ICD-10-CM 2027
ICD-10 code for Ascariasis
From the official ICD-10-CM alphabetic index entry “Ascariasis”. Page updated September 29, 2026.
About coding Ascariasis
The ICD-10-CM code for Ascariasis is B77.9 (Ascariasis, unspecified). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on B77.9.
Within B77, choose B77.9 (unspecified) only when documentation doesn't support a more specific option: with intestinal complications (B77.0) and with other complications (B77.8).
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.
In MS-DRG v44.0, it is part of the grouping logic for DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Ascariasis codes (official index)
Common questions about Ascariasis ICD-10 codes
What is the ICD-10 code for Ascariasis?
- B77.9 — Ascariasis, unspecified. More specific codes apply when the documentation supports them: B77.89, B77.0, B77.81.
Is B77.9 billable?
- Yes. B77.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B77.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B77.9 as a principal diagnosis.
Is B77.9 a CC or MCC?
- B77.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.