B99.9

Unspecified infectious disease

Billable / specific

B99.9 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.

Inclusion terms

Includes (from B99)

  • diseases generally recognized as communicable or transmissible

Excludes2

Not included here — may be reported together when both conditions exist.

  • carrier or suspected carrier of infectious disease (Z22.-) (from B99)
  • certain localized infections - see body system-related chapters (from B99)
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-) (from B99)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39) (from B99)
  • influenza and other acute respiratory infections (J00-J22) (from B99)

Use additional code

Add a code to identify the following, if applicable.

  • code to identify resistance to antimicrobial drugs (Z16.-) (from B99)

Also known as

  • Disease, diseased, epidemic
  • Disease, diseased, infectious, infective
  • Fever, infective
  • Granuloma, infectious
  • Infection, infected, infective

Parent code

  • B99Other and unspecified infectious diseasesHeader

Related codes

  • B99.8Other infectious diseaseBillable

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