B66.5 — Fasciolopsiasis
Is B66.5 billable?
Yes — B66.5 is billable for FY2027. B66.5 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. B66.5 may be submitted for encounters from October 1, 2026 through September 30, 2027.
B66.5 at a glance
| Code | B66.5 |
|---|---|
| Description | Fasciolopsiasis |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does B66.5 group to?
B66.5 sits in MDC 07 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.
- 441Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with MCCmedical
- 442Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis with CCmedical
- 443Disorders of Liver Except Malignancy, Cirrhosis or Alcoholic Hepatitis without CC/MCCmedical
As a secondary diagnosis, B66.5 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is B66.5 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to B66.5. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Fasciolopsis, fasciolopsiasis (intestinal)
- Distomiasis › intestinal
- Infection, infected, infective › Fasciolopsis (opportunistic)
- Infestation › Fasciolopsis
- Infestation › fluke › intestinal
Inclusion terms
Alternative wording in documentation that is classified to B66.5.
- Infection due to Fasciolopsis buski
- Intestinal distomiasis
Use additional code — inherited from Chapter 1
Report an additional code alongside B66.5 to fully describe the condition. B66.5 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 B66.5, but a patient may have both at the same time. When documentation supports it, B66.5 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 B66.5 existed?
B66.5 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.