ICD-10-CM Table of Neoplasms · FY 2026 Letter M
Table of Neoplasms: Anatomical Sites Starting With M ICD-10-CM
Home › ICD-10-CM Codes List › Table of Neoplasms › MThe letter M section of the FY 2026 Table of Neoplasms covers 90 anatomical site entries under 39 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
90
Anatomical site Entries
39
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: M 90 entries 90 of 90 shown
Anatomical Site Malignant Malignant Ca Benign Uncertain Unspecified Mackenrodt's ligament C57.7 C79.82 D07.39 D28.7 D39.8 D49.59 malar C41.0 C79.51 – D16.4 D48.0 D49.2 region – – – – – – mammary gland – – – – – – mandible C41.1 C79.51 – D16.5 D48.0 D49.2 alveolar C03.1 C79.89 D00.03 D10.39 D37.09 D49.0 mucosa (carcinoma) C03.1 C79.89 D00.03 D10.39 D37.09 D49.0 ridge or process C41.1 C79.51 – D16.5 D48.0 D49.2 marrow (bone) NEC C96.9 C79.52 – – D47.9 D49.89 mastectomy site (skin)See Also: Neoplasm, breast, skin C44.501 C79.2 – – – – specified as breast tissue C50.8 C79.81 – – – – mastoid (air cells) (antrum) (cavity) C30.1 C78.39 D02.3 D14.0 D38.5 D49.1 bone or process C41.0 C79.51 – D16.4 D48.0 D49.2 maxilla, maxillary (superior) C41.0 C79.51 – D16.4 D48.0 D49.2 alveolar C03.0 C79.89 D00.03 D10.39 D37.09 D49.0 mucosa C03.0 C79.89 D00.03 D10.39 D37.09 D49.0 ridge or process (carcinoma) C41.0 C79.51 – D16.4 D48.0 D49.2 antrum C31.0 C78.39 D02.3 D14.0 D38.5 D49.1 carcinoma C03.0 C79.51 – – – – inferior – – – – – – sinus C31.0 C78.39 D02.3 D14.0 D38.5 D49.1 meatus external (ear)See Also: Neoplasm, skin, ear C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 Meckel diverticulum, malignant C17.3 C78.4 D01.49 D13.39 D37.2 D49.0 mediastinum, mediastinal C38.3 C78.1 – D15.2 D38.3 D49.89 anterior C38.1 C78.1 – D15.2 D38.3 D49.89 posterior C38.2 C78.1 – D15.2 D38.3 D49.89 medulla C74.1 C79.7 D09.3 D35.0 D44.1 D49.7 adrenal C74.1 C79.7 D09.3 D35.0 D44.1 D49.7 oblongata C71.7 C79.31 – D33.1 D43.1 D49.6 meibomian gland C44.10 C79.2 D04.1 D23.1 D48.5 D49.2 basal cell carcinoma C44.11 – – – – – sebaceous cell C44.13 – – – – – specified type NEC C44.19 – – – – – squamous cell carcinoma C44.12 – – – – – melanoma – – – – – – meninges C70.9 C79.49 – D32.9 D42.9 D49.7 brain C70.0 C79.32 – D32.0 D42.0 D49.7 cerebral C70.0 C79.32 – D32.0 D42.0 D49.7 cranial C70.0 C79.32 – D32.0 D42.0 D49.7 intracranial C70.0 C79.32 – D32.0 D42.0 D49.7 spinal (cord) C70.1 C79.49 – D32.1 D42.1 D49.7 meniscus, knee joint (lateral) (medial) C40.2 C79.51 – D16.2 D48.0 D49.2 Merkel cell – – – – – – mesentery, mesenteric C48.1 C78.6 – D20.1 D48.4 D49.0 mesoappendix C48.1 C78.6 – D20.1 D48.4 D49.0 mesocolon C48.1 C78.6 – D20.1 D48.4 D49.0 mesopharynx – – – – – – mesosalpinx C57.1 C79.82 D07.39 D28.2 D39.8 D49.59 mesothelial tissue – – – – – – mesothelioma – – – – – – mesovarium C57.1 C79.82 D07.39 D28.2 D39.8 D49.59 metacarpus (any bone) C40.1 C79.51 – D16.1 – – metastatic NECSee Also: Neoplasm, by site, secondary – C79.9 – – – – metatarsus (any bone) C40.3 C79.51 – D16.3 – – midbrain C71.7 C79.31 – D33.1 D43.1 D49.6 milk duct – – – – – – mons C51.9 C79.82 D07.1 D28.0 D39.8 D49.59 pubis C51.9 C79.82 D07.1 D28.0 D39.8 D49.59 veneris C51.9 C79.82 D07.1 D28.0 D39.8 D49.59 motor tract C72.9 C79.49 – D33.9 D43.9 D49.7 brain C71.9 C79.31 – D33.2 D43.2 D49.6 cauda equina C72.1 C79.49 – D33.4 D43.4 D49.7 spinal C72.0 C79.49 – D33.4 D43.4 D49.7 mouth C06.9 C79.89 D00.00 D10.30 D37.09 D49.0 book-leaf C06.89 C79.89 – – – – floor C04.9 C79.89 D00.06 D10.2 D37.09 D49.0 anterior portion C04.0 C79.89 D00.06 D10.2 D37.09 D49.0 lateral portion C04.1 C79.89 D00.06 D10.2 D37.09 D49.0 overlapping lesion C04.8 – – – – – overlapping NEC C06.80 – – – – – roof C05.9 C79.89 D00.00 D10.39 D37.09 D49.0 specified part NEC C06.89 C79.89 D00.00 D10.39 D37.09 D49.0 vestibule C06.1 C79.89 D00.00 D10.39 D37.09 D49.0 mucosa C03.9 C79.89 D00.03 D10.39 D37.09 D49.0 alveolar (ridge or process) 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 buccal C06.0 C79.89 D00.02 D10.39 D37.09 D49.0 cheek C06.0 C79.89 D00.02 D10.39 D37.09 D49.0 lip – – – – – – nasal C30.0 C78.39 D02.3 D14.0 D38.5 D49.1 oral C06.0 C79.89 D00.02 D10.39 D37.09 D49.0 Mullerian duct C57.7 C79.82 D07.39 D28.7 D39.8 D49.59 female C57.7 C79.82 D07.39 D28.7 D39.8 D49.59 male C63.7 C79.82 D07.69 D29.8 D40.8 D49.59 muscleSee Also: Neoplasm, connective tissue C69.6 C79.49 D09.2 D31.6 D48.7 D49.89 extraocular C69.6 C79.49 D09.2 D31.6 D48.7 D49.89 myocardium C38.0 C79.89 – D15.1 D48.7 D49.89 myometrium C54.2 C79.82 D07.0 D26.1 D39.0 D49.59 myopericardium C38.0 C79.89 – D15.1 D48.7 D49.89
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.
