An advance notice before a potentially noncovered test

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

Chart gym · Original fictional record

Service date: 2026-09-08 · Professional outpatient claim; Original Medicare unless stated otherwise

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

Reason for testing

Fictional patient June Avery, age 72, has fatigue of no specified type. The treating physician orders a laboratory test to investigate the symptom. The current note does not diagnose a vitamin deficiency or another definite cause. The record is deliberately limited to the supported fatigue diagnosis; the coder must not add a diagnosis merely to obtain coverage.

Coverage review

The patient has Original Medicare, is not enrolled in Medicare Advantage and is not dually eligible for Medicaid. Before the service, staff check the applicable current policy and reasonably expect this otherwise covered type of test to be denied in this particular circumstance for lack of medical necessity. Treat that coverage finding as an explicit fact of this exercise; no specific test-wide exclusion or numerical frequency rule is being asserted.

Advance discussion

While the patient can still decline, trained staff provide the current CMS-R-131 notice. It identifies the proposed test, the specific expected denial reason in understandable language and a reasonable estimated cost. Staff explain the choices, answer questions and give time to decide without pressure. The notice does not contain a blanket warning about every possible future service.

Patient choice and service

The patient selects Option 1, asks to receive the test and have Medicare billed, and signs and dates the completed notice before collection. Staff give her a copy. The test is then performed as ordered. No diagnosis beyond fatigue is established in the completed packet available for this coding exercise.

Billing question

The proposed workflow changes the diagnosis to an unconfirmed vitamin deficiency, sends only a private bill and describes the notice as a promise that Medicare will deny. Review the supported diagnosis, the effect of the patient’s actual choice and the limits of an advance notice. Separate the notice process from the eventual Medicare decision.

Your coding worksheet

Identify the reason for this encounter and the supported diagnoses.
List the services actually completed and the applicable code sets.
Use your books to select final codes, units and any supported modifiers.
Sequence the diagnoses and explain the relevant instruction.
Review included work and any separate coverage question. Explain why the strongest alternative does not fit.

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 completed packet supports fatigue without a specified type, routed through the Index to R53.83. It does not support vitamin deficiency. Never substitute an unsupported diagnosis to fit a coverage policy.
The exercise explicitly states an individualized expected medical-necessity denial for an otherwise covered service type, before treatment. That is different from assuming every patient needs an ABN or that every service is excluded.
The current notice must identify the specific service, the reason nonpayment is expected and an appropriate cost estimate, with a meaningful opportunity to choose. A blanket or retroactive signature does not recreate this process.
Option 1 asks for the service and a Medicare claim so that the beneficiary receives an official payment decision and can use applicable appeal rights. It is not the no-claim choice. Follow the current claim instructions for the signed-notice circumstance.
The ABN does not guarantee denial or guarantee successful liability transfer in every circumstance. Medicare makes the payment decision, and the validity of the notice and applicable rules still matter.
The record excludes Medicare Advantage and dual eligibility to avoid silently applying their different notice or collection rules. In a real case, confirm the actual coverage arrangement and current instructions rather than copying this scenario’s assumption.

Reference sections: CMS April2026 ABN tutorial; claims30 40.2/50.8; R53.83

Practice the linked chart questions

Review the lesson

Sources

CMS — Advance Beneficiary Notice of Non-coverage Tutorial. April 2026. Accessed 2026-09-12.
CMS — Medicare Claims Processing Manual Chapter30: Financial Liability Protections. 2026. Accessed 2026-09-12.
CDC NCHS — ICD-10-CM April1,2026 Index and Tabular XML. April1–September30,2026. Accessed 2026-09-12.
CDC/NCHS and CMS — ICD-10-CM April 1 2026 Guidelines. FY2026 April. Accessed 2026-09-10.

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