B64 — Unspecified protozoal disease
Is B64 billable?
Yes, but B64 is an unspecified code. B64 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, B64 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting B64.
B64 at a glance
| Code | B64 |
|---|---|
| Description | Unspecified protozoal disease |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does B64 group to?
B64 sits in MDC 18 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 867Other Infectious and Parasitic Diseases Diagnoses with MCCmedical
- 868Other Infectious and Parasitic Diseases Diagnoses with CCmedical
- 869Other Infectious and Parasitic Diseases Diagnoses without CC/MCCmedical
How is B64 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to B64. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Disease, diseased › protozoal
- Infection, infected, infective › protozoal NEC (opportunistic)
- Infestation › protozoal NEC
- Protozoal › disease
Excludes1 — never code together — inherited from B50-B64
The conditions below can never be reported together with B64 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 1
Report an additional code alongside B64 to fully describe the condition. B64 is sequenced first.
- code to identify resistance to antimicrobial drugs (Z16.-)
Excludes2 — not included here — inherited from Chapter 1
The conditions below are not part of B64, but a patient may have both at the same time. When documentation supports it, B64 and the excluded code may both be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
How long has B64 existed?
B64 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.