ICD-10-CM Table of Neoplasms — O
Find the site first, then the column matching the behavior stated in the diagnosis. Behavior must come from the pathology report, not from the site alone.
29 entries.
| Term | Codes by circumstance |
|---|---|
| occipital, bone | Malignant, primary:C41.0Malignant, secondary:C79.51Uncertain behavior:D48.0Unspecified behavior:D49.2 |
| occipital, lobe or pole, brain | Malignant, primary:C71.4Malignant, secondary:C79.31Benign:D33.0Uncertain behavior:D43.0Unspecified behavior:D49.6 |
| olfactory nerve or bulb | Malignant, secondary:C79.49Benign:D33.3Uncertain behavior:D43.3Unspecified behavior:D49.7 |
| olive (brain) | Malignant, primary:C71.7Malignant, secondary:C79.31Benign:D33.1Uncertain behavior:D43.1Unspecified behavior:D49.6 |
| omentum | Malignant, primary:C48.1Malignant, secondary:C78.6Benign:D20.1Uncertain behavior:D48.4Unspecified behavior:D49.0 |
| operculum (brain) | Malignant, primary:C71.0Malignant, secondary:C79.31Benign:D33.0Uncertain behavior:D43.0Unspecified behavior:D49.6 |
| optic nerve, chiasm, or tract | Malignant, secondary:C79.49Benign:D33.3Uncertain behavior:D43.3Unspecified behavior:D49.7 |
| oral (cavity) | Malignant, primary:C06.9Malignant, secondary:C79.83Ca in situ:D00.00Benign:D10.30Uncertain behavior:D37.09Unspecified behavior:D49.0 |
| oral (cavity), ill-defined | Malignant, primary:C14.8Malignant, secondary:C79.83Ca in situ:D00.00Benign:D10.30Uncertain behavior:D37.09Unspecified behavior:D49.0 |
| oral (cavity), mucosa | Malignant, primary:C06.0Malignant, secondary:C79.83Ca in situ:D00.02Benign:D10.39Uncertain behavior:D37.09Unspecified behavior:D49.0 |
| orbit | Malignant, secondary:C79.49Uncertain behavior:D48.7Unspecified behavior:D49.89 |
| orbit, autonomic nerve | Malignant, secondary:C79.49Uncertain behavior:D48.7Unspecified behavior:D49.2 |
| orbit, bone | Malignant, primary:C41.0Malignant, secondary:C79.51Uncertain behavior:D48.0Unspecified behavior:D49.2 |
| orbit, eye | Malignant, secondary:C79.49Uncertain behavior:D48.7Unspecified behavior:D49.89 |
| orbit, peripheral nerves | Malignant, secondary:C79.49Uncertain behavior:D48.7Unspecified behavior:D49.2 |
| orbit, soft parts | Malignant, secondary:C79.49Uncertain behavior:D48.7Unspecified behavior:D49.89 |
| organ of Zuckerkandl | Malignant, primary:C75.5Malignant, secondary:C79.89Benign:D35.6Uncertain behavior:D44.7Unspecified behavior:D49.7 |
| oropharynx | Malignant, primary:C10.9Malignant, secondary:C79.89Ca in situ:D00.08Benign:D10.5Uncertain behavior:D37.05Unspecified behavior:D49.0 |
| oropharynx, branchial cleft (vestige) | Malignant, primary:C10.4Malignant, secondary:C79.89Ca in situ:D00.08Benign:D10.5Uncertain behavior:D37.05Unspecified behavior:D49.0 |
| oropharynx, junctional region | Malignant, primary:C10.8Malignant, secondary:C79.89Ca in situ:D00.08Benign:D10.5Uncertain behavior:D37.05Unspecified behavior:D49.0 |
| oropharynx, lateral wall | Malignant, primary:C10.2Malignant, secondary:C79.89Ca in situ:D00.08Benign:D10.5Uncertain behavior:D37.05Unspecified behavior:D49.0 |
| oropharynx, overlapping lesion | Malignant, primary:C10.8 |
| oropharynx, pillars or fauces | Malignant, primary:C09.1Malignant, secondary:C79.89Ca in situ:D00.08Benign:D10.5Uncertain behavior:D37.05Unspecified behavior:D49.0 |
| oropharynx, posterior wall | Malignant, primary:C10.3Malignant, secondary:C79.89Ca in situ:D00.08Benign:D10.5Uncertain behavior:D37.05Unspecified behavior:D49.0 |
| oropharynx, vallecula | Malignant, primary:C10.0Malignant, secondary:C79.89Ca in situ:D00.08Benign:D10.5Uncertain behavior:D37.05Unspecified behavior:D49.0 |
| os, external | Malignant, primary:C53.1Malignant, secondary:C79.82Ca in situ:D06.1Benign:D26.0Uncertain behavior:D39.0Unspecified behavior:D49.59 |
| os, internal | Malignant, primary:C53.0Malignant, secondary:C79.82Ca in situ:D06.0Benign:D26.0Uncertain behavior:D39.0Unspecified behavior:D49.59 |
| ovary | Ca in situ:D07.39Unspecified behavior:D49.59 |
| oviduct | Malignant, secondary:C79.82Ca in situ:D07.39Benign:D28.2Uncertain behavior:D39.8Unspecified behavior:D49.59 |
Read from: CMS/CDC ICD-10-CM release files (tabular list, order file, addenda) — FY2027. All data sources · How to read the labels
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources