B89 — Unspecified parasitic disease
Is B89 billable?
Yes, but B89 is an unspecified code. B89 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, B89 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 B89.
B89 at a glance
| Code | B89 |
|---|---|
| Description | Unspecified parasitic disease |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does B89 group to?
B89 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 B89 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to B89. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Parasitism
- Cyst › parasitic (colloid) (mucous) (simple) (retention)
- Disease, diseased › parasitic
- Infection, infected, infective › parasitic (opportunistic)
- Infestation › orbit, parasitic NOS
- Infestation › parasite, parasitic
- Meningoencephalitis › parasitic NEC
- Parasitic › disease NEC
- Arthritis, arthritic › due to or associated with › parasitic disease NEC (acute) (chronic) (nonpyogenic) (subacute)
- Arthritis, arthritic › in › parasitic disease NEC (acute) (chronic) (nonpyogenic) (subacute)
- Encephalitis › in › parasitic disease NEC (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)
- Hydrocephalus › in › infectious disease NEC (acquired) (external) (internal) (malignant) (recurrent)
Use additional code — inherited from Chapter 1
Report an additional code alongside B89 to fully describe the condition. B89 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 B89, but a patient may have both at the same time. When documentation supports it, B89 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 B89 existed?
B89 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.