ICD-10-CM 2027
ICD-10 code for capillariasis
From the official ICD-10-CM alphabetic index entry “Capillariasis (intestinal)”. Page updated September 29, 2026.
About coding capillariasis
The ICD-10-CM code for capillariasis is B81.1 (Intestinal capillariasis). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on B81.1.
Within B81 (other intestinal helminthiases, not elsewhere classified), B81.1 is specifically for intestinal capillariasis. Related codes cover Anisakiasis (B81.0), Trichostrongyliasis (B81.2), intestinal angiostrongyliasis (B81.3), mixed intestinal helminthiases (B81.4) and other specified intestinal helminthiases (B81.8).
The conditions in its Excludes2 note aren't part of B81.1, but may be coded alongside it if the patient has both: hepatic capillariasis (B83.8).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
More specific capillariasis codes (official index)
- hepatic B83.8 — Other specified helminthiases
Common questions about capillariasis ICD-10 codes
What is the ICD-10 code for capillariasis?
- B81.1 — Intestinal capillariasis. More specific codes apply when the documentation supports them: B83.8.
What is the ICD-10 code for hepatic capillariasis?
- B83.8 — Other specified helminthiases.
Is B81.1 billable?
- Yes. B81.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B81.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B81.1 as a principal diagnosis.
Is B81.1 a CC or MCC?
- B81.1 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.