ICD-10-CM 2027
ICD-10 code for infectious disease sequelae
From the official ICD-10-CM alphabetic index entry “Sequelae (of) › infectious disease”. Page updated September 29, 2026.
About coding infectious disease sequelae
The ICD-10-CM code for infectious disease sequelae is B94.9 (Sequelae of unspecified infectious and parasitic disease). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on B94.9.
Within B94, choose B94.9 (unspecified infectious and parasitic disease) only when documentation doesn't support a more specific option: trachoma (B94.0), viral encephalitis (B94.1), viral hepatitis (B94.2) and other specified infectious and parasitic diseases (B94.8).
The conditions in its Excludes2 note aren't part of B94.9, but may be coded alongside it if the patient has both: post COVID-19 condition (U09.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific infectious disease sequelae codes (official index)
- specified NEC B94.8 — Sequelae of other specified infectious and parasitic diseases
Common questions about infectious disease sequelae ICD-10 codes
What is the ICD-10 code for infectious disease sequelae?
- B94.9 — Sequelae of unspecified infectious and parasitic disease. More specific codes apply when the documentation supports them: B94.8.
Is B94.9 billable?
- Yes. B94.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B94.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B94.9 as a principal diagnosis.
Is B94.9 a CC or MCC?
- No. B94.9 is neither a CC nor an MCC under MS-DRG v44.0.