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    v1.0.30
    OpenPayerBilling CodesMalignant neoplasms of lip, oral cavity and pharynxICD-10-CM c11-malignant-neoplasm-of-nasopharynx
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    ICD-10-CM Code For Malignant Neoplasm Of Nasopharynx: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group C11 includes malignant neoplasms arising in the nasopharynx, covering primary tumors of the nasopharyngeal mucosa and closely related subsites. These ICD-10-CM diagnosis codes are used to document clinical encounters for nasopharyngeal cancer, including tumor location, laterality when applicable, and involvement of regional structures or nodes. Accurate coding within the ICD-10-CM C11 group supports proper claim adjudication and complete clinical documentation and appropriate reimbursement.

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    ICD-10-CM C11: Malignant Neoplasm Of Nasopharynx Overview

    The ICD-10-CM C11 group represents malignant tumors originating in the nasopharynx, the upper part of the throat behind the nose. These diagnoses target head and neck oncology and associated structures, often involving local invasion or regional lymph nodes. Accurate coding matters for reimbursement because it ensures claims reflect the complexity of cancer care and supports appropriate payment for oncology services.

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    When to Use

    Use a code from this group when a patient has a confirmed primary malignant neoplasm of the nasopharynx documented by clinical, radiologic, or pathologic findings. Apply codes that reflect the specific nasopharyngeal subsite and documented extent of disease, including regional lymph node involvement when noted.

    ICD-10-CM Codes

    6 rows

    ICD-10-CM CodeDescription
    C11.0Malignant neoplasm of superior wall of nasopharynx
    C11.1Malignant neoplasm of posterior wall of nasopharynx
    C11.2Malignant neoplasm of lateral wall of nasopharynx
    C11.3Malignant neoplasm of anterior wall of nasopharynx
    C11.8Malignant neoplasm of overlapping sites of nasopharynx
    C11.9Malignant neoplasm of nasopharynx, 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 adult patient presents to the emergency department with sudden-onset unilateral nasal obstruction, recurrent epistaxis, and worsening cranial neuropathic pain; nasal endoscopy and imaging reveal a bulky mass centered in the nasopharynx extending to the Rosenmüller’s fossa. Biopsy confirms a primary nasopharyngeal carcinoma, and the diagnosis is assigned at initial presentation to guide staging and urgent oncology referral. Typical codes: C11.0, C11.1
    • A middle-aged patient in follow-up after definitive chemoradiation for a known nasopharyngeal malignancy reports persistent eustachian tube dysfunction and conductive hearing loss; surveillance endoscopy shows residual tumor confined to the posterior nasopharyngeal wall without skull base invasion. Ongoing management and documentation of the site-specific recurrent or persistent nasopharyngeal malignancy prompt assignment of a location-specific code from this group. Typical codes: C11.2, C11.3
    • An elderly patient with a long-standing nasopharyngeal carcinoma develops progressive cranial nerve deficits and MRI demonstrates skull base erosion with intracranial extension and regional nodal disease; care is focused on symptom control and palliative measures. The advanced local extension and specific nasopharyngeal subsite involvement are coded to reflect the malignant neoplasm causing complications. Typical codes: C11.8, C11.9

    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

    C04-MALIGNANT-NEOPLASM-OF-FLOOR-OF-MOUTH

    ICD-10-CM Code For Malignant Neoplasm Of Floor Of Mouth: 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

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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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