Is C85.21 a billable ICD-10 code?

Yes. C85.21 (Mediastinal (thymic) large B-cell lymphoma, lymph nodes of head, face, and neck) is billable and can be used for insurance claims. Always verify payer-specific requirements.

C85.21 ✓ Billable

Mediastinal (thymic) large B-cell lymphoma, lymph nodes of head, face, and neck

Q: What is ICD-10 code C85.21?

ICD-10-CM code C85.21 stands for "Mediastinal (thymic) large B-cell lymphoma, lymph nodes of head, face, and neck". It is a billable code in the Neoplasms chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Neoplasms

Code

C85.21

System

ICD-10-CM

Billable

Yes — valid for submission

Effective

FY2026

Chapter

Neoplasms

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code C85.21?

ICD-10-CM code C85.21 represents Mediastinal (thymic) large B-cell lymphoma, lymph nodes of head, face, and neck. It is a billable diagnosis code in the Neoplasms chapter, effective October 1, 2025 – September 30, 2026.

Is C85.21 billable?

Yes. C85.21 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is C85.21 in?

C85.21 belongs to the Neoplasms chapter (C00–D49) of ICD-10-CM.

Related codes in the C85 category

C85 Other specified and unspecified types of non-Hodgkin lymphoma Non-billable C85.1 Unspecified B-cell lymphoma Non-billable C85.2 Mediastinal (thymic) large B-cell lymphoma Non-billable C85.8 Other specified types of non-Hodgkin lymphoma Non-billable C85.9 Non-Hodgkin lymphoma, unspecified Non-billable C85.10 Unspecified B-cell lymphoma, unspecified site Billable C85.11 Unspecified B-cell lymphoma, lymph nodes of head, face, and neck Billable C85.12 Unspecified B-cell lymphoma, intrathoracic lymph nodes Billable

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