2022 ICD-10-CM Diagnosis Code C04.9: Malignant Neoplasm Of ...

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2025

  1. ICD-10-CM Codes
    2. ›
  2. C00-D49
    3. ›
  3. C00-C14
    4. ›
  4. C04-
    5. ›
  5. 2025 ICD-10-CM Diagnosis Code C04.9
2025 ICD-10-CM Diagnosis Code C04.9

Malignant neoplasm of floor of mouth, unspecified

    2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Billable/Specific Code
  • C04.9 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 C04.9 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of C04.9 - other international versions of ICD-10 C04.9 may differ.
The following code(s) above C04.9 contain annotation back-referencesAnnotation Back-ReferencesIn this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to C04.9:
  • C00-D49 2025 ICD-10-CM Range C00-D49

    NeoplasmsNote
    • Functional activity
    • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
    • Morphology [Histology]
    • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
    • Primary malignant neoplasms overlapping site boundaries
    • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
    • Malignant neoplasm of ectopic tissue
    • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
    Neoplasms

  • C04 ICD-10-CM Diagnosis Code C04

    Malignant neoplasm of floor of mouth

      2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Non-Billable/Non-Specific Code
    Use Additional
    • code to identify:
    • alcohol abuse and dependence (F10.-)
    • history of tobacco dependence (Z87.891)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
    Malignant neoplasm of floor of mouth
Approximate Synonyms
  • Cancer of the floor of mouth
  • Cancer of the floor of mouth, squamous cell
  • Primary malignant neoplasm of floor of mouth
  • Squamous cell carcinoma of floor of mouth
ICD-10-CM C04.9 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
  • 146 Ear, nose, mouth and throat malignancy with mcc
  • 147 Ear, nose, mouth and throat malignancy with cc
  • 148 Ear, nose, mouth and throat malignancy without cc/mcc

Convert C04.9 to ICD-9-CM

Code 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
ICD-10-CM Codes Adjacent To C04.9 C02.8 Malignant neoplasm of overlapping sites of tongue C02.9 Malignant neoplasm of tongue, unspecified C03 Malignant neoplasm of gum C03.0 Malignant neoplasm of upper gum C03.1 Malignant neoplasm of lower gum C03.9 Malignant neoplasm of gum, unspecified C04 Malignant neoplasm of floor of mouth C04.0 Malignant neoplasm of anterior floor of mouth C04.1 Malignant neoplasm of lateral floor of mouth C04.8 Malignant neoplasm of overlapping sites of floor of mouth C04.9 Malignant neoplasm of floor of mouth, unspecified C05 Malignant neoplasm of palate C05.0 Malignant neoplasm of hard palate C05.1 Malignant neoplasm of soft palate C05.2 Malignant neoplasm of uvula C05.8 Malignant neoplasm of overlapping sites of palate C05.9 Malignant neoplasm of palate, unspecified C06 Malignant neoplasm of other and unspecified parts of mouth C06.0 Malignant neoplasm of cheek mucosa C06.1 Malignant neoplasm of vestibule of mouth C06.2 Malignant neoplasm of retromolar area

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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