ICD-10-CM 2027
ICD-10 code for disease protozoal
From the official ICD-10-CM alphabetic index entry “Protozoal › disease”. Page updated September 29, 2026.
About coding disease protozoal
The ICD-10-CM code for disease protozoal is B64 (Unspecified protozoal 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 B64.
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 disease protozoal codes (official index)
- specified NEC B60.8 — Other specified protozoal diseases
Common questions about disease protozoal ICD-10 codes
What is the ICD-10 code for disease protozoal?
- B64 — Unspecified protozoal disease. More specific codes apply when the documentation supports them: B60.8.
Is B64 billable?
- Yes. B64 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B64 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B64 as a principal diagnosis.
Is B64 a CC or MCC?
- No. B64 is neither a CC nor an MCC under MS-DRG v44.0.