Multiple procedures in the same surgery: how to calculate

When a patient undergoes two or more surgical procedures in the same act, the charge to the health plan is not simply the sum of the values of each procedure.

The Brazilian Hierarchical Classification of Medical Procedures (CBHPM) defines specific rules for this type of situation, with payment percentages according to the relationship between the procedures performed.

For hospital billing and audit teams, mastering these rules is essential. Errors in applying the percentages result in incorrect charges, denials and lost revenue.

What the CBHPM sets out for multiple procedures

The CBHPM is the reference table for physician fees in Brazil’s private healthcare system, adopted as the minimum ethical standard by CFM (Federal Council of Medicine) Resolution No. 1,673/2003, which sets mandatory criteria for health plans’ payment of medical procedures.

Item 4 of the CBHPM General Instructions deals specifically with the valuation of multiple surgical procedures performed in the same act. The central rule is: when there is more than one procedure, the one with the highest tier (porte) is paid in full, and the others receive reduced percentages. These percentages vary according to the access route used, whether the surgery is bilateral and how the teams are made up.

The logic behind this rule is technical: procedures performed through the same incision share part of the surgical effort, the exposure of the field and the anesthetic risk. That is why the additional payment is proportional to the incremental effort, not to the full value of each procedure on its own.

Same access route: main and secondary procedures

When two or more procedures are performed through the same access route, whether the same incision, the same cavity or the same anatomical approach, the following scale applies:

• Main procedure (highest tier): 100%.

• Additional procedures: 50% of the tier value of each one.

This rule applies both to procedures planned in advance and to those indicated during the surgical act itself, as long as they are performed through the same route.

How to calculate in practice

The procedure with the highest tier is identified and billed in full. The others are ranked from largest to smallest and paid at 50% each. When there is a specific code that already covers the set of procedures performed, only that code is used, without adding up the individual values.

Examples by specialty

Orthopedics: knee arthroscopy with meniscectomy and ACL reconstruction through the same route. The arthroscopy with meniscectomy is the main procedure, billed at 100%. The ACL reconstruction, performed through the same access, is billed at 50%.

Obstetrics: cesarean section with tubal ligation. Both procedures use the opening of the abdominal cavity as the access route. The cesarean section is the main procedure (100%) and the tubal ligation is billed at 50%.

Vascular: color Doppler of the lower limbs performed bilaterally in the same session, with access through the same segment. The limb with greater complexity is billed at 100%; the contralateral limb, at 50%.

Different access routes: when to bill more

When the procedures are performed in distinct anatomical regions, requiring separate accesses, the percentage applied to the additional procedures is higher. In this case:

• Main procedure (highest tier): 100%.

• Additional procedures through a different route: 70% of the tier value of each one.

The technical justification is that each distinct access route represents an independent surgical effort. Opening a second surgical field requires additional preparation, instrumentation and exposure, which justifies higher payment than for the same route.

How to calculate in practice

The procedure with the highest tier is billed at 100%. The others, performed through different routes, are billed at 70% each. The distinction between routes must be clear in the surgical description to support the charge and avoid denials.

Examples by specialty

Dermatology: removal of one lesion on the face and another on the arm in the same surgery. These are distinct routes. The larger removal is billed at 100%; the second, at 70%.

Plastic surgery: abdominoplasty and mammoplasty performed in the same act. The incisions are independent