ICD-10-CM Table of Neoplasms · FY 2026 Letter S
Table of Neoplasms: Anatomical Sites Starting With S ICD-10-CM
Home › ICD-10-CM Codes List › Table of Neoplasms › SThe letter S section of the FY 2026 Table of Neoplasms covers 287 anatomical site entries under 57 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
287
Anatomical site Entries
57
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: S 287 entries 287 of 287 shown
Anatomical Site Malignant Malignant Ca Benign Uncertain Unspecified sacrococcyx, sacrococcygeal C76.3 C79.51 – D16.8 D48.0 D49.2 region C76.3 C79.89 D09.8 D36.7 D48.7 D49.89 sacrouterine ligament C57.3 C79.82 – D28.2 D39.8 D49.59 sacrum, sacral (vertebra) C41.4 C79.51 – D16.8 D48.0 D49.2 salivary gland or duct (major) C08.9 C79.89 D00.00 D11.9 D37.039 D49.0 minor NEC C06.9 C79.89 D00.00 D10.39 D37.04 D49.0 overlapping lesion C08.9 – – – – – parotid C07 C79.89 D00.00 D11.0 D37.030 D49.0 pluriglandular C08.9 C79.89 D00.00 D11.9 D37.039 D49.0 sublingual C08.1 C79.89 D00.00 D11.7 D37.031 D49.0 submandibular C08.0 C79.89 D00.00 D11.7 D37.032 D49.0 submaxillary C08.0 C79.89 D00.00 D11.7 D37.032 D49.0 salpinx (uterine) C57.0 C79.82 D07.39 D28.2 D39.8 D49.59 Santorini's duct C25.3 C78.89 D01.7 D13.6 D37.8 D49.0 scalp C44.40 C79.2 D04.4 D23.4 D48.5 D49.2 basal cell carcinoma C44.41 – – – – – specified type NEC C44.49 – – – – – squamous cell carcinoma C44.42 – – – – – scapula (any part) C40.0 C79.51 – D16.0 – – scapular region C76.1 C79.89 D09.8 D36.7 D48.7 D49.89 scar NECSee Also: Neoplasm, skin, by site C44.90 C79.2 D04.9 D23.9 D48.5 D49.2 sciatic nerve C47.2 C79.89 – D36.13 D48.2 D49.2 sclera C69.4 C79.49 D09.2 D31.4 D48.7 D49.89 scrotum (skin) C63.2 C79.82 D07.61 D29.4 D40.8 D49.59 sebaceous gland – – – – – – sella turcica C75.1 C79.89 D09.3 D35.2 D44.3 D49.7 bone C41.0 C79.51 – D16.4 D48.0 D49.2 semilunar cartilage (knee) C40.2 C79.51 – D16.2 D48.0 D49.2 seminal vesicle C63.7 C79.82 D07.69 D29.8 D40.8 D49.59 septum C30.0 C78.39 D02.3 D14.0 D38.5 D49.1 nasal C30.0 C78.39 D02.3 D14.0 D38.5 D49.1 posterior margin C11.3 C79.89 D00.08 D10.6 D37.05 D49.0 rectovaginal C76.3 C79.89 D09.8 D36.7 D48.7 D49.89 rectovesical C76.3 C79.89 D09.8 D36.7 D48.7 D49.89 urethrovaginal C57.9 C79.82 D07.30 D28.9 D39.9 D49.59 vesicovaginal C57.9 C79.82 D07.30 D28.9 D39.9 D49.59 shoulder NEC C76.4 C79.89 D04.6 D36.7 D48.7 D49.89 sigmoid flexure (lower) (upper) C18.7 C78.5 D01.0 D12.5 D37.4 D49.0 sinus (accessory) C31.9 C78.39 D02.3 D14.0 D38.5 D49.1 bone (any) C41.0 C79.51 – D16.4 D48.0 D49.2 ethmoidal C31.1 C78.39 D02.3 D14.0 D38.5 D49.1 frontal C31.2 C78.39 D02.3 D14.0 D38.5 D49.1 maxillary C31.0 C78.39 D02.3 D14.0 D38.5 D49.1 nasal, paranasal NEC C31.9 C78.39 D02.3 D14.0 D38.5 D49.1 overlapping lesion C31.8 – – – – – pyriform C12 C79.89 D00.08 D10.7 D37.05 D49.0 sphenoid C31.3 C78.39 D02.3 D14.0 D38.5 D49.1 skeleton, skeletal NEC C41.9 C79.51 – D16.9 D48.0 D49.2 Skene's gland C68.1 C79.19 D09.19 D30.8 D41.8 D49.59 skin NOS C44.90 C79.2 D04.9 D23.9 D48.5 D49.2 abdominal wall C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 basal cell carcinoma C44.519 – – – – – specified type NEC C44.599 – – – – – squamous cell carcinoma C44.529 – – – – – ala nasiSee Also: Neoplasm, nose, skin C44.301 C79.2 D04.39 D23.39 D48.5 D49.2 ankleSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 antecubital spaceSee Also: Neoplasm, skin, limb, upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 anus 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 – – – – – armSee Also: Neoplasm, skin, limb, upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 auditory canal (external)See Also: Neoplasm, skin, ear C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 auricle (ear)See 