malignant

DEFINITION of malignant

The term malignant is most commonly used in oncology and pathology to describe a neoplasm (tumor) that is cancerous. Malignant tumors exhibit uncontrolled cellular proliferation, aggressive local invasion into surrounding normal tissues, and the dangerous potential to metastasize (spread) to distant organs via the lymphatic or circulatory systems. Beyond oncology, the term is also used clinically to describe non-cancerous conditions that are exceptionally severe, rapidly progressive, or life-threatening if left untreated (e.g., malignant hyperthermia, neuroleptic malignant syndrome, or the historical term malignant hypertension).

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ETYMOLOGY of malignant

latin

Component	Origin	Meaning
malign-	Latin malignus, from malus	”Bad”, “wicked”, or “malicious”
-ant	Latin -antem	”Characterized by” or “serving in the capacity of”

The Latin term originates from malus (“bad”) combined with the root of gignere (“to bear” or “beget”). Historically, diseases were often personified by their perceived “disposition.” A “malignant” illness was considered wicked, aggressive, and intent on causing destruction or death, standing in stark contrast to “benign” (kind or well-born) conditions.

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🔀 ALIASES / ALTERNATE TERMS

• Cancerous
• Malignancy
• Malignant tumor
• Malignant neoplasm
• CA (common clinical abbreviation)

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🔗 RELATED TERMS

• benign — non-cancerous, localized, and not prone to metastasis.
• Metastasis — the spread of malignant cells from a primary site to a secondary site.
• carcinoma — a malignant tumor arising from epithelial tissue (e.g., lung, breast, colon).
• sarcoma — a malignant tumor arising from mesenchymal/connective tissue (e.g., bone, muscle).
• neoplasm — an abnormal mass of tissue resulting from excessive cell division (can be benign or malignant).
• Oncology — the medical specialty dedicated to the study, diagnosis, and treatment of malignancies.
• Malignant hyperthermia — a severe, potentially fatal reaction to certain anesthetic drugs (not a cancer).
• Neuroleptic malignant syndrome — a life-threatening neurological emergency associated with antipsychotic medication use.

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CODING CORNER

🏥 ICD-10-CM CODES

Malignant Neoplasms (Examples)

Code	Description
C80.1	Malignant (primary) neoplasm, unspecified
C43.9	Malignant melanoma of skin, unspecified
C34.91	Malignant neoplasm of unspecified part of right bronchus or lung
C50.911	Malignant neoplasm of unspecified site of right female breast
C79.9	Secondary malignant neoplasm of unspecified site

Non-Neoplastic “Malignant” Conditions

Code	Description
T88.4XXA	Malignant hyperthermia due to anesthesia, initial encounter
G21.0	Malignant neuroleptic syndrome
H62.40	Malignant otitis externa, unspecified ear

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🔧 COMMON CPT CODES (Malignancy-Related Procedures)

CPT Code	Description
11600	Excision, malignant lesion including margins, trunk, arms, or legs; excised diameter 0.5 cm or less
11642	Excision, malignant lesion including margins, face, ears, eyelids, nose, lips; excised diameter 1.1 to 2.0 cm
38500	Biopsy or excision of lymph node(s); open, superficial
88305	Level IV - Surgical pathology, gross and microscopic examination (the standard path evaluation to confirm malignancy)
96413	Chemotherapy administration, intravenous infusion technique; up to 1 hour, single or initial substance/drug

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⚠️ Coding Note: In the ICD-10-CM manual, the term “malignant” directs coders primarily to the Table of Neoplasms. You must accurately differentiate between Primary (where the cancer originated) and Secondary (where the cancer metastasized). However, always be vigilant of the context: if the provider documents “malignant hypertension,” “malignant hyperthermia,” or “malignant otitis externa,” these are not cancers, and you must consult the Alphabetic Index for these specific clinical syndromes rather than the Neoplasm Table.

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DERIVATIONS of malignant

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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