An accidental overdose with a manifestation

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

Chart gym · Original fictional record

Service date: 2026-09-03 · Outpatient professional service

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

Encounter

An emergency-department record documents an accidental diphenhydramine overdose with drug-induced tachycardia. The provider establishes this relationship in the signed assessment.

Medication circumstances

The patient mistakenly took more than the prescribed dose. The record identifies accidental intent; it does not describe intentional self-harm or an inability to determine intent.

Assessment

The clinician provides active treatment for the diphenhydramine overdose and tachycardia. No intentional self-harm or additional substance is documented.

Task boundary

Determine the poisoning sequence. Do not supply a specific drug entry without the substance documentation or relabel the event as correct-use adverse effect.

Your coding worksheet

Identify the circumstance that distinguishes poisoning from adverse effect.
Preserve the documented intent.
State the order of the poisoning entry and manifestation.
Explain what further information is needed for exact code selection.

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 dose exceeded the prescribed amount, which is improper use.
Accidental intent is documented and should not be replaced by a different intent assumption.
Investigate the poisoning entry first, followed by the manifestation.
Use the documented diphenhydramine, accidental intent, active treatment and tachycardia to investigate complete entries. Confirm all required characters in the Tabular List.

Reference sections: I.C.19.e.1; I.C.19.e.5.b

Practice the linked chart questions