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 axilla, axillary foldSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 backSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 basal cell carcinoma C44.91 – – – – – breast C44.501 C79.2 D04.5 D23.5 D48.5 D49.2 basal cell carcinoma C44.511 – – – – – specified type NEC C44.591 – – – – – squamous cell carcinoma C44.521 – – – – – browSee Also: Neoplasm, skin, face C44.309 C79.2 D04.39 D23.39 D48.5 D49.2 buttockSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 calfSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 canthus (eye) (inner) (outer) 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 – – – – – cervical regionSee Also: Neoplasm, skin, neck C44.40 C79.2 D04.4 D23.4 D48.5 D49.2 cheek (external)See Also: Neoplasm, skin, face C44.309 C79.2 D04.39 D23.39 D48.5 D49.2 chest (wall)See Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 chinSee Also: Neoplasm, skin, face C44.309 C79.2 D04.39 D23.39 D48.5 D49.2 clavicular areaSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 clitoris C51.2 C79.82 D07.1 D28.0 D39.8 D49.59 columnellaSee Also: Neoplasm, skin, face C44.309 C79.2 D04.39 D23.39 D48.5 D49.2 conchaSee Also: Neoplasm, skin, ear C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 ear (external) C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 basal cell carcinoma C44.21 – – – – – specified type NEC C44.29 – – – – – squamous cell carcinoma C44.22 – – – – – elbowSee Also: Neoplasm, skin, limb, upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 eyebrowSee Also: Neoplasm, skin, face C44.309 C79.2 D04.39 D23.39 D48.5 D49.2 eyelid 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 – – – – – face NOS C44.300 C79.2 D04.30 D23.30 D48.5 D49.2 basal cell carcinoma C44.310 – – – – – specified type NEC C44.390 – – – – – squamous cell carcinoma C44.320 – – – – – female genital organs (external) C51.9 C79.82 D07.1 D28.0 D39.8 D49.59 clitoris C51.2 C79.82 D07.1 D28.0 D39.8 D49.59 labium NEC C51.9 C79.82 D07.1 D28.0 D39.8 D49.59 majus C51.0 C79.82 D07.1 D28.0 D39.8 D49.59 minus C51.1 C79.82 D07.1 D28.0 D39.8 D49.59 pudendum C51.9 C79.82 D07.1 D28.0 D39.8 D49.59 vulva C51.9 C79.82 D07.1 D28.0 D39.8 D49.59 fingerSee Also: Neoplasm, skin, limb, upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 flankSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 footSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 forearmSee Also: Neoplasm, skin, limb, upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 foreheadSee Also: Neoplasm, skin, face C44.309 C79.2 D04.39 D23.39 D48.5 D49.2 glabellaSee Also: Neoplasm, skin, face C44.309 C79.2 D04.39 D23.39 D48.5 D49.2 gluteal regionSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 groinSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 handSee Also: Neoplasm, skin, limb, upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 head NECSee Also: Neoplasm, skin, scalp C44.40 C79.2 D04.4 D23.4 D48.5 D49.2 heelSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 helixSee Also: Neoplasm, skin, ear C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 hipSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 infraclavicular regionSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 inguinal regionSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 jawSee Also: Neoplasm, skin, face C44.309 C79.2 D04.39 D23.39 D48.5 D49.2 Kaposi's sarcoma – – – – – – kneeSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 labia C51.0 C79.82 D07.1 D28.0 D39.8 D49.59 majora C51.0 C79.82 D07.1 D28.0 D39.8 D49.59 minora C51.1 C79.82 D07.1 D28.0 D39.8 D49.59 legSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 lid (lower) (upper) 