ICD-10-CM diagnosis code
C85.20 Mediastinal (thymic) large B-cell lymphoma, unspecified site
- Billable
- Yes, a complete code (FY2026)
- Chapter
- 2. Neoplasms
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Other codes in C85
44 complete codes in this category.
- C85.15Unspecified B-cell lymphoma, lymph nodes of inguinal region and lower limb
- C85.16Unspecified B-cell lymphoma, intrapelvic lymph nodes
- C85.17Unspecified B-cell lymphoma, spleen
- C85.18Unspecified B-cell lymphoma, lymph nodes of multiple sites
- C85.19Unspecified B-cell lymphoma, extranodal and solid organ sites
- C85.1AUnspecified B-cell lymphoma, in remission
- C85.20Mediastinal (thymic) large B-cell lymphoma, unspecified site
- C85.21Mediastinal (thymic) large B-cell lymphoma, lymph nodes of head, face, and neck
- C85.22Mediastinal (thymic) large B-cell lymphoma, intrathoracic lymph nodes
- C85.23Mediastinal (thymic) large B-cell lymphoma, intra-abdominal lymph nodes
- C85.24Mediastinal (thymic) large B-cell lymphoma, lymph nodes of axilla and upper limb
- C85.25Mediastinal (thymic) large B-cell lymphoma, lymph nodes of inguinal region and lower limb
Documentation tips
- Make sure the note supports every element of the title, “Mediastinal (thymic) large B-cell lymphoma, unspecified site”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to C85.
The international WHO ICD-10 also has C85, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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