A chemotherapy-only encounter

Read an original fictional chart, identify the supported facts, and explain your coding workflow.

Chart gym · Original fictional record

Service date: 2026-08-25 · Outpatient professional service

Use your code books and write your reasoning before opening the walkthrough. This exercise contains no real patient information.

Purpose

The patient attends an outpatient infusion encounter chiefly for administration of prescribed antineoplastic chemotherapy for a documented active malignancy.

Services today

The chemotherapy administration occurs as planned. No surgical removal, brachytherapy, or unrelated condition changes the stated purpose of the encounter.

Assessment

The clinician identifies the active malignancy for which chemotherapy is being given. This chart exercise concerns diagnosis sequence rather than selecting an administration procedure code.

Coding task

Choose the applicable first-listed framework and explain where the malignancy belongs. Procedure and drug coding require separate documentation review.

Your coding worksheet

Identify the service chiefly responsible for this encounter.
Locate the specific antineoplastic-therapy sequencing instruction.
Place the therapy encounter and underlying malignancy in the correct relationship.
Explain why an office visit merely discussing future treatment would be a different record.

In your notebook, record the supported facts, your index route, the instructions you checked, and any missing detail that limits your answer.

Compare with the worked explanation

The encounter is chiefly for actual antineoplastic chemotherapy administration.
The specific guideline directs the appropriate therapy-encounter code first.
The malignancy being treated follows as an additional diagnosis under that instruction.
Planning future therapy would not establish today’s therapy-administration purpose. Always code the actual encounter.

Reference sections: I.C.2.e.2

Practice the linked chart questions