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    v1.0.28
    OpenPayerBilling CodesOther bacterial diseasesICD-10-CM a44-bartonellosis
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    ICD-10-CM Code For Bartonellosis: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group A44 includes infections caused by Bartonella species such as bartonellosis, bacillary angiomatosis, and Bartonella endocarditis, covering cutaneous, lymphatic, systemic, and cardiac manifestations. These ICD-10-CM diagnosis codes are used to document clinical scenarios including localized skin or lymph node infection, disseminated disease with organ involvement, or infective endocarditis due to Bartonella species, capturing disease severity, organ involvement, or clinical complexity relevant to this group. Accurate coding within the ICD-10-CM A44 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM A44: Bartonellosis Overview

    The ICD-10-CM A44 group encompasses infections caused by Bartonella species, affecting the vascular and reticuloendothelial systems and sometimes leading to endocarditis or bacillary angiomatosis. These diagnoses target systemic bacterial infections that can involve skin, lymph nodes, liver, spleen, and heart. Accurate coding is important for proper documentation of disease severity and treatment complexity and impacts reimbursement and public health reporting.

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    When to Use

    Use a code from this group when a clinical diagnosis identifies Bartonella infection based on laboratory confirmation, characteristic clinical findings, or a treating clinician's documented impression. Assign the code that best reflects the anatomic site and any complications, such as endocarditis or disseminated disease, to accurately represent clinical complexity.

    ICD-10-CM Codes

    4 rows

    ICD-10-CM CodeDescription
    A44.0Systemic bartonellosis
    A44.1Cutaneous and mucocutaneous bartonellosis
    A44.8Other forms of bartonellosis
    A44.9Bartonellosis, 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 immunocompetent adult presents to the emergency department with several days of high fever, severe headache, malaise, and a maculopapular rash after recent exposure to kittens; blood cultures and serology are pending but clinical suspicion is for systemic infection due to Bartonella species, prompting initiation of diagnostic testing and empiric management. A diagnosis from this group is assigned when laboratory confirmation or strong clinical evidence indicates Bartonella-associated systemic infection. Typical codes: A44.0, A44.9
    • A middle-aged patient with known HIV infection and low CD4 count develops persistent fevers, weight loss, and enlarging cutaneous nodules; biopsy and PCR confirm bacillary angiomatosis caused by Bartonella henselae, requiring targeted antimicrobial therapy and outpatient specialist follow-up. This represents a subacute opportunistic infection where a specific code for localized vascular lesions due to Bartonella is used. Typical codes: A44.1, A44.8
    • An otherwise healthy child is brought to urgent care for a tender, swollen lymph node in the axilla following a cat scratch; examination and regional lymphadenopathy are consistent with cat-scratch disease, and diagnosis is assigned based on exposure history and supportive testing when indicated. This is a localized, often self-limited lymphadenitis caused by Bartonella species requiring a code for localized infection. Typical codes: A44.8, A44.9

    Related Codes

    A30-LEPROSY-HANSEN-S-DISEASE

    ICD-10-CM Code For Leprosy Hansen's Disease: Group Overview

    A31-INFECTION-DUE-TO-OTHER-MYCOBACTERIA

    ICD-10-CM Code For Infection Due To Other Mycobacteria: Group Overview

    A32-LISTERIOSIS

    ICD-10-CM Code For Listeriosis: Group Overview

    A33-TETANUS-NEONATORUM

    ICD-10-CM Code For Tetanus Neonatorum: Group Overview

    A34-OBSTETRICAL-TETANUS

    ICD-10-CM Code For Obstetrical Tetanus: Group Overview

    A35-OTHER-TETANUS

    ICD-10-CM Code For Other Tetanus: Group Overview

    A36-DIPHTHERIA

    ICD-10-CM Code For Diphtheria: Group Overview

    A37-WHOOPING-COUGH

    ICD-10-CM Code For Whooping Cough: Group Overview

    A38-SCARLET-FEVER

    ICD-10-CM Code For Scarlet Fever: Group Overview

    A39-MENINGOCOCCAL-INFECTION

    ICD-10-CM Code For Meningococcal Infection: 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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