2026 ICD-10-CM Diagnosis Code B77Ascariasis

ICD-10-CM Codes›A00–B99›B65-B83›B77

ICD-10-CM B77
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B77 is a non-billable ICD-10-CM category code for ascariasis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B77.0, B77.81, B77.89, and B77.9.

Code Identity

ICD-10-CM Code
B77
Billable Status
No — Non-Billable Category
Code Describes
Ascariasis
Chapter
B65-B83
Helminthiases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB65-B83Helminthiases
CategoryB77Ascariasis
This CodeB77Ascariasis

Specific Coding for AscariasisOverview

Non-specific codes like B77 require more characters. Use one of these billable codes instead:

  • Use B77.0 for Ascariasis with intestinal complications

  • B77.8 for Ascariasis with other complications

  • Use B77.81 for Ascariasis pneumonia

  • Use B77.89 for Ascariasis with other complications

  • Use B77.9 for Ascariasis, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • ascaridiasis
  • roundworm infection

Clinical InformationClinical

  • 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.

  • Ascariasis

    an infection that is caused by the roundworm ascaris lumbricoides, many cases of which remain asymptomatic. during the transient larval migratory phase, shortness of breath, fever, and eosinophilia can occur. depending on the intestinal worm burden, a spectrum of gastrointestinal tract symptoms can occur.

  • Baylisascariasis|Raccoon Roundworm Infection

    an infection that is caused by the raccoon nematode baylisascaris procyonis, which is transmitted by the ingestion of embryonated eggs in contaminated soil; symptoms depend on larval migration sites (visceral organs, eye, or brain) provoking severe inflammatory responses.

Patient EducationClinical

Parasitic Diseases

Parasites are living things that use other living things - like your body - for food and a place to live. You can get them from contaminated food or water, a bug bite, or sexual contact. Some parasitic diseases are easily treated and some are not.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B77Overview

Is B77 (Ascariasis) a billable code?

No. This is a category header that groups the codes for ascariasis, and headers cannot be submitted on claims. Claims for ascariasis need a more specific code from this category, such as B77.0, B77.81, and B77.89.