2025 ICD-10-CM Diagnosis Code C73

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Malignant neoplasm of thyroid gland

  • C73 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2025 edition of ICD-10-CM C73 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of C73 – other international versions of ICD-10 C73 may differ.

Use Additional

  • code to identify any functional activity

The following code(s) above C73 contain annotation back-references

 that may be applicable to C73:

Approximate Synonyms

  • Anaplastic thyroid carcinoma
  • Cancer from the thyroid metastatic to lymph nodes of neck
  • Cancer metastatic to lymph node from thyroid
  • Cancer of the thyroglossal duct
  • Cancer of the thyroid
  • Cancer of the thyroid, anaplastic
  • Cancer of the thyroid, follicular
  • Cancer of the thyroid, hurthle cell
  • Cancer of the thyroid, medullary
  • Cancer of the thyroid, metastatic to bone
  • Cancer of the thyroid, papillary
  • Cancer of the thyroid, with metastasis to bilateral lungs
  • Cancer of the thyroid, with metastasis to left lung
  • Cancer of the thyroid, with metastasis to lungs
  • Cancer of the thyroid, with metastasis to right lung
  • Follicular thyroid carcinoma
  • Hurthle cell carcinoma of thyroid
  • Malignant tumor of thyroid gland
  • Medullary thyroid carcinoma
  • Papillary thyroid carcinoma
  • Primary malignant neoplasm of thyroglossal duct
  • Secondary malignant neoplasm of bilateral lungs from thyroid
  • Secondary malignant neoplasm of left lung from thyroid
  • Secondary malignant neoplasm of lungs from thyroid
  • Secondary malignant neoplasm of lymph nodes from thyroid
  • Secondary malignant neoplasm of lymph nodes of neck from thyroid
  • Secondary malignant neoplasm of right lung from thyroid
  • Thyroid cancer metastatic to bone
  • Thyroid cancer metastatic to unspecified site

Clinical Information

  • A primary or metastatic malignant neoplasm affecting the thyroid gland.

ICD-10-CM C73 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

  • 011 Tracheostomy for face, mouth and neck diagnoses or laryngectomy with mcc
  • 012 Tracheostomy for face, mouth and neck diagnoses or laryngectomy with cc
  • 013 Tracheostomy for face, mouth and neck diagnoses or laryngectomy without cc/mcc
  • 643 Endocrine disorders with mcc
  • 644 Endocrine disorders with cc
  • 645 Endocrine disorders without cc/mcc

Convert C73 to ICD-9-CMCode History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change

Code annotations containing back-references to C73:

  • Type 1 Excludes: C75

Diagnosis Index entries containing back-references to C73:

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