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    OpenPayerBilling CodesMalignant neoplasms of lip, oral cavity and pharynxICD-10-CM c04-malignant-neoplasm-of-floor-of-mouth
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    ICD-10-CM Code For Malignant Neoplasm Of Floor Of Mouth: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group C04 includes malignancies originating on the floor of the mouth, covering primary tumors of the mucosa and adjacent soft tissues in that oral subsite. These ICD-10-CM diagnosis codes are used to document clinical presentations such as tumor site, extent of local invasion, and involvement of regional structures or nodes, capturing disease severity and organ involvement. Accurate coding within the ICD-10-CM C04 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM C04: Malignant Neoplasm Of Floor Of Mouth Overview

    The malignant neoplasm of the floor of mouth group represents cancers arising from the mucosal lining and tissues under the tongue within the oral cavity. These diagnoses target head and neck oncology involving oral structures and regional lymph nodes. Accurate coding matters for clinical tracking, staging communication, and appropriate reimbursement determination.

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    When to Use

    Use a code from this group when documentation identifies a primary malignant neoplasm located on the floor of the mouth. Select the specific code that reflects documented laterality, exact subsite, and any extension to adjacent structures or regional lymph nodes.

    ICD-10-CM Codes

    4 rows

    ICD-10-CM CodeDescription
    C04.0Malignant neoplasm of anterior floor of mouth
    C04.1Malignant neoplasm of lateral floor of mouth
    C04.8Malignant neoplasm of overlapping sites of floor of mouth
    C04.9Malignant neoplasm of floor of mouth, unspecified

    DRG Codes

    6 rows

    DRG CodeDescription
    011Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC
    012Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC
    013Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC
    146Ear, Nose, Mouth and Throat Malignancy with MCC
    147Ear, Nose, Mouth and Throat Malignancy with CC
    148Ear, Nose, Mouth and Throat Malignancy without CC/MCC

    Typical Clinical Scenarios

    • An elderly patient with a several-month history of a non-healing ulcer and progressive pain on the right side of the floor of the mouth presents to an otolaryngology clinic after noticing a firm submucosal mass and ipsilateral cervical lymphadenopathy on exam. Biopsy of the lesion confirms invasive squamous cell carcinoma arising in the floor of mouth; staging workup is initiated for treatment planning. A diagnosis from this group is assigned to capture the primary malignant lesion of the floor of mouth. Typical codes: C04.0, C04.9
    • A middle-aged tobacco and heavy alcohol user arrives at the emergency department with acute bleeding and rapidly enlarging ulcerative lesion under the tongue causing difficulty swallowing and odynophagia; imaging suggests locally advanced tumor with bony involvement. After urgent hemostasis and biopsy, the malignant floor-of-mouth tumor is coded to reflect the anatomic subsite and aggressive presentation. Typical codes: C04.1, C04.8
    • A patient undergoing radiation therapy for a previously diagnosed floor-of-mouth carcinoma returns for follow-up with persistent mucosal ulceration, trismus, and referral for reconstructive surgery planning; the encounter documents the known primary malignancy as the reason for ongoing oncologic management. The code from this group is used to identify the established malignant neoplasm of the floor of mouth as a current condition affecting care. Typical codes: C04.0, C04.9

    Related Codes

    C00-MALIGNANT-NEOPLASM-OF-LIP

    ICD-10-CM Code For Malignant Neoplasm Of Lip: Group Overview

    C01-MALIGNANT-NEOPLASM-BASE-OF-TONGUE

    ICD-10-CM Code For Malignant Neoplasm Of Base Of Tongue: Group Overview

    C02-MALIGNANT-NEOPLASM-OF-TONGUE

    ICD-10-CM Code For Malignant Neoplasm Of Other And Unspecified Parts Of Tongue: Group Overview

    C03-MALIGNANT-NEOPLASM-OF-GUM

    ICD-10-CM Code For Malignant Neoplasm Of Gum: Group Overview

    C05-MALIGNANT-NEOPLASM-OF-PALATE

    ICD-10-CM Code For Malignant Neoplasm Of Palate: Group Overview

    C06-MALIGNANT-NEOPLASM-OF-MOUTH

    ICD-10-CM Code For Malignant Neoplasm Of Other And Unspecified Parts Of Mouth: Group Overview

    C07-MALIGNANT-NEOPLASM-OF-PAROTID-GLAND

    ICD-10-CM Code For Malignant Neoplasm Of Parotid Gland: Group Overview

    C08-MALIGNANT-SALIVARY-GLAND-NEOPLASMS

    ICD-10-CM Code For Malignant Neoplasm Of Other And Unspecified Major Salivary Glands: Group Overview

    C09-MALIGNANT-NEOPLASM-OF-TONSIL

    ICD-10-CM Code For Malignant Neoplasm Of Tonsil: Group Overview

    C10-MALIGNANT-NEOPLASM-OF-OROPHARYNX

    ICD-10-CM Code For Malignant Neoplasm Of Oropharynx: 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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