EM Coding Alert

Find more tips on distinguishing psychiatric evaluations from E/M services.

Accurate evaluation and management (E/M) coding in behavioral health can be challenging when diagnostic evaluations and medically driven visits occur on the same date of service.

This is the second part of a guide to help clarify how to distinguish psychiatric diagnostic evaluations from separately reportable E/M services when same-day billing may be appropriate, and the documentation and medical necessity requirements needed to support compliant reporting across common outpatient and emergency department (ED) settings. You’ll find some scenarios to try and apply your knowledge, too.

Choosing the Correct Code: Diagnostic Evaluation vs. E/M

At an initial encounter, providers must select one appropriate coding pathway based on the nature of the service performed.

These codes are appropriate to use when performing a comprehensive intake, establishing a new diagnosis or revised diagnosis, or developing an initial treatment plan.

On the other hand, an E/M service may be appropriate to report when the visit is medically driven, the focus is on clinical decision-making or ongoing management, and a full psychiatric intake evaluation is not performed.

Key Requirements for Compliance

You know the ways to distinguish and report the different services, but make sure your reporting is compliant by following these guidelines:

• Different providers: Two clinicians must perform the services. If they are in the same group, you must consider payer rules regarding specialty designation and billing structure.
• Distinct services: Each provider must perform a service that stands on its own and is not duplicative.
• Medical necessity: Both encounters must be clinically justified for the same date.
• Separate documentation: Each provider must maintain complete and distinct documentation.
• No duplication of components: The E/M service must not re-document or re-bill elements already included in the psychiatric diagnostic evaluation.

Example Scenario

A patient presents for an initial visit at a behavioral health clinic. A psychologist performs a full diagnostic intake, including history, mental status exam, and treatment planning. This qualifies for 90791. Later that same day, a psychiatrist evaluates the patient for medication needs, reviews medical history, and initiates pharmacologic treatment, which may qualify for 99204 (Office or other outpatient visit for the evaluation and management of a new patient, which requires a medically appropriate history and/or examination and moderate level of medical decision making. When using total time on the date of the encounter for code selection, 45 minutes must be met or exceeded.) or another appropriate E/M code based on medical decision making (MDM) or time documentation.

In this case, you can report both services because they are performed by different providers, address different aspects of care, and are independently medically necessary.

Caution: If both providers are in the same group practice and share the same specialty designation, or if the services overlap in scope, payers may still deny one of the services. Always verify payer-specific guidance, as some insurers impose stricter limitations on same-day services, even when performed by different providers.

Clinical Scenarios

Scenario 1: A licensed clinical social worker performs a full biopsychosocial assessment, mental status exam, and treatment plan.

Correct code: 90791
Incorrect: 90791 + 99203 (Office or other outpatient visit for the evaluation and management of a new patient, which requires a medically appropriate history and/or examination and low level of medical decision making. When using total time on the date of the encounter for code selection, 30 minutes must be met or exceeded.), because the evaluation already includes assessment components; therefore, an E/M is not separately reportable

Scenario 2: A psychiatrist conducts a full psychiatric evaluation and prescribes medication.

Correct code: 90792 (Psychiatric diagnostic evaluation with medical services)
Incorrect: 90792 + 99204, as medical services are already included in 90792

Scenario 3: A patient returns for medication adjustment and symptom review.

Correct code: 99213 (Office or other outpatient visit for the evaluation and management of an established patient, which requires a medically appropriate history and/or examination and low level of medical decision making. When using total time on the date of the encounter for code selection, 20 minutes must be met or exceeded.) or another appropriate E/M code based on MDM or time documentation (No diagnostic evaluation is performed; therefore, E/M coding is appropriate.)

Remember These Takeaways

Psychiatric diagnostic evaluations are generally limited in frequency, often to once per provider per episode of care. However, payer policies vary, and some may allow reporting every six to 12 months. Repeat evaluations may be justified when there is a significant change in clinical status or a new episode of illness occurs.

Psychiatric diagnostic evaluations already include E/M services, so do not report an E/M code with 90791 or 90792 on the same day — choose one.

Use 90791 for a psychiatric diagnostic evaluation without medical services. Use 90792 for a psychiatric diagnostic evaluation with medical services by a qualified prescribing clinician (e.g., medication assessment/ordering and other medically oriented components).

In general, do not report an office/outpatient E/M code on the same date as 90791 or 90792 for the same provider and the same encounter, because the diagnostic evaluation code set already captures the evaluative work and, for 90792, the medical-services component. Same-day reporting may be possible only when a separately identifiable E/M service is performed by a different practitioner, and payer/National Correct Coding Initiative (NCCI) edits allow, supported by distinct documentation and medical necessity.

Clear distinctions, payer-specific rules, proper documentation, and medical necessity are essential to support compliant reporting, accurate reimbursement, and reduced audit risk.

Sarah Jakubowski, RHIT, CPC, CPMA, Consultant, Pinnacle Enterprise Risk Consulting Services