2027 ICD-10-CM Diagnosis Code B77Ascariasis

ICD-10-CM Codes›A00–B99›B65-B83›B77

ICD-10-CM B77
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Ascariasis
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B77: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

On B77 itself
  • ascaridiasis
  • roundworm infection
From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • 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)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name B77, its category, or a range that includes it.

Applicable To 1

These notes mention B77.

  • B81.4 Mixed intestinal helminthiases
    Infection due to intestinal helminths classified to more than one of the categories B65.0-B81.3 and B81.8 names B65.0-B81.3, which includes this code

Code First 1

These codes say to code first a condition named in the note, and B77 is one of the conditions named.

  • K67 Disorders of peritoneum in infectious diseases classified elsewhere
    helminthiasis (B65.0 -B83.9) names B65.0 -B83.9, which includes this code

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.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About B77Overview

What is the ICD-10 code for ascariasis?

B77 is the ICD-10-CM category for ascariasis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.