ED Coding and Reimbursement Alert

Emergency departments (EDs) across the country have been overwhelmed in the last few months with flu patients. People without regular physicians or whose symptoms become too severe to wait to see their primary-care physician end up in the ED waiting room complaining of nausea, fever, aches and pains. ED coders should be careful when assigning ICD-9 codes for the evaluation and management visits and ensure that they only code what is justified in the medical record.

In most cases, I code the signs and symptoms the patient is experiencing unless the diagnosis influenza is actually written in the chart, advises Mary Morrall, CPC, practice coder with Physician Associates, PC, in Lansing, Mich. But, rarely does the physician actually say it is the flu. Usually, Morrall ends up coding the patients chief complaint(s), such as nausea with vomiting (787.01) and/or chills with fever (780.6).

Unless there are complicating circumstances, the physician rarely orders the viral studies necessary to determine the actual presence of the influenza virus, adds Jeri Leong, CPC, an independent coding consultant based in Honolulu, Hawaii. Most of the time it is a clinical diagnosis based on presenting symptoms, she says. If the physician applies a diagnosis of influenza or flu, the appropriate ICD-9 category is 487.x.

If a definitive diagnosis is not made, Leong also recommends coding the symptoms as the physician documented them.

As you will see below, assigning a specific influenza ICD-9 code requires a significant amount of information about the patients particular illness.

Different Flu Diagnoses

Several diagnosis codes exist within the category of influenza, Leong notes. These are:

- 487.0 influenza with pneumonia,
- 487.1 influenza with other respiratory manifestations, and
- 487.8 influenza with other manifestations.
The last subcategory also includes flu with gastrointestinal (GI) symptoms, she says. However, coders should be sure to differentiate between influenza with GI symptoms (487.8) and intestinal flu (008.8).

Note: Intestinal flu actually indicates a bacterial infection instead of a viral infection with influenza. That is why it would be reported with 008.8 (intestinal infections due to other organisms, not elsewhere classified).

Influenza with pneumonia (487.0) should not be confused with pneumonia due to parainfluenza virus (480.2), Leong says. Payers may question ED visits with a non-specific influenza code (i.e., 487.8, with other manifestations) because it is often difficult to demonstrate the medical necessity or high enough level of acuity in the ED with routine diagnosis such as flu, says Leong.

Providers may wish to send supporting documentation to substantiate the need for ED services for patients with a flu-like illness. These might be modifying factors such as a very young patient, an elderly patient or a patient with chronic conditions affecting treatment.

Coders Can Report Reason [...]