OASIS Scoring · Overall Anxiety Severity and Impairment Scale

The OASIS is a 5-item self-report measure of anxiety severity and impairment that works across any anxiety disorder, making it well suited to ongoing symptom monitoring.

About the OASIS

The Overall Anxiety Severity and Impairment Scale was developed by Sonya Norman and colleagues as a brief, continuous measure of how severe and impairing a person's anxiety is ^[1].

Rather than asking about one specific disorder, the OASIS is transdiagnostic: it can be used with any single anxiety disorder, with several at once, or with subthreshold anxiety symptoms ^[1]. That makes it useful for tracking change in mixed clinical groups.

It is a self-report measure, developed in college students and validated in adults referred from primary care ^[2]. It takes about a minute to complete, so it fits into routine measurement-based care alongside disorder-specific screens.

What does the OASIS measure?

The OASIS samples five facets of anxiety over the past week:

• Frequency of anxious feelings,
• Intensity of anxiety,
• Avoidance of feared situations or activities,
• Interference with work, school, or home responsibilities, and
• Interference with social life and relationships.

Together these capture both the severity of anxiety and the functional impairment it causes, on a single underlying dimension.

How do you give the OASIS?

The OASIS takes about 1 minute and is self-administered. Non-clinical staff can hand out and collect the form, but a licensed clinician interprets the score in the context of history and functional impact. Because it is brief, it can be given at every visit to monitor treatment response.

How do you score and interpret the OASIS?

How to score the OASIS

Each of the 5 items is rated on a 0 to 4 scale reflecting the past week:

• 0 indicates little or no anxiety or impairment.
• 4 indicates extreme or constant anxiety or impairment.

The five item scores are summed for a total ranging 0–20; higher scores indicate greater anxiety severity and impairment. The scorer at the top of this page places a total against the cut-score.

OASIS cut-point

A total of ≥8 is the validated screening cut-score: in a large primary-care sample it correctly classified about 87% of participants for the presence of an anxiety disorder ^[2].

Because the scale is continuous, the total is also useful as a severity index to track change over time, not only as a pass/fail screen. A positive screen warrants full clinical evaluation; it is not a conclusion on its own.

Psychometric properties

• Non-clinical sample. In 711 college students, the OASIS showed a single-factor structure, excellent 1-month test-retest reliability, and convergent and divergent validity ^[1].
• Clinical sample. In 1,036 primary-care adults referred to an anxiety treatment study, factor analyses confirmed a single factor with high internal consistency. Scores correlated strongly with other anxiety measures and weakly with unrelated constructs, and a cut-score of 8 correctly classified 87% of the sample as having an anxiety diagnosis or not ^[2].

Limitations

• Screening, not a clinical conclusion. A positive OASIS indicates symptoms consistent with clinically significant anxiety and warrants full evaluation.
• Not disorder-specific. Its transdiagnostic design is a strength for monitoring but means it does not identify which anxiety condition is present.
• Self-report. Scores reflect the past week and self-perception, so they are best read alongside clinical history and over repeated administrations. In the clinical validation, convergent validity was tested only against other self-report anxiety measures, not clinician-rated ones.

For generalized anxiety specifically, pair with the GAD-7; for broader distress, the DASS-21; for youth anxiety, the SCARED.

Billing the OASIS (CPT 96127)

OASIS administration qualifies for reimbursement under CPT code 96127 (brief emotional/behavioural assessment) when it is scored and documented with clinical interpretation. Medicare's Medically Unlikely Edit caps 96127 at 4 units per date of service; commercial payer limits vary, so confirm your contract. Its brevity makes it practical to administer and bill at repeat monitoring visits.