Ascariasis (B77) ICD-10-CM
The B77 code range covers ascariasis with 6 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- ascaridiasis
- roundworm infection
Codes in the B77 Range 6 codes · 4 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B77 range.
Ascariasis
Infection by nematodes of the genus ASCARIS. Ingestion of infective eggs causes diarrhea and pneumonitis. Its distribution is more prevalent in areas of poor sanitation and where human feces are used for fertilizer.
Ascaris
A genus of nematodes of the superfamily ASCARIDOIDEA whose species usually inhabit the intestine.
About the B77 Code Range
ICD-10 codes for Ascariasis cover infections caused by the Ascaris lumbricoides parasite affecting various parts of the body. These codes classify both the general infection and specific complications such as intestinal or pulmonary involvement.
Codes in the B77 category identify different manifestations of ascariasis. For example, B77.0 is used for ascariasis with intestinal complications, a condition also known as larval ascariasis or parasitic infection of the colon by Ascaris lumbricoides. When ascariasis leads to lung involvement, B77.81 applies, capturing pneumonia caused by the parasite, sometimes referred to as pulmonary nematodiasis. Other complications like biliary or ocular infections fall under B77.89. For cases where the specific location or complication is not documented, B77.9 provides an unspecified ascariasis code, including infections from related species such as Ascaridia or Ascaris suum. This classification helps ensure precise coding for parasitic infections caused by Ascaris, supporting accurate diagnosis and treatment documentation.
Questions About This Page
How many billable codes are in the B77 range?
Of the 6 codes in this range, 4 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the B77 range classify?
The range classifies ascariasis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
