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    v1.0.28
    OpenPayerBilling CodesHelminthiasesICD-10-CM b74-filariasis-and-filarial-infections
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    ICD-10-CM Code For Filariasis: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group B74 includes infections caused by filarial nematodes such as Wuchereria bancrofti, Brugia species, and Onchocerca that affect lymphatic and subcutaneous tissues, resulting in conditions like lymphatic filariasis and onchocerciasis. These ICD-10-CM diagnosis codes are used to document clinical scenarios including chronic lymphedema, elephantiasis, ocular or skin involvement, and systemic complications that capture disease severity and anatomic involvement. Accurate coding within the ICD-10-CM B74 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM B74: Filariasis Overview

    The ICD-10-CM B74 group contains diagnoses for filarial parasitic infections that primarily affect the lymphatic system and subcutaneous tissues. These conditions are caused by nematode worms transmitted by insect vectors and can lead to lymphedema, elephantiasis, or subcutaneous nodules depending on the species. Accurate coding matters for proper clinical documentation and supports appropriate reimbursement by reflecting disease severity and complications.

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    When to Use

    Use codes from this group when a clinician documents a confirmed filarial infection or a sequela directly attributed to filariasis, including chronic lymphedema or ocular involvement. Select the code that reflects the causative organism and the anatomic site or complication to capture severity and guide administrative processing.

    ICD-10-CM Codes

    7 rows

    ICD-10-CM CodeDescription
    B74.0Filariasis due to Wuchereria bancrofti
    B74.1Filariasis due to Brugia malayi
    B74.2Filariasis due to Brugia timori
    B74.3Loiasis
    B74.4Mansonelliasis
    B74.8Other filariases
    B74.9Filariasis, unspecified

    DRG Codes

    3 rows

    DRG CodeDescription
    867Other Infectious and Parasitic Diseases Diagnoses with MCC
    868Other Infectious and Parasitic Diseases Diagnoses with CC
    869Other Infectious and Parasitic Diseases Diagnoses without CC/MCC

    Typical Clinical Scenarios

    • An adult patient from a tropical endemic region presents to urgent care with acute onset of high fever, severe migratory lymphangitis and painful, swollen inguinal lymph nodes. Blood filarial microfilariae are identified on peripheral smear and the clinician documents an acute filarial infection as the cause of the systemic symptoms; a filariasis-specific code from this group is assigned for the acute helminthic infection. Typical codes: B74.0, B74.1
    • A middle-aged patient has progressive unilateral leg swelling over months with peau d’orange skin changes and recurrent bacterial cellulitis; history reveals prior untreated filarial exposure. The chronic elephantiasis-like lymphedema is managed as a long-term sequela of filarial infection, and a chronic filariasis code is used to capture the underlying parasitic etiology contributing to the lymphedema and recurrent infections. Typical codes: B74.4, B74.9
    • A hospitalized patient presents with chronic filarial disease complicated by secondary bacterial superinfection and sepsis after skin breakdown of a lymphedematous limb. The admission documents both the underlying filarial etiology and the infectious complication; coding includes the filariasis code to indicate the parasitic cause contributing to the complication alongside codes for the superimposed infection. Typical codes: B74.3, B74.8

    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

    B75-TRICHINELLOSIS

    ICD-10-CM Code For Trichinellosis: 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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