4.3 Prolonged Services & Preventive E/M

Prolonged Services & Preventive E/M

Quick Answer: Preventive E/M codes are age-based and cover routine check-ups. Prolonged service codes capture time spent beyond the maximum limit of a level 5 E/M visit. Determining if a patient is 'new' or 'established' depends entirely on the strict 3-year rule.

While the standard office visit codes (99202-99215) account for the bulk of E/M coding, the CPT manual contains specific sections for specialized encounters. Understanding how to apply preventive medicine codes, prolonged service add-ons, and split/shared billing rules is heavily tested on the CCS-P exam.

The 'New' vs. 'Established' Patient Rule (The 3-Year Rule)

One of the most foundational concepts in E/M coding is distinguishing between a new patient and an established patient. This distinction directly dictates which code set you can use.

• New Patient: An individual who has not received any professional services (E/M or other face-to-face services) from the physician/qualified healthcare professional, or another physician of the exact same specialty and subspecialty who belongs to the same group practice, within the past exactly 3 years.
• Established Patient: An individual who has received professional services from the physician or a physician of the exact same specialty/subspecialty in the same group practice within the past 3 years.

Nuance: If a patient sees a cardiologist in Group A, and two years later sees an endocrinologist in Group A, the patient is considered a New Patient to the endocrinologist because the specialties are different, despite being in the same group practice.

Preventive Medicine Services (99381 - 99397)

Preventive medicine codes are used to report the routine evaluation and management of adults and children when there is no active illness or injury being treated. These are your standard "annual physicals" or "well-child checks."

Unlike standard E/M codes, preventive medicine codes are not selected based on MDM or time. Instead, they are selected based on two factors:

1. Patient Status: New patient (99381-99387) vs. Established patient (99391-99397).
2. Patient Age: The codes are broken down by age brackets (e.g., under 1 year, 1-4 years, 5-11 years, 12-17 years, 18-39 years, 40-64 years, 65 years and over).

A preventive medicine service includes an age and gender-appropriate history/exam, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of appropriate immunizations or laboratory tests.

Billing a Problem-Oriented E/M with a Preventive Exam

Often, a patient presents for a routine physical but brings up a specific, significant problem (e.g., "While I'm here for my physical, my knee has been causing me severe pain for three weeks").

If the problem requires significant, additional work to evaluate and manage, the coder should report:

• The appropriate Preventive Medicine code.
• The appropriate Office/Outpatient E/M code (e.g., 99213) with Modifier 25 appended.

The documentation must clearly show the distinct work performed for the problem-oriented visit separate from the routine preventive exam.

Prolonged Services

Sometimes, an encounter takes far longer than the time allotted for the highest-level E/M code. In these cases, prolonged service add-on codes are used.

Under the current guidelines, prolonged services (like CPT 99417 or HCPCS G2212 for Medicare) can only be billed when:

1. The base E/M code was selected using Total Time (not MDM).
2. The base E/M code is the highest level in the category (e.g., 99205 or 99215).
3. The total time exceeds the maximum time threshold of that level 5 code by a specific increment (typically 15 minutes).

Note on Payer Differences: The AMA (CPT) and CMS (Medicare) have different rules for exactly when the 15-minute prolonged service clock starts. The AMA says it starts at the minimum time of the highest code, while CMS insists it starts only after the maximum time of the highest code has been exceeded. Because of this, Medicare created its own HCPCS code (G2212) to be used instead of CPT 99417.

Split or Shared E/M Visits

A split (or shared) visit is an E/M encounter in a facility setting (hospital, emergency department) that is performed jointly by a physician and a Non-Physician Practitioner (NPP), such as a Nurse Practitioner (NP) or Physician Assistant (PA), who are in the same group.

The critical question for billing is: Whose NPI do you use to bill the service?

Under recent CMS rules, the visit is billed under the provider who performed the substantive portion of the visit. The substantive portion can be determined by:

1. Time: Whoever spent more than half of the total combined time.
2. Medical Decision Making: Whoever performed the MDM for the encounter.

If the NPP performed the substantive portion, the claim is billed under the NPP, which typically results in reimbursement at 85% of the physician fee schedule. If the physician performed the substantive portion, it is billed under the physician for 100% reimbursement.