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C78 ICD-10-CM Code: Secondary malignant neoplasm of respiratory and digestive organs

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Official description

C78

Secondary malignant neoplasm of respiratory and digestive organs

ICD-10-CM diagnosis code · United States clinical modification

Where C78 sits

  1. 1

    Chapter 2

    Neoplasms (C00-D49)

  2. 2

    Section

    Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80)

  3. 3

    Category C78

    Secondary malignant neoplasm of respiratory and digestive organs

  4. 4

    Code C78

    Secondary malignant neoplasm of respiratory and digestive organs

Codes under C78

C78 is a non-billable category. Choose the child code that best matches the documented diagnosis.

C78.0Secondary malignant neoplasm of lungC78.1Secondary malignant neoplasm of mediastinumC78.2Secondary malignant neoplasm of pleuraC78.3Secondary malignant neoplasm of other and unspecified respiratory organsC78.4Secondary malignant neoplasm of small intestineC78.5Secondary malignant neoplasm of large intestine and rectumC78.6Secondary malignant neoplasm of retroperitoneum and peritoneumC78.7Secondary malignant neoplasm of liver and intrahepatic bile ductC78.8Secondary malignant neoplasm of other and unspecified digestive organs

Notes for this code

Inclusion terms

No inclusion terms are listed for C78.

Code first

No “code first” instruction is listed for C78.

Use additional code

No “use additional code” instruction is listed for C78.

Excludes1

Conditions that should not be reported together with this code.

  • secondary carcinoid tumors of liver (C7B.02)
  • secondary carcinoid tumors of peritoneum (C7B.04)

Excludes2

Conditions not included here that may be reported separately when present.

  • lymph node metastases (C77.0)

Source and release

Data release
U.S. ICD-10-CM · FY 2027
Effective date
Oct 1, 2026

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Frequently asked questions

What does ICD-10-CM code C78 mean?

C78 is the FY 2027 U.S. ICD-10-CM code for “Secondary malignant neoplasm of respiratory and digestive organs.”

Is C78 a billable or specific ICD-10-CM code?

No. C78 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is C78 located in ICD-10-CM?

C78 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80) (C76–C80), under category C78, Secondary malignant neoplasm of respiratory and digestive organs.

What coding notes are listed for C78?

No inclusion terms are listed for C78 in this reference record. No code-first instruction is listed. Excludes1 notes: secondary carcinoid tumors of liver (C7B.02); secondary carcinoid tumors of peritoneum (C7B.04). Excludes2 notes: lymph node metastases (C77.0).