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2025 ICD-10-CM code Z77.123

Contact with and (suspected) exposure to radon and other naturally occurring radiation.

Z codes are used to document reasons for encounters with healthcare services. If a procedure is performed, a corresponding procedure code must accompany the Z code. Z77.123 is specifically used for suspected exposure, not confirmed conditions resulting from radiation.

Medical necessity for the use of Z77.123 is established when a clinician suspects a patient has been exposed to radon or other naturally occurring radiation and the exposure is a potential health hazard. This may include individuals living in areas with high radon levels, those working in environments with potential radiation exposure, or those with concerning test results. The code is used for risk assessment, counseling, and management of potential health risks related to the exposure.

Clinicians should document the suspected exposure to radon and other naturally occurring radiation, along with any related symptoms or health concerns.It's crucial to differentiate between suspected exposure and confirmed conditions resulting from radiation exposure, which are coded differently. Clinicians may also be involved in risk assessment, counseling, and follow-up care for individuals exposed to radon.

In simple words: Suspected exposure to radon or other natural radiation.

Contact with and (suspected) exposure to radon and other naturally occurring radiation. Excludes2: radiation exposure as the cause of a confirmed condition (W88-W90, X39.0-) and radiation sickness NOS (T66).

Example 1: A patient residing in an area known for high radon levels presents to their physician with concerns about potential exposure. While no symptoms are present, the physician documents the concern using Z77.123., A patient undergoes a radon test in their home, and the results indicate elevated levels. The patient consults with their physician, who documents the exposure using Z77.123 and recommends mitigation measures., A worker in a uranium mine is concerned about potential exposure to naturally occurring radiation. They undergo medical evaluation, and the physician documents the potential exposure using Z77.123 and orders further testing.

Documentation should include details of the suspected exposure, such as the source of radiation, the duration and intensity of exposure, any symptoms experienced, and the results of any relevant tests (e.g., radon testing). It’s also essential to document any recommendations for mitigation or follow-up care.

** Code also any follow-up examination (Z08-Z09).

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