ICD-10-CM Table of Neoplasms · FY 2026 Letter A
Table of Neoplasms: Anatomical Sites Starting With A ICD-10-CM
Home › ICD-10-CM Codes List › Table of Neoplasms › AThe letter A section of the FY 2026 Table of Neoplasms covers 91 anatomical site entries under 36 top-level anatomical sites. Each row carries up to six ICD-10-CM codes, one per behavior column, and sub-entries are indented under their parent exactly as the printed CMS table nests them.
✓ Built from the official CMS FY 2026 dataset Effective Oct 1, 2025 – Sep 30, 2026
91
Anatomical site Entries
36
Top-Level Anatomical sites
Column 1
Malignant Primary
Cancer at site of origin
Column 2
Malignant Secondary
Metastatic spread
Column 3
Ca In Situ
Non-invasive, early stage
Column 4
Benign
Non-cancerous
Column 5
Uncertain Behavior
Behavior undeterminable
Column 6
Unspecified Behavior
Behavior not documented
ICD-10-CM
Table of Neoplasms: A 91 entries 91 of 91 shown
Anatomical Site Malignant Malignant Ca Benign Uncertain Unspecified abdomen, abdominal C76.2 C79.8 D09.8 D36.7 D48.7 D49.89 cavity C76.2 C79.8 D09.8 D36.7 D48.7 D49.89 organ C76.2 C79.8 D09.8 D36.7 D48.7 D49.89 viscera C76.2 C79.8 D09.8 D36.7 D48.7 D49.89 wallSee Also: Neoplasm, abdomen, wall, skin C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 connective tissue C49.4 C79.8 – D21.4 D48.1 D49.2 skin C44.519 – – – – – basal cell carcinoma C44.519 – – – – – specified type NEC C44.599 – – – – – squamous cell carcinoma C44.529 – – – – – abdominopelvic C76.8 C79.8 – D36.7 D48.7 D49.89 accessory sinus – – – – – – acoustic nerve C72.4 C79.49 – D33.3 D43.3 D49.7 adenoid (pharynx) (tissue) C11.1 C79.89 D00.08 D10.6 D37.05 D49.0 adipose tissueSee Also: Neoplasm, connective tissue C49.4 C79.89 – D21.9 D48.1 D49.2 adnexa (uterine) C57.4 C79.89 D07.39 D28.7 D39.8 D49.59 adrenal C74.9 C79.7 D09.3 D35.0 D44.1 D49.7 capsule C74.9 C79.7 D09.3 D35.0 D44.1 D49.7 cortex C74.0 C79.7 D09.3 D35.0 D44.1 D49.7 gland C74.9 C79.7 D09.3 D35.0 D44.1 D49.7 medulla C74.1 C79.7 D09.3 D35.0 D44.1 D49.7 ala nasi (external)See Also: Neoplasm, skin, nose C44.301 C79.2 D04.39 D23.39 D48.5 D49.2 alimentary canal or tract NEC C26.9 C78.80 D01.9 D13.99 D37.9 D49.0 alveolar C03.9 C79.89 D00.03 D10.39 D37.09 D49.0 mucosa C03.9 C79.89 D00.03 D10.39 D37.09 D49.0 lower C03.1 C79.89 D00.03 D10.39 D37.09 D49.0 upper C03.0 C79.89 D00.03 D10.39 D37.09 D49.0 ridge or process C41.1 C79.51 – D16.5 D48.0 D49.2 carcinoma C03.9 C79.8 – – – – lower C03.1 C79.8 – – – – upper C03.0 C79.8 – – – – lower C41.1 C79.51 – D16.5 D48.0 D49.2 mucosa C03.9 C79.89 D00.03 D10.39 D37.09 D49.0 lower C03.1 C79.89 D00.03 D10.39 D37.09 D49.0 upper C03.0 C79.89 D00.03 D10.39 D37.09 D49.0 upper C41.0 C79.51 – D16.4 D48.0 D49.2 sulcus C06.1 C79.89 D00.02 D10.39 D37.09 D49.0 alveolus C03.9 C79.89 D00.03 D10.39 D37.09 D49.0 lower C03.1 C79.89 D00.03 D10.39 D37.09 D49.0 upper C03.0 C79.89 D00.03 D10.39 D37.09 D49.0 ampulla of Vater C24.1 C78.89 D01.5 D13.5 D37.6 D49.0 ankle NEC C76.5 C79.89 D04.7 D36.7 D48.7 D49.89 anorectum, anorectal (junction) C21.8 C78.5 D01.3 D12.9 D37.8 D49.0 