2026 Neoplasms of Uncertain Behavior ICD-10-CM Codes
The 2026 Neoplasms of Uncertain Behavior ICD-10-CM Codes list includes 128 codes used when it cannot be determined if a neoplasm is benign or malignant. These codes should be used only when pathology or clinical evaluation does not provide a definitive classification. Accurate reporting of uncertain behavior neoplasms is critical for proper follow-up, treatment decisions, and claim accuracy.
- Neoplasm of uncertain behavior of brain and central nervous
- Neoplasm of uncertain behavior of endocrine glands (D44)
- Neoplasm of uncertain behavior of female genital organs (D39
- Neoplasm of uncertain behavior of male genital organs (D40)
- Neoplasm of uncertain behavior of meninges (D42)
- Neoplasm of uncertain behavior of middle ear and respiratory
- Neoplasm of uncertain behavior of oral cavity and digestive
- Neoplasm of uncertain behavior of other and unspecified site
- Neoplasm of uncertain behavior of urinary organs (D41)
- Neoplasms of unspecified behavior (D49)
- Other neoplasms of uncertain behavior of lymphoid, hematopoi
- Polycythemia vera (D45)
D43.0 - Neoplasm of uncertain behavior of brain, supratentorial Billable
D43.1 - Neoplasm of uncertain behavior of brain, infratentorial Billable
D43.2 - Neoplasm of uncertain behavior of brain, unspecified Billable
D43.3 - Neoplasm of uncertain behavior of cranial nerves Billable
D43.4 - Neoplasm of uncertain behavior of spinal cord Billable
D43.8 - Neoplasm of uncertain behavior of other specified parts of central nervous system Billable
D43.9 - Neoplasm of uncertain behavior of central nervous system, unspecified Billable
D44.0 - Neoplasm of uncertain behavior of thyroid gland Billable
D44.1 - Neoplasm of uncertain behavior of adrenal gland Non-Billable
D44.10 - Neoplasm of uncertain behavior of unspecified adrenal gland Billable
D44.11 - Neoplasm of uncertain behavior of right adrenal gland Billable
D44.12 - Neoplasm of uncertain behavior of left adrenal gland Billable
D44.2 - Neoplasm of uncertain behavior of parathyroid gland Billable
D44.3 - Neoplasm of uncertain behavior of pituitary gland Billable
D44.4 - Neoplasm of uncertain behavior of craniopharyngeal duct Billable
D44.5 - Neoplasm of uncertain behavior of pineal gland Billable
D44.6 - Neoplasm of uncertain behavior of carotid body Billable
D44.7 - Neoplasm of uncertain behavior of aortic body and other paraganglia Billable
D44.9 - Neoplasm of uncertain behavior of unspecified endocrine gland Billable
D39.0 - Neoplasm of uncertain behavior of uterus Billable
D39.1 - Neoplasm of uncertain behavior of ovary Non-Billable
D39.10 - Neoplasm of uncertain behavior of unspecified ovary Billable
D39.11 - Neoplasm of uncertain behavior of right ovary Billable
D39.12 - Neoplasm of uncertain behavior of left ovary Billable
D39.2 - Neoplasm of uncertain behavior of placenta Billable
D39.8 - Neoplasm of uncertain behavior of other specified female genital organs Billable
D39.9 - Neoplasm of uncertain behavior of female genital organ, unspecified Billable
D40.0 - Neoplasm of uncertain behavior of prostate Billable
D40.1 - Neoplasm of uncertain behavior of testis Non-Billable
D40.10 - Neoplasm of uncertain behavior of unspecified testis Billable
D40.11 - Neoplasm of uncertain behavior of right testis Billable
D40.12 - Neoplasm of uncertain behavior of left testis Billable
D40.8 - Neoplasm of uncertain behavior of other specified male genital organs Billable
D40.9 - Neoplasm of uncertain behavior of male genital organ, unspecified Billable
D38.0 - Neoplasm of uncertain behavior of larynx Billable
D38.1 - Neoplasm of uncertain behavior of trachea, bronchus and lung Billable
D38.2 - Neoplasm of uncertain behavior of pleura Billable
D38.3 - Neoplasm of uncertain behavior of mediastinum Billable
D38.4 - Neoplasm of uncertain behavior of thymus Billable
D38.5 - Neoplasm of uncertain behavior of other respiratory organs Billable
D38.6 - Neoplasm of uncertain behavior of respiratory organ, unspecified Billable
D37.01 - Neoplasm of uncertain behavior of lip Billable
D37.02 - Neoplasm of uncertain behavior of tongue Billable
D37.030 - Neoplasm of uncertain behavior of the parotid salivary glands Billable
D37.031 - Neoplasm of uncertain behavior of the sublingual salivary glands Billable
D37.032 - Neoplasm of uncertain behavior of the submandibular salivary glands Billable
D37.039 - Neoplasm of uncertain behavior of the major salivary glands, unspecified Billable
