ICD-10-CM 2027
ICD-10 code for parasitic disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › parasitic”. Page updated September 29, 2026.
About coding parasitic disease
The ICD-10-CM code for parasitic disease is B89 (Unspecified parasitic disease). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on B89.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific parasitic disease codes (official index)
Common questions about parasitic disease ICD-10 codes
What is the ICD-10 code for parasitic disease?
- B89 — Unspecified parasitic disease. More specific codes apply when the documentation supports them: B71.9, B82.9, B37.0, B88.9 and others below.
What is the ICD-10 code for cerebral nec parasitic disease?
- B71.9 — Cestode infection, unspecified.
What is the ICD-10 code for intestinal nos parasitic disease?
- B82.9 — Intestinal parasitism, unspecified.
What is the ICD-10 code for mouth parasitic disease?
- B37.0 — Candidal stomatitis.
What is the ICD-10 code for skin nos parasitic disease?
- B88.9 — Infestation, unspecified.
What is the ICD-10 code for tongue parasitic disease?
- B37.0 — Candidal stomatitis.
Is B89 billable?
- Yes. B89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B89 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B89 as a principal diagnosis.
Is B89 a CC or MCC?
- No. B89 is neither a CC nor an MCC under MS-DRG v44.0.