5.4 Medicine Services & Non-Invasive Procedures

Medicine Services & Non-Invasive Procedures

The Medicine section (90281-99607) covers a vast array of specialized, non-invasive or minimally invasive services. This section is often referred to as the "catch-all" chapter, as it includes everything from vaccines to psychiatry to cardiology.

1. Immunization Administration and Products

A fundamental rule of coding immunizations is that the service must be broken down into two components: the act of giving the shot, and the substance injected.

The Two-Code Rule

1. Administration Code (90460-90474): This code covers the clinical staff's time and effort to prepare the injection, administer it, and monitor the patient for immediate reactions.
   • Codes vary based on the age of the patient (e.g., pediatric vs. adult) and the route of administration (e.g., percutaneous, intradermal, subcutaneous, intramuscular, oral, or intranasal).
   • If counseling is provided by the physician or a qualified healthcare professional during a pediatric immunization, specific codes (90460-90461) are used.
2. Product Code (90476-90758): This code identifies the specific toxoid or vaccine product (e.g., influenza, hepatitis B, MMR). Even if the state provides the vaccine for free, the product code must still be reported (often with a modifier indicating it was state-supplied or at a zero-dollar charge) for tracking purposes.

Example: A 30-year-old receives a flu shot (intramuscular). You would code the administration (90471) and the specific influenza virus vaccine product code based on the exact dosage and strain.

2. Hydration, Therapeutic, and Diagnostic Injections/Infusions

Coding for infusions and injections given in a facility or physician's office follows a strict hierarchy. Only one "initial" code can be reported per encounter, regardless of the number of different types of infusions administered.

The Hierarchy of Infusions

The order of precedence for choosing the "initial" service is:

1. Chemotherapy and other highly complex drug or biologic infusions
2. Therapeutic, prophylactic, or diagnostic IV infusions
3. Therapeutic, prophylactic, or diagnostic injections
4. Hydration (IV fluids like saline)

Key Terms

• Initial: The primary reason for the encounter or the highest-level service in the hierarchy. Only one "initial" code per encounter.
• Sequential: An infusion of a different substance immediately following the initial infusion through the same IV line.
• Concurrent: An infusion of a different substance at the same time as another infusion through the same IV line.
• Additional Hour: Time-based codes used when a single infusion lasts longer than the time allotted by the base code.

Time Rule: Most initial infusion codes cover up to 1 hour. To bill for an additional hour, at least 31 minutes of that additional hour must pass (e.g., total infusion time of 1 hour and 31 minutes).

3. Psychiatry

Psychiatric coding (90785-90899) differentiates between initial evaluations and ongoing therapy.

Diagnostic Evaluation vs. Psychotherapy

• Psychiatric Diagnostic Evaluation (90791, 90792): Used for the initial assessment of a patient's psychiatric history, mental status, and treatment recommendations. Code 90792 includes medical services (like prescribing medication), whereas 90791 does not.
• Psychotherapy (90832-90838): These codes represent ongoing therapeutic interventions. They are strictly time-based (e.g., 30, 45, or 60 minutes). The time spent must be face-to-face with the patient and/or family member.

Add-on Codes

Psychotherapy can be coded alongside an Evaluation and Management (E/M) code if a significant, separately identifiable medical service (e.g., managing the patient's blood pressure medication) is performed in addition to the therapy. Add-on codes (90833, 90836, 90838) are used in these instances.

4. Physical Medicine and Rehabilitation

Physical therapy (PT) and occupational therapy (OT) codes (97010-97799) are divided into evaluations, modalities, and therapeutic procedures.

Evaluations

Evaluations are categorized into three levels of complexity: low, moderate, and high. The level is determined by the patient's history, the number of clinical findings, the complexity of clinical decision-making, and the nature of the patient's condition.

Modalities vs. Procedures

• Modalities: Physical agents applied to produce therapeutic changes to biologic tissue (e.g., hot/cold packs, ultrasound therapy, electrical stimulation). Modalities are further divided into supervised (does not require direct patient contact by the provider) and constant attendance (requires direct one-on-one contact).
• Therapeutic Procedures: Manner of effecting change through the application of clinical skills and/or services that attempt to improve function (e.g., therapeutic exercises, manual therapy, gait training). These always require direct one-on-one contact and are generally time-based (billed in 15-minute increments).

5. Non-Invasive Cardiology

This section includes EKGs, echocardiography, and cardiovascular stress tests.

• Electrocardiogram (EKG/ECG): Routine 12-lead EKGs have codes that separate the technical tracing from the physician's interpretation and report. Code 93000 is for the global service, 93005 is for the tracing only, and 93010 is for the interpretation and report.
• Echocardiography: Ultrasound of the heart. Codes distinguish between complete and limited exams, and whether Doppler or color flow mapping is utilized.
• Stress Tests: Like EKGs, cardiovascular stress tests (93350-93351) are broken down into technical and professional components. The codes cover the continuous electrocardiographic monitoring during the exercise or pharmacologic stress.