antecubital fossa or space C76.4 C79.89 D04.6 D36.7 D48.7 D49.89 antrum (Highmore) (maxillary) C31.0 C78.39 D02.3 D14.0 D38.5 D49.1 pyloric C16.3 C78.89 D00.2 D13.1 D37.1 D49.0 tympanicum C30.1 C78.39 D02.3 D14.0 D38.5 D49.1 anus, anal C21.0 C78.5 D01.3 D12.9 D37.8 D49.0 canal C21.1 C78.5 D01.3 D12.9 D37.8 D49.0 cloacogenic zone C21.2 C78.5 D01.3 D12.9 D37.8 D49.0 marginSee Also: Neoplasm, anus, skin C44.500 C79.2 D04.5 D23.5 D48.5 D49.2 overlapping lesion with rectosigmoid junction or rectum C21.8 – – – – – skin C44.500 C79.2 D04.5 D23.5 D48.5 D49.2 basal cell carcinoma C44.510 – – – – – specified type NEC C44.590 – – – – – squamous cell carcinoma C44.520 – – – – – sphincter C21.1 C78.5 D01.3 D12.9 D37.8 D49.0 aorta (thoracic) C49.3 C79.89 – D21.3 D48.1 D49.2 abdominal C49.4 C79.89 – D21.4 D48.1 D49.2 aortic body C75.5 C79.89 – D35.6 D44.7 D49.7 aponeurosis C49.9 C79.89 – D21.9 D48.1 D49.2 palmar C49.1 C79.89 – D21.1 D48.1 D49.2 plantar C49.2 C79.89 – D21.2 D48.1 D49.2 appendix C18.1 C78.5 D01.0 D12.1 D37.3 D49.0 arachnoid C70.9 C79.49 – D32.9 D42.9 D49.7 cerebral C70.0 C79.32 – D32.0 D42.0 D49.7 spinal C70.1 C79.49 – D32.1 D42.1 D49.7 areola C50.0 C79.81 D05 D24 D48.6 D49.3 arm NEC C76.4 C79.89 D04.6 D36.7 D48.7 D49.89 artery – – – – – – aryepiglottic fold C13.1 C79.89 D00.08 D10.7 D37.05 D49.0 hypopharyngeal aspect C13.1 C79.89 D00.08 D10.7 D37.05 D49.0 laryngeal aspect C32.1 C78.39 D02.0 D14.1 D38.0 D49.1 marginal zone C13.1 C79.89 D00.08 D10.7 D37.05 D49.0 arytenoid (cartilage) C32.3 C78.39 D02.0 D14.1 D38.0 D49.1 fold – – – – – – associated with transplanted organ C80.2 – – – – – atlas C41.2 C79.51 – D16.6 D48.0 D49.2 atrium, cardiac C38.0 C79.89 – D15.1 D48.7 D49.89 auditory C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 canal (external) (skin) C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 internal C30.1 C78.39 D02.3 D14.0 D38.5 D49.1 nerve C72.4 C79.49 – D33.3 D43.3 D49.7 tube C30.1 C78.39 D02.3 D14.0 D38.5 D49.1 opening C11.2 C79.89 D00.08 D10.6 D37.05 D49.0 auricle, earSee Also: Neoplasm, skin, ear C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 auricular canal (external)See Also: Neoplasm, skin, ear C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 internal C30.1 C78.39 D02.3 D14.0 D38.5 D49.2 autonomic nerve or nervous system NEC (see Neoplasm, nerve, peripheral) – – – – – – axilla, axillary C76.1 C79.89 D09.8 D36.7 D48.7 D49.89 foldSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2
Questions About This Page How do I pick the right column? The pathology or clinical documentation names the behavior. When the description of the neoplasm names the behavior, that description overrides the Index guidance, and the matching column supplies the code.
Why are some cells empty? Not every site has a code for every behavior. An empty cell means the classification does not provide a code in that column for that site, and the parent row or the main Index should be consulted.
Related References Source: official CMS FY 2026 ICD-10-CM release, effective October 1, 2025 through September 30, 2026.
