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Enter the ICD-O 3rd edition Topography code which describes the anatomical site of the patient's primary tumor. This is a five character field. After the "C", enter the three digit code; the decimal point is already in the correct position.

The International Classification of Diseases for Oncology (ICD-O) 3rd edition, represents an extension of Chapter II of the ICD-10 coding reference. ICD-O permits the coding of all neoplasms by topography, morphology, and cell behavior --  providing greater detail than that permitted with ICD-9 or ICD-10 coding schemes.

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Alphabetic Index - A list of anatomic sites, histologic terms and selected tumor-like lesions and conditions.

Resources for Coding Primary Site for Solid Tumors, in priority order

1.Refer to the introductory pages of the International Classification of Diseases for Oncology, 3rd edition, for a more detailed discussion of the differences between ICD-O and ICD-10, as well as for rules governing the appropriate assignment of ICD-O codes. See also APPENDIX J for errata and clarifications to ICD-O-3rd edition.

2.SEER Program Manual

a.Including Coding Guidelines in Appendix C

3.Solid Tumor Rules

Coding Instructions for Solid Tumors

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