D37.04 - Neoplasm of uncertain behavior of the minor salivary glands Billable
D37.05 - Neoplasm of uncertain behavior of pharynx Billable
D37.09 - Neoplasm of uncertain behavior of other specified sites of the oral cavity Billable
D37.1 - Neoplasm of uncertain behavior of stomach Billable
D37.2 - Neoplasm of uncertain behavior of small intestine Billable
D37.3 - Neoplasm of uncertain behavior of appendix Billable
D37.4 - Neoplasm of uncertain behavior of colon Billable
D37.5 - Neoplasm of uncertain behavior of rectum Billable
D37.6 - Neoplasm of uncertain behavior of liver, gallbladder and bile ducts Billable
D37.8 - Neoplasm of uncertain behavior of other specified digestive organs Billable
D37.9 - Neoplasm of uncertain behavior of digestive organ, unspecified Billable
D48.0 - Neoplasm of uncertain behavior of bone and articular cartilage Billable
D48.1 - Neoplasm of uncertain behavior of connective and other soft tissue Non-Billable
D48.110 - Desmoid tumor of head and neck Billable
D48.111 - Desmoid tumor of chest wall Billable
D48.112 - Desmoid tumor, intrathoracic Billable
D48.113 - Desmoid tumor of abdominal wall Billable
D48.114 - Desmoid tumor, intraabdominal Billable
D48.115 - Desmoid tumor of upper extremity and shoulder girdle Billable
D48.116 - Desmoid tumor of lower extremity and pelvic girdle Billable
D48.117 - Desmoid tumor of back Billable
D48.118 - Desmoid tumor of other site Billable
D48.119 - Desmoid tumor of unspecified site Billable
D48.19 - Other specified neoplasm of uncertain behavior of connective and other soft tissue Billable
D48.2 - Neoplasm of uncertain behavior of peripheral nerves and autonomic nervous system Billable
D48.3 - Neoplasm of uncertain behavior of retroperitoneum Billable
D48.4 - Neoplasm of uncertain behavior of peritoneum Billable
D48.5 - Neoplasm of uncertain behavior of skin Billable
D48.6 - Neoplasm of uncertain behavior of breast Non-Billable
D48.60 - Neoplasm of uncertain behavior of unspecified breast Billable
D48.61 - Neoplasm of uncertain behavior of right breast Billable
D48.62 - Neoplasm of uncertain behavior of left breast Billable
D48.7 - Neoplasm of uncertain behavior of other specified sites Billable
D48.9 - Neoplasm of uncertain behavior, unspecified Billable
D41.0 - Neoplasm of uncertain behavior of kidney Non-Billable
D41.00 - Neoplasm of uncertain behavior of unspecified kidney Billable
D41.01 - Neoplasm of uncertain behavior of right kidney Billable
D41.02 - Neoplasm of uncertain behavior of left kidney Billable
D41.1 - Neoplasm of uncertain behavior of renal pelvis Non-Billable
D41.10 - Neoplasm of uncertain behavior of unspecified renal pelvis Billable
D41.11 - Neoplasm of uncertain behavior of right renal pelvis Billable
D41.12 - Neoplasm of uncertain behavior of left renal pelvis Billable
D41.2 - Neoplasm of uncertain behavior of ureter Non-Billable
D41.20 - Neoplasm of uncertain behavior of unspecified ureter Billable
D41.21 - Neoplasm of uncertain behavior of right ureter Billable
D41.22 - Neoplasm of uncertain behavior of left ureter Billable
D41.3 - Neoplasm of uncertain behavior of urethra Billable
D41.4 - Neoplasm of uncertain behavior of bladder Billable
D41.8 - Neoplasm of uncertain behavior of other specified urinary organs Billable
D41.9 - Neoplasm of uncertain behavior of unspecified urinary organ Billable
D49.0 - Neoplasm of unspecified behavior of digestive system Billable
D49.1 - Neoplasm of unspecified behavior of respiratory system Billable
D49.2 - Neoplasm of unspecified behavior of bone, soft tissue, and skin Billable
D49.3 - Neoplasm of unspecified behavior of breast Billable
D49.4 - Neoplasm of unspecified behavior of bladder Billable
D49.5 - Neoplasm of unspecified behavior of other genitourinary organs Non-Billable
D49.511 - Neoplasm of unspecified behavior of right kidney Billable
D49.512 - Neoplasm of unspecified behavior of left kidney Billable
D49.519 - Neoplasm of unspecified behavior of unspecified kidney Billable
D49.59 - Neoplasm of unspecified behavior of other genitourinary organ Billable
D49.6 - Neoplasm of unspecified behavior of brain Billable
D49.7 - Neoplasm of unspecified behavior of endocrine glands and other parts of nervous system Billable
D49.81 - Neoplasm of unspecified behavior of retina and choroid Billable
D49.89 - Neoplasm of unspecified behavior of other specified sites Billable
D49.9 - Neoplasm of unspecified behavior of unspecified site Billable
D45 - Polycythemia vera Billable
