C77.1
✓ Billable
Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes
ICD-10-CM · FY2026 · Neoplasms
Code
C77.1
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 C77.1?
ICD-10-CM code C77.1 represents Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes. It is a billable diagnosis code in the Neoplasms chapter, effective October 1, 2025 – September 30, 2026.
Is C77.1 billable?
Yes. C77.1 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is C77.1 in?
C77.1 belongs to the Neoplasms chapter (C00–D49) of ICD-10-CM.
Related codes in the C77 category
C77
Secondary and unspecified malignant neoplasm of lymph nodes
Non-billable
C77.0
Secondary and unspecified malignant neoplasm of lymph nodes of head, face and neck
Billable
C77.2
Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes
Billable
C77.3
Secondary and unspecified malignant neoplasm of axilla and upper limb lymph nodes
Billable
C77.4
Secondary and unspecified malignant neoplasm of inguinal and lower limb lymph nodes
Billable
C77.5
Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes
Billable
C77.8
Secondary and unspecified malignant neoplasm of lymph nodes of multiple regions
Billable
C77.9
Secondary and unspecified malignant neoplasm of lymph node, unspecified
Billable
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