SEER Inquiry System - Question 20260020 Details

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Produced: 09/16/2026 1:13 AM

Question 20260020

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Inquiry Details

References:

#1: 2026 SEER Manual. Radiation data items

#2: SEER*Rx

Question:

Radiation Therapy: Is I 131 sodium iodide coded as radiation? SINQ 20031040 says to code Radiation as 3 (radioisotope) but SEER*Rx says not to code it.

Discussion:

Answer:

Code sodium iodine (I 131) therapy in Radiation Treatment Modality as code 13 (Radioisotopes, NOS). Code Radiation External Beam Planning Technique as code 88 (not applicable). Do not code if used in diagnostic procedures.

Radioactive I 131 should be coded when given in therapeutic doses (usually 30-50mCi but could be higher in high risk patients). The same agent is used for diagnostic imaging, but the dose is very small (1-3mCi).

We will update SEER*Rx.

Cancer Site Category:

N/A

Data Item Category:

Radiation Therapy

Other Category:

Update to current manual

Year:

2026