningitis, A39.1 Waterhouse-Friderichsen syndrome, A39.2 Acute meningococcemia, A39.3 Chronic meningococcemia and 4 more. Its coding notes include a Use additional code instruction and 5 Excludes2 entries.

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (1 note)
Inherited from Chapter 1 Certain infectious and parasitic diseases
  • code to identify resistance to antimicrobial drugs (Z16.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (5 notes)
Inherited from Chapter 1 Certain infectious and parasitic diseases
  • 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)

Includes

Further defines or gives examples of the content of the category.

Also from chapter/block level (1 note)
Inherited from Chapter 1 Certain infectious and parasitic diseases
  • diseases generally recognized as communicable or transmissible

More specific codes under A39 8