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  3. A00–B99
  4. Sequelae of infectious and parasitic diseases (B90-B94)

Sequelae of infectious and parasitic diseases (B90-B94)

ICD-10 codes B90-B94 are used specifically to document the late effects or sequelae of infectious and parasitic diseases. These codes capture health problems that persist or develop after the original infection has resolved, such as complications following tuberculosis, poliomyelitis, leprosy, viral hepatitis, and other infections.

This range includes detailed codes like B90 for sequelae of tuberculosis affecting various organs including the central nervous system (B90.0), bones and joints (B90.2), and respiratory system (B90.9). It also covers post-infectious conditions such as late effects of poliomyelitis (B91), leprosy complications (B92), and sequelae from viral encephalitis (B94.1) or trachoma (B94.0). The category B94.8 includes less common sequelae like post-herpetic scars and arthritis following infections. These codes help medical coders accurately link chronic conditions such as post-tuberculous reactive arthritis, neurogenic bladder from poliomyelitis, or immune-related disorders to their infectious origins. Using these codes ensures a clear record of long-term health impacts after infection, which supports proper treatment and epidemiological tracking.

Instructional Notations

Code First

Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.

  • condition resulting from (sequela) the infectious or parasitic disease