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    OpenPayerBilling CodesMalignant neoplasms of thyroid and other endocrine glandsICD-10-CM c73-malignant-neoplasm-of-thyroid-gland
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    ICD-10-CM Code For Malignant Neoplasm Of Thyroid Gland: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group C73 includes malignant neoplasms of the thyroid gland, covering primary thyroid cancers such as papillary, follicular, medullary, and anaplastic carcinomas and other malignant tumors originating in thyroid tissue. These ICD-10-CM diagnosis codes are used to document clinical scenarios such as initial cancer diagnosis, recurrent or persistent disease, and metastatic involvement of regional structures or distant sites, capturing disease severity, tumor behavior, and organ involvement. Accurate coding within the ICD-10-CM C73 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM C73: Malignant Neoplasm Of Thyroid Gland Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group C73 identifies cancers originating in the thyroid gland, including papillary, follicular, medullary, and anaplastic histologies. These diagnoses target the endocrine system and surrounding cervical structures. Accurate coding is important for clinical documentation, epidemiology, and reimbursement because it captures specific tumor types and anatomic details that affect claim adjudication.

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    When to Use

    Use a code from this group when a patient has a documented primary malignant tumor of the thyroid gland, including initial diagnosis, confirmed recurrence, or residual disease. Codes are applied when documentation specifies thyroid as the primary site or when reporting thyroid cancer for treatment, follow-up, or billing purposes.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    C73Malignant neoplasm of thyroid gland

    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
    643Endocrine Disorders with MCC
    644Endocrine Disorders with CC
    645Endocrine Disorders without CC/MCC

    Typical Clinical Scenarios

    • A 58-year-old woman presents with a progressively enlarging, firm thyroid nodule discovered on routine neck palpation and confirmed by ultrasound showing a solid hypoechoic mass with microcalcifications. Fine-needle aspiration cytology demonstrates malignant follicular-derived cells, and the patient is referred for surgical management; a malignant thyroid neoplasm diagnosis is assigned to document the primary thyroid cancer. Typical codes: C73.
    • A 45-year-old man arrives to an emergency clinic with new-onset hoarseness and dysphagia; laryngoscopy and imaging reveal a locally invasive thyroid mass encroaching on the recurrent laryngeal nerve and esophagus. Given the symptomatic, locally advanced tumor causing compressive symptoms, a primary malignant thyroid neoplasm diagnosis is recorded to guide staging and urgent treatment planning. Typical codes: C73.
    • A 67-year-old woman with a history of treated thyroid cancer presents for surveillance and is found on neck ultrasound and PET/CT to have pulmonary metastases consistent with spread from her prior thyroid malignancy. The encounter documents metastatic disease originating from the thyroid primary and the active malignant thyroid diagnosis is assigned to indicate recurrent/metastatic disease. Typical codes: C73.

    Related Codes

    C74-MALIGNANT-NEOPLASM-OF-ADRENAL-GLAND

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

    C75-MALIGNANT-NEOPLASM-OTHER-ENDOCRINE-GLANDS

    ICD-10-CM Code For Malignant Neoplasm Of Other Endocrine Glands And Related Structures: 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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