malignant neoplasm

DEFINITION of malignant neoplasm

The term malignant neoplasm refers to a cancerous growth or tumor characterized by uncontrolled, abnormal cellular proliferation. Unlike benign tumors, malignant neoplasms have the aggressive ability to invade and destroy adjacent normal tissues and can spread (metastasize) to distant organs via the lymphatic system or bloodstream. Major histological categories include carcinomas (arising from epithelial tissue), sarcomas (arising from connective or mesenchymal tissue), leukemias (affecting blood-forming tissue), and lymphomas (affecting the immune system).

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ETYMOLOGY of malignant neoplasm

latin greek

Component	Origin	Meaning
malignant	Latin malignus	”Wicked”, “bad”, or “malicious”
neo-	Greek neos (νέος)	“New”
-plasm	Greek plasma (πλάσμα)	“Formation, thing formed, or molded”

The combined phrase translates essentially to a “wicked new formation.” Historically, the aggressive, destructive nature of these growths led ancient and medieval physicians to describe them with terms denoting malice or evil behavior, distinguishing them from harmless (“benign”) swellings.

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🔀 ALIASES / ALTERNATE TERMS

• Cancer
• Malignancy
• Malignant tumor
• CA (common clinical abbreviation)
• Primary malignancy (the original site of the tumor)
• Secondary malignancy (a site of metastasis)

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🔗 RELATED TERMS

• Metastasis — the spread of cancer cells from the primary site to other parts of the body
• Carcinoma — a malignant neoplasm of epithelial origin (e.g., skin, lung, breast, prostate)
• Sarcoma — a malignant neoplasm of mesenchymal/connective tissue (e.g., bone, cartilage, muscle)
• Benign neoplasm — a non-cancerous tumor that remains localized and does not invade or metastasize
• Oncology — the branch of medicine focused on diagnosing, treating, and researching cancer
• chemotherapy — the systemic use of chemical agents to destroy or slow the growth of cancer cells
• Carcinoma in situ (CIS) — early-stage cancer that is confined to the layer of cells where it began and has not invaded surrounding tissue

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CODING CORNER

🏥 ICD-10-CM CODES

Primary Malignant Neoplasms (Examples)

Code	Description
C80.1	Malignant (primary) neoplasm, unspecified
C34.11	Malignant neoplasm of upper lobe, right bronchus or lung
C50.111	Malignant neoplasm of central portion of right female breast
C61	Malignant neoplasm of prostate
C43.31	Malignant melanoma of nose

Secondary (Metastatic) Malignant Neoplasms (Examples)

Code	Description
C78.01	Secondary malignant neoplasm of right lung
C78.7	Secondary malignant neoplasm of liver and intrahepatic bile duct
C79.31	Secondary malignant neoplasm of brain
C79.9	Secondary malignant neoplasm of unspecified site

Treatment & History Encounters

Code	Description
Z51.11	Encounter for antineoplastic chemotherapy
Z51.0	Encounter for antineoplastic radiation therapy
Z85.3	Personal history of malignant neoplasm of breast
Z85.118	Personal history of other malignant neoplasm of bronchus and lung

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🔧 COMMON CPT CODES (Oncology-Related Procedures)

CPT Code	Description
11600	Excision, malignant lesion including margins, trunk, arms, or legs; excised diameter 0.5 cm or less
38500	Biopsy or excision of lymph node(s); open, superficial
88305	Level IV - Surgical pathology, gross and microscopic examination (standard for determining malignancy)
96413	Chemotherapy administration, intravenous infusion technique; up to 1 hour, single or initial substance/drug
77402	Radiation treatment delivery, >1 MeV; simple

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⚠️ Coding Note: In ICD-10-CM, coding for a malignant neoplasm strictly requires utilizing the Table of Neoplasms to determine if the site is Primary or Secondary (metastatic). If a patient is presenting solely for the administration of chemotherapy, radiation, or immunotherapy, the Z-code for the therapy (e.g., Z51.11) must be listed as the principal/first-listed diagnosis, followed immediately by the active malignant neoplasm code. If the cancer has been completely excised or eradicated and there is no longer active treatment directed at it, you must use a “Personal history of” (Z85.- category) code instead of the active active malignancy C-code.

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DERIVATIONS of malignant neoplasm

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Query functionality

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Med roots Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms