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    OpenPayerBilling CodesHelminthiasesICD-10-CM b77-ascariasis
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    ICD-10-CM Code For Ascariasis: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group B77 includes codes for infections by the roundworm Ascaris lumbricoides, covering intestinal ascariasis and related complications such as intestinal obstruction and migrating larval manifestations. These ICD-10-CM diagnosis codes are used to document clinical scenarios that capture parasitic infection status, complication presence, and organ system involvement such as gastrointestinal or pulmonary effects. Accurate coding within the ICD-10-CM B77 group supports proper claim adjudication and complete clinical documentation for appropriate reimbursement.

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    ICD-10-CM B77: Ascariasis Overview

    The ICD-10-CM B77 group represents infections caused by the roundworm Ascaris lumbricoides affecting the gastrointestinal and occasionally pulmonary systems. These diagnoses target parasitic helminth infections that can cause intestinal obstruction, malnutrition, or migrating larvae-related respiratory symptoms. Accurate coding matters for correct clinical documentation and reimbursement because it captures disease severity and complications that influence claim adjudication.

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    When to Use

    Use a code from this group when a clinician documents infection with Ascaris lumbricoides or related complications such as intestinal obstruction or migrating larvae causing respiratory symptoms. Apply the most specific code available that reflects organ involvement, severity, and any documented complications.

    ICD-10-CM Codes

    4 rows

    ICD-10-CM CodeDescription
    B77.0Ascariasis with intestinal complications
    B77.81Ascariasis pneumonia
    B77.89Ascariasis with other complications
    B77.9Ascariasis, unspecified

    DRG Codes

    2 rows

    DRG CodeDescription
    391Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC
    392Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC

    Typical Clinical Scenarios

    • A young child presents to the emergency department with acute onset of diffuse abdominal pain, vomiting, and visible worms in the stool after several days of anorexia and cough. Stool ova and parasite testing confirms Ascaris lumbricoides infection causing intestinal obstruction symptoms without mention of other helminth species; an acute parasitic infestation diagnosis from the group is assigned. Typical codes: B77.0
    • An adult immigrant with chronic intermittent abdominal discomfort, malnutrition-related weight loss, and persistent eosinophilia is evaluated in primary care; stool studies and history indicate ongoing Ascaris lumbricoides infection without acute complications. Because this represents a non-acute, ongoing helminthic infection managed in the outpatient setting, a nonspecific code for ascariasis is used. Typical codes: B77.9
    • A hospitalized patient develops biliary colic and cholangitis after migration of Ascaris worms into the biliary tree; imaging documents worm impaction and the admission focuses on the complication of ascariasis requiring procedural or surgical management. In this scenario a code indicating ascariasis with other specified complications or manifestations is assigned. Typical codes: B77.81, B77.89

    Related Codes

    B65-SCHISTOSOMIASIS-BILHARZIASIS

    ICD-10-CM Code For Schistosomiasis Bilharziasis: Group Overview

    B66-OTHER-FLUKE-INFECTIONS

    ICD-10-CM Code For Other Fluke Infections: Group Overview

    B67-ECHINOCOCCOSIS

    ICD-10-CM Code For Echinococcosis: Group Overview

    B68-TAENIASIS

    ICD-10-CM Code For Taeniasis: Group Overview

    B69-CYSTICERCOSIS

    ICD-10-CM Code For Cysticercosis: Group Overview

    B70-DIPHYLLOBOTHRIASIS-AND-SPARGANOSIS

    ICD-10-CM Code For Diphyllobothriasis And Sparganosis: Group Overview

    B71-OTHER-CESTODE-INFECTIONS

    ICD-10-CM Code For Other Cestode Infections: Group Overview

    B72-DRACUNCULIASIS

    ICD-10-CM Code For Dracunculiasis: Group Overview

    B73-ONCHOCERCIASIS

    ICD-10-CM Code For Onchocerciasis: Group Overview

    B74-FILARIASIS-AND-FILARIAL-INFECTIONS

    ICD-10-CM Code For Filariasis: Group Overview

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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