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    OpenPayerBilling CodesInfections of the skin and subcutaneous tissueICD-10-CM l05-pilonidal-cyst-and-sinus
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    ICD-10-CM Code For Pilonidal Cyst And Sinus: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group L05 includes diagnoses for pilonidal cysts and pilonidal sinus, covering infected or noninfected chronic sinus tracts and cystic lesions in the sacrococcygeal region. These ICD-10-CM diagnosis codes are used to document presentations such as acute abscess, chronic draining sinus, or recurrent pilonidal disease, capturing disease severity and local tissue involvement. Accurate coding within the ICD-10-CM L05 group supports proper claim adjudication and complete clinical documentation.

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    ICD-10-CM L05: Pilonidal Cyst And Sinus Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group L05 covers pilonidal cysts and sinuses, which are chronic or recurrent infections of the sacrococcygeal region often containing hair and debris. These conditions involve the skin and subcutaneous tissue and commonly present with pain, drainage, and abscess formation. Accurate coding matters for appropriate claim adjudication and reflection of clinical complexity because treatment options and follow-up depend on disease severity.

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    When to Use

    Use a code from this group when documenting a clinical encounter for a patient with a pilonidal cyst, pilonidal sinus, or related abscess in the sacrococcygeal area. Select specific codes within the group to reflect acute versus chronic presentation and presence or absence of draining sinus or abscess.

    ICD-10-CM Codes

    4 rows

    ICD-10-CM CodeDescription
    L05.01Pilonidal cyst with abscess
    L05.02Pilonidal sinus with abscess
    L05.91Pilonidal cyst without abscess
    L05.92Pilonidal sinus without abscess

    DRG Codes

    2 rows

    DRG CodeDescription
    602Cellulitis with MCC
    603Cellulitis without MCC

    Typical Clinical Scenarios

    • A 22-year-old male presents to the emergency department with severe midline sacrococcygeal pain, erythema, and a fluctuant swollen mass after 48 hours of worsening tenderness and fever. Physical exam shows an obvious draining sinus with purulent discharge consistent with an acute infected pilonidal abscess; incision and drainage is performed and antibiotics started. A diagnosis from this group is assigned for an acute pilonidal infection with abscess formation. Typical codes: L05.01, L05.02
    • A 35-year-old female seen in primary care reports chronic intermittent drainage and recurrent small pits at the sacrococcygeal cleft for the past 2 years, with occasional local discomfort but no systemic signs. Clinical assessment documents a noninfected, draining pilonidal sinus without current cellulitis or abscess; conservative management and referral for elective surgical excision are discussed. A diagnosis from this group is used to capture the chronic, nonpurulent pilonidal sinus. Typical codes: L05.91, L05.92
    • A 45-year-old diabetic man is admitted with spreading cellulitis of the lower back originating from a previously undiagnosed pilonidal sinus; he has tachycardia and leukocytosis and requires IV antibiotics and surgical debridement. The pilonidal sinus is identified as the source of the skin and subcutaneous infection complicating his systemic illness. Typical codes: L05.02, L05.92

    Related Codes

    L00-STAPHYLOCOCCAL-SCALDED-SKIN-SYNDROME

    ICD-10-CM Code For Staphylococcal Scalded Skin Syndrome: Group Overview

    L01-IMPETIGO

    ICD-10-CM Code For Impetigo: Group Overview

    L02-CUTANEOUS-ABSCESS-FURUNCLE-CARBUNCLE

    ICD-10-CM Code For Cutaneous Abscess, Furuncle And Carbuncle: Group Overview

    L03-CELLULITIS-AND-ACUTE-LYMPHANGITIS

    ICD-10-CM Code For Cellulitis And Acute Lymphangitis: Group Overview

    L04-ACUTE-LYMPHADENITIS

    ICD-10-CM Code For Acute Lymphadenitis: Group Overview

    L08-OTHER-LOCAL-INFECTIONS-OF-SKIN

    ICD-10-CM Code For Other Local Infections Of Skin And Subcutaneous Tissue: Group Overview

    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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