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    OpenPayerBilling CodesMalignant neoplasms of ill-defined, other secondary and unspecified sitesICD-10-CM c77-secondary-and-unspecified-lymph-node-neoplasms
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    ICD-10-CM Code For Secondary And Unspecified Malignant Neoplasm Of Lymph Nodes: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group C77 includes secondary and unspecified malignant neoplasms of lymph nodes, covering metastatic involvement of regional and distant lymph nodes and cases where nodal malignancy is not specified. These ICD-10-CM diagnosis codes are used to document clinical scenarios such as metastatic spread from a known primary tumor, nodal involvement detected on imaging or pathology, and to capture extent of disease for staging and management. Accurate coding within the ICD-10-CM C77 group supports proper claim adjudication, complete clinical documentation and appropriate reimbursement.

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    ICD-10-CM C77: Secondary And Unspecified Malignant Neoplasm Of Lymph Nodes Overview

    The ICD-10-CM C77 codes identify secondary and unspecified malignant neoplasms involving lymph nodes and reflect metastatic spread to nodal tissue. These diagnoses target the lymphatic system and are used when a primary malignant neoplasm has metastasized to lymph nodes or when nodal malignancy is unspecified. Accurate coding matters for clinical tracking, staging, and reimbursement because it documents metastatic disease burden and influences claim adjudication.

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    When to Use

    Use a code from this group when documentation indicates metastatic involvement of lymph nodes by a known primary malignancy or when a malignant lymph node is recorded without a specified primary site. Apply the most specific C77 code available that identifies the anatomic location of affected lymph nodes.

    ICD-10-CM Codes

    8 rows

    ICD-10-CM CodeDescription
    C77.0Secondary and unspecified malignant neoplasm of lymph nodes of head, face and neck
    C77.1Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes
    C77.2Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes
    C77.3Secondary and unspecified malignant neoplasm of axilla and upper limb lymph nodes
    C77.4Secondary and unspecified malignant neoplasm of inguinal and lower limb lymph nodes
    C77.5Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes
    C77.8Secondary and unspecified malignant neoplasm of lymph nodes of multiple regions
    C77.9Secondary and unspecified malignant neoplasm of lymph node, unspecified

    DRG Codes

    12 rows

    DRG CodeDescription
    011Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC
    012Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC
    013Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC
    820Lymphoma and Leukemia with Major O.R. Procedures with MCC
    821Lymphoma and Leukemia with Major O.R. Procedures with CC
    822Lymphoma and Leukemia with Major O.R. Procedures without CC/MCC
    823Lymphoma and Non-Acute Leukemia with Other Procedures with MCC
    824Lymphoma and Non-Acute Leukemia with Other Procedures with CC
    825Lymphoma and Non-Acute Leukemia with Other Procedures without CC/MCC
    840Lymphoma and Non-Acute Leukemia with MCC
    841Lymphoma and Non-Acute Leukemia with CC
    842Lymphoma and Non-Acute Leukemia without CC/MCC

    Typical Clinical Scenarios

    • An elderly patient with a known history of breast carcinoma presents with new, painless, firm enlargement of several cervical and supraclavicular lymph nodes discovered on physical exam and confirmed by ultrasound; fine-needle aspiration cytology shows metastatic carcinoma consistent with the known primary, prompting staging and systemic therapy planning. A secondary malignant lymph node diagnosis is assigned to indicate nodal metastasis from the breast primary. Typical codes: C77.0, C77.1
    • A middle-aged patient with previously treated colorectal cancer returns for surveillance with PET-CT that demonstrates isolated pelvic and para-aortic lymph node hypermetabolism without a definite new visceral mass; biopsy of a pelvic node confirms metastatic adenocarcinoma consistent with the colorectal primary, guiding further oncologic management. A code from this group is used to capture secondary malignant involvement of intra-abdominal lymph nodes. Typical codes: C77.4, C77.2
    • An adult presenting to the emergency department with rapidly enlarging, tender axillary lymphadenopathy and fever in the setting of newly diagnosed primary lung cancer; hospital workup including biopsy reveals metastatic disease to regional axillary nodes, complicating staging and immediate symptom control. A secondary malignant lymph node code is assigned to document nodal metastasis as a comorbidity influencing care. Typical codes: C77.5, C77.8

    Related Codes

    C76-MALIGNANT-NEOPLASM-OTHER-ILL-DEFINED-SITES

    ICD-10-CM Code For Malignant Neoplasm Of Other And Ill-Defined Sites: Group Overview

    C78-SECONDARY-MALIGNANT-NEOPLASM-RESPIRATORY-DIGESTIVE

    ICD-10-CM Code For Secondary Malignant Neoplasm Of Respiratory And Digestive Organs: Group Overview

    C79-SECONDARY-MALIGNANT-NEOPLASM

    ICD-10-CM Code For Secondary Malignant Neoplasm Of Other And Unspecified Sites: Group Overview

    C80-MALIGNANT-NEOPLASM-UNSPECIFIED

    ICD-10-CM Code For Malignant Neoplasm Without Specification Of Site: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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