C78.0 is the authoritative medical code for Secondary malignant neoplasm of lung. This classification is used in medical billing and clinical recording to specify the clinical criteria for secondary malignant neoplasm of lung (ICD-10-CM C78.0), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Secondary malignant neoplasm of lung is a non-billable ICD-10-CM category code C78.0. A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): secondary carcinoid tumors of liver C7B.02; secondary carcinoid tumors of peritoneum C7B.04. Excludes2 (not included here): lymph node metastases C77.0.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for C78.0 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- secondary carcinoid tumors of liver C7B.02
- secondary carcinoid tumors of peritoneum C7B.04
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- lymph node metastases C77.0
Frequently Asked Questions (FAQ) & Clinical Guidance
Can C78.0 be billed directly?
No. C78.0 (Secondary malignant neoplasm of lung) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
What can't be coded together with C78.0?
Per Excludes1 instructions, C78.0 must not be reported with: secondary carcinoid tumors of liver (C7B.02); secondary carcinoid tumors of peritoneum (C7B.04).
Can C78.0 be reported alongside related conditions?
Per Excludes2 instructions, C78.0 and the following may both be reported when both are present: lymph node metastases (C77.0).
Codes in This Family (16)
Official ICD-10-CM classifications in the same code family as C78.0, with their registry titles.
- C78 — Secondary malignant neoplasm of respiratory and digestive organs
- C78.00 — Secondary malignant neoplasm of unspecified lung
- C78.01 — Secondary malignant neoplasm of right lung
- C78.02 — Secondary malignant neoplasm of left lung
- C78.1 — Secondary malignant neoplasm of mediastinum
- C78.2 — Secondary malignant neoplasm of pleura
- C78.3 — Secondary malignant neoplasm of other and unspecified respiratory organs
- C78.30 — Secondary malignant neoplasm of unspecified respiratory organ
- C78.39 — Secondary malignant neoplasm of other respiratory organs
- C78.4 — Secondary malignant neoplasm of small intestine
- C78.5 — Secondary malignant neoplasm of large intestine and rectum
- C78.6 — Secondary malignant neoplasm of retroperitoneum and peritoneum
- C78.7 — Secondary malignant neoplasm of liver and intrahepatic bile duct
- C78.8 — Secondary malignant neoplasm of other and unspecified digestive organs
- C78.80 — Secondary malignant neoplasm of unspecified digestive organ
- C78.89 — Secondary malignant neoplasm of other digestive organs
Neoplasm Table Sites (23)
Anatomical sites from the official ICD-10-CM Table of Neoplasms that map to this code, with the matching behavior column.
- Neoplasm, neoplastic, bronchiogenic, bronchogenic (lung) — Malignant, Secondary
- Neoplasm, neoplastic, bronchiole — Malignant, Secondary
- Neoplasm, neoplastic, bronchus — Malignant, Secondary
- Neoplasm, neoplastic, bronchus, carina — Malignant, Secondary
- Neoplasm, neoplastic, bronchus, lower lobe of lung — Malignant, Secondary
- Neoplasm, neoplastic, bronchus, main — Malignant, Secondary
- Neoplasm, neoplastic, bronchus, middle lobe of lung — Malignant, Secondary
- Neoplasm, neoplastic, bronchus, upper lobe of lung — Malignant, Secondary
- Neoplasm, neoplastic, carina (bronchus) — Malignant, Secondary
- Neoplasm, neoplastic, hilus of lung — Malignant, Secondary
- Neoplasm, neoplastic, lingula, lung — Malignant, Secondary
- Neoplasm, neoplastic, lung — Malignant, Secondary
- Neoplasm, neoplastic, lung, azygos lobe — Malignant, Secondary
- Neoplasm, neoplastic, lung, carina — Malignant, Secondary
- Neoplasm, neoplastic, lung, hilus — Malignant, Secondary
- Neoplasm, neoplastic, lung, lingula — Malignant, Secondary
- Neoplasm, neoplastic, lung, lobe NEC — Malignant, Secondary
- Neoplasm, neoplastic, lung, lower lobe — Malignant, Secondary
- Neoplasm, neoplastic, lung, main bronchus — Malignant, Secondary
- Neoplasm, neoplastic, lung, middle lobe — Malignant, Secondary
- Neoplasm, neoplastic, lung, upper lobe — Malignant, Secondary
- Neoplasm, neoplastic, pulmonary — Malignant, Secondary
- Neoplasm, neoplastic, subpleural — Malignant, Secondary
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code C77.0
Secondary and unspecified malignant neoplasm of lymph nodes of head, face and neck
ICD Code C79.0
Secondary malignant neoplasm of kidney and renal pelvis