2022 ICD-10-CM Diagnosis Code C37

Malignant neoplasm of thymus

    2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
  • C37 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2022 edition of ICD-10-CM C37 became effective on October 1, 2021.
  • This is the American ICD-10-CM version of C37 - other international versions of ICD-10 C37 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as C37. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • malignant carcinoid tumor of the thymus (
    ICD-10-CM Diagnosis Code C7A.091

    Malignant carcinoid tumor of the thymus

      2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
    C7A.091
    )
The following code(s) above C37 contain annotation back-references
Annotation Back-References
In 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 C37:
  • C00-D49
    2022 ICD-10-CM Range C00-D49

    Neoplasms

    Note
    • 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
  • C30-C39
    2022 ICD-10-CM Range C30-C39

    Malignant neoplasms of respiratory and intrathoracic organs

    Includes
    • malignant neoplasm of middle ear
    Type 1 Excludes
    Malignant neoplasms of respiratory and intrathoracic organs
Approximate Synonyms
  • Cancer of the thymus
  • Cancer of the thymus, small cell
  • Cancer of the thymus, squamous cell
  • Cancer of the thymus, thymoma
  • Malignant thymoma
  • Primary malignant neoplasm of thymus
  • Primary small cell neoplasm of thymus
  • Primary squamous cell carcinoma of thymus
Clinical Information
  • Primary or metastatic malignant neoplasm involving the thymus. This category includes malignant thymomas, thymic lymphomas, primary thymic carcinomas, and metastatic carcinomas from other anatomic sites.
  • The thymus is a small organ in your upper chest, under your breastbone. Before birth and during childhood, the thymus helps the body make a type of white blood cell. These cells help protect you from infections. Cancer of the thymus is rare. You are more likely to get it if you have other diseases such as myasthenia gravis, lupus or rheumatoid arthritis. Sometimes there are no symptoms. Other times, thymus cancer can cause
    • a cough that doesn't go away
    • chest pain
    • trouble breathing
    the most common treatment is surgery to remove the tumor. Other options include radiation and hormone therapy. nih: national cancer institute
ICD-10-CM C37 is grouped within Diagnostic Related Group(s) (MS-DRG v39.0):
  • 826 Myeloproliferative disorders or poorly differentiated neoplasms with major o.r. Procedures with mcc
  • 827 Myeloproliferative disorders or poorly differentiated neoplasms with major o.r. Procedures with cc
  • 828 Myeloproliferative disorders or poorly differentiated neoplasms with major o.r. Procedures without cc/mcc
  • 829 Myeloproliferative disorders or poorly differentiated neoplasms with other procedures with cc/mcc
  • 830 Myeloproliferative disorders or poorly differentiated neoplasms with other procedures without cc/mcc
  • 843 Other myeloproliferative disorders or poorly differentiated neoplastic diagnoses with mcc
  • 844 Other myeloproliferative disorders or poorly differentiated neoplastic diagnoses with cc
  • 845 Other myeloproliferative disorders or poorly differentiated neoplastic diagnoses without cc/mcc

Convert C37 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
Code annotations containing back-references to C37:
  • Type 1 Excludes: C49.3
    , C75
    ICD-10-CM Diagnosis Code C49.3

    Malignant neoplasm of connective and soft tissue of thorax

      2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
    Applicable To
    • Malignant neoplasm of axilla
    • Malignant neoplasm of diaphragm
    • Malignant neoplasm of great vessels
    Type 1 Excludes
    • malignant neoplasm of breast (C50.-)
    • malignant neoplasm of heart (C38.0)
    • malignant neoplasm of mediastinum (C38.1-C38.3)
    • malignant neoplasm of thymus (C37)
    ICD-10-CM Diagnosis Code C75

    Malignant neoplasm of other endocrine glands and related structures

      2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • malignant carcinoid tumors (C7A.0-)
    • malignant neoplasm of adrenal gland (C74.-)
    • malignant neoplasm of endocrine pancreas (C25.4)
    • malignant neoplasm of islets of Langerhans (C25.4)
    • malignant neoplasm of ovary (C56.-)
    • malignant neoplasm of testis (C62.-)
    • malignant neoplasm of thymus (C37)
    • malignant neoplasm of thyroid gland (C73)
    • malignant neuroendocrine tumors (C7A.-)
  • Applicable To: Z85.238
    ICD-10-CM Diagnosis Code Z85.238

    Personal history of other malignant neoplasm of thymus

      2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code POA Exempt
    Applicable To
    • Conditions classifiable to C37

Diagnosis Index entries containing back-references to C37:

ICD-10-CM Codes Adjacent To C37
C34.31 Malignant neoplasm of lower lobe, right bronchus or lung
C34.32 Malignant neoplasm of lower lobe, left bronchus or lung
C34.8 Malignant neoplasm of overlapping sites of bronchus and lung
C34.80 Malignant neoplasm of overlapping sites of unspecified bronchus and lung
C34.81 Malignant neoplasm of overlapping sites of right bronchus and lung
C34.82 Malignant neoplasm of overlapping sites of left bronchus and lung
C34.9 Malignant neoplasm of unspecified part of bronchus or lung
C34.90 Malignant neoplasm of unspecified part of unspecified bronchus or lung
C34.91 Malignant neoplasm of unspecified part of right bronchus or lung
C34.92 Malignant neoplasm of unspecified part of left bronchus or lung
C37 Malignant neoplasm of thymus
C38 Malignant neoplasm of heart, mediastinum and pleura
C38.0 Malignant neoplasm of heart
C38.1 Malignant neoplasm of anterior mediastinum
C38.2 Malignant neoplasm of posterior mediastinum
C38.3 Malignant neoplasm of mediastinum, part unspecified
C38.4 Malignant neoplasm of pleura
C38.8 Malignant neoplasm of overlapping sites of heart, mediastinum and pleura
C39 Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organs
C39.0 Malignant neoplasm of upper respiratory tract, part unspecified
C39.9 Malignant neoplasm of lower respiratory tract, part unspecified

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