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 – – – – – limb NEC C44.90 C79.2 D04.9 D23.9 D48.5 D49.2 basal cell carcinoma C44.91 – – – – – lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 basal cell carcinoma C44.71 – – – – – specified type NEC C44.79 – – – – – squamous cell carcinoma C44.72 – – – – – upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 basal cell carcinoma C44.61 – – – – – specified type NEC C44.69 – – – – – squamous cell carcinoma C44.62 – – – – – lip (lower) (upper) C44.00 C79.2 D04.0 D23.0 D48.5 D49.2 basal cell carcinoma C44.01 – – – – – specified type NEC C44.09 – – – – – squamous cell carcinoma C44.02 – – – – – male genital organs C63.9 C79.82 D07.60 D29.9 D40.8 D49.59 penis C60.9 C79.82 D07.4 D29.0 D40.8 D49.59 prepuce C60.0 C79.82 D07.4 D29.0 D40.8 D49.59 scrotum C63.2 C79.82 D07.61 D29.4 D40.8 D49.59 mastectomy site (skin)See Also: Neoplasm, skin, breast C44.501 C79.2 – – – – specified as breast tissue C50.8 C79.81 – – – – meatus, acoustic (external)See Also: Neoplasm, skin, ear C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 melanotic – – – – – – Merkel cell – – – – – – natesSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 neck C44.40 C79.2 D04.4 D23.4 D48.5 D49.2 basal cell carcinoma C44.41 – – – – – specified type NEC C44.49 – – – – – squamous cell carcinoma C44.42 – – – – – nevus – – – – – – nose (external)See Also: Neoplasm, nose, skin C44.301 C79.2 D04.39 D23.39 D48.5 D49.2 overlapping lesion C44.80 – – – – – basal cell carcinoma C44.81 – – – – – specified type NEC C44.89 – – – – – squamous cell carcinoma C44.82 – – – – – palmSee Also: Neoplasm, skin, limb, upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 palpebra 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 – – – – – penis NEC C60.9 C79.82 D07.4 D29.0 D40.8 D49.59 perianalSee Also: Neoplasm, skin, anus C44.500 C79.2 D04.5 D23.5 D48.5 D49.2 perineumSee Also: Neoplasm, skin, anus C44.500 C79.2 D04.5 D23.5 D48.5 D49.2 pinnaSee Also: Neoplasm, skin, ear C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 plantarSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 popliteal fossa or spaceSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 prepuce C60.0 C79.82 D07.4 D29.0 D40.8 D49.59 pubesSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 sacrococcygeal regionSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 scalp C44.40 C79.2 D04.4 D23.4 D48.5 D49.2 basal cell carcinoma C44.41 – – – – – specified type NEC C44.49 – – – – – squamous cell carcinoma C44.42 – – – – – scapular regionSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 scrotum C63.2 C79.82 D07.61 D29.4 D40.8 D49.59 shoulderSee Also: Neoplasm, skin, limb, upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 sole (foot)See Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 specified sites NEC C44.80 C79.2 D04.8 D23.9 D48.5 D49.2 basal cell carcinoma C44.81 – – – – – specified type NEC C44.89 – – – – – squamous cell carcinoma C44.82 – – – – – specified type NEC C44.99 – – – – – squamous cell carcinoma C44.92 – – – – – submammary foldSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 supraclavicular regionSee Also: Neoplasm, skin, neck C44.40 C79.2 D04.4 D23.4 D48.5 D49.2 templeSee Also: Neoplasm, skin, face C44.309 C79.2 D04.39 D23.39 D48.5 D49.2 thighSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 thoracic wallSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 thumbSee Also: Neoplasm, skin, limb, upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 toeSee Also: Neoplasm, skin, limb, lower C44.70 C79.2 D04.7 D23.7 D48.5 D49.2 tragusSee Also: Neoplasm, skin, ear C44.20 C79.2 D04.2 D23.2 D48.5 D49.2 trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 basal cell carcinoma C44.519 – – – – – specified type NEC C44.599 – – – – – squamous cell carcinoma C44.529 – – – – – umbilicusSee Also: Neoplasm, skin, trunk C44.509 C79.2 D04.5 D23.5 D48.5 D49.2 vulva C51.9 C79.82 D07.1 D28.0 D39.8 D49.59 overlapping lesion C51.8 – – – – – wristSee Also: Neoplasm, skin, limb, upper C44.60 C79.2 D04.6 D23.6 D48.5 D49.2 skull C41.0 C79.51 – D16.4 D48.0 D49.2 soft parts or tissues – – – – – – specified site NEC C76.8 C79.89 D09.8 D36.7 D48.7 D49.89 spermatic cord C63.1 C79.82 D07.69 D29.8 D40.8 D49.59 sphenoid C31.3 C78.39 D02.3 D14.0 D38.5 D49.1 bone C41.0 C79.51 – D16.4 D48.0 D49.2 sinus C31.3 C78.39 D02.3 D14.0 D38.5 D49.1 sphincter C21.1 C78.5 D01.3 D12.9 D37.8 D49.0 anal C21.1 C78.5 D01.3 D12.9 D37.8 D49.0 of Oddi C24.0 C78.89 D01.5 D13.5 D37.6 D49.0 spine, spinal (column) C41.2 C79.51 – D16.6 D48.0 D49.2 bulb C71.7 C79.31 – D33.1 D43.1 D49.6 coccyx C41.4 C79.51 – D16.8 D48.0 D49.2 cord (cervical) (lumbar) (sacral) (thoracic) C72.0 C79.49 – D33.4 D43.4 D49.7 dura mater C70.1 C79.49 – D32.1 D42.1 D49.7 lumbosacral C41.2 C79.51 – D16.6 D48.0 D49.2 marrow NEC C96.9 C79.52 – – D47.9 D49.89 membrane C70.1 C79.49 – D32.1 D42.1 D49.7 meninges C70.1 C79.49 – D32.1 D42.1 D49.7 nerve (root) C47.9 C79.89 – D36.10 D48.2 D49.2 pia mater C70.1 C79.49 – D32.1 D42.1 D49.7 root C47.9 C79.89 – D36.10 D48.2 D49.2 sacrum C41.4 C79.51 – D16.8 D48.0 D49.2 spleen, splenic NEC C26.1 C78.89 D01.7 D13.99 D37.8 D49.0 flexure (colon) C18.5 C78.5 D01.0 D12.3 D37.4 D49.0 stem, brain C71.7 C79.31 – D33.1 D43.1 D49.6 Stensen's duct C07 C79.89 D00.00 D11.0 D37.030 D49.0 sternum C41.3 C79.51 – D16.7 D48.0 D49.2 stomach C16.9 C78.89 D00.2 D13.1 D37.1 D49.0 antrum (pyloric) C16.3 C78.89 D00.2 D13.1 D37.1 D49.0 body C16.2 C78.89 D00.2 D13.1 D37.1 D49.0 cardia C16.0 C78.89 D00.2 D13.1 D37.1 D49.0 cardiac orifice C16.0 C78.89 D00.2 D13.1 D37.1 D49.0 corpus C16.2 C78.89 D00.2 D13.1 D37.1 D49.0 fundus C16.1 C78.89 D00.2 D13.1 D37.1 D49.0 greater curvature NEC C16.6 C78.89 D00.2 D13.1 D37.1 D49.0 lesser curvature NEC C16.5 C78.89 D00.2 D13.1 D37.1 D49.0 overlapping lesion C16.8 – – – – – prepylorus C16.4 C78.89 D00.2 D13.1 D37.1 D49.0 pylorus C16.4 C78.89 D00.2 D13.1 D37.1 D49.0 wall NEC C16.9 C78.89 D00.2 D13.1 D37.1 D49.0 anterior NEC C16.8 C78.89 D00.2 D13.1 D37.1 D49.0 posterior NEC C16.8 C78.89 D00.2 D13.1 D37.1 D49.0 stroma, endometrial C54.1 C79.82 D07.0 D26.1 D39.0 D49.59 stump, cervical C53.8 C79.82 D06.7 D26.0 D39.0 D49.59 subcutaneous (nodule) (tissue) NEC – – – – – – subdural C70.9 C79.32 – D32.9 D42.9 D49.7 subglottis, subglottic C32.2 C78.39 D02.0 D14.1 D38.0 D49.1 sublingual C04.9 C79.89 D00.06 D10.2 D37.09 D49.0 gland or duct C08.1 C79.89 D00.00 D11.7 D37.031 D49.0 submandibular gland C08.0 C79.89 D00.00 D11.7 D37.032 D49.0 submaxillary gland or duct C08.0 C79.89 D00.00 D11.7 D37.032 D49.0 submental C76.0 C79.89 D09.8 D36.7 D48.7 D49.89 subpleural C34.9 C78.0 D02.2 D14.3 D38.1 D49.1 substernal C38.1 C78.1 – D15.2 D38.3 D49.89 sudoriferous, sudoriparous gland, site unspecified C44.90 C79.2 D04.9 D23.9 D48.5 D49.2 specified site – – – – – – supraclavicular region C76.0 C79.89 D09.8 D36.7 D48.7 D49.89 supraglottis C32.1 C78.39 D02.0 D14.1 D38.0 D49.1 suprarenal 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 suprasellar (region) C71.9 C79.31 – D33.2 D43.2 D49.6 supratentorial (brain) NEC C71.0 C79.31 – D33.0 D43.0 D49.6 sweat gland (apocrine) (eccrine), site unspecified C44.90 C79.2 D04.9 D23.9 D48.5 D49.2 specified site – – – – – – sympathetic nerve or nervous system NEC C47.9 C79.89 – D36.10 D48.2 D49.2 symphysis pubis C41.4 C79.51 – D16.8 D48.0 D49.2 synovial membrane – – – – – –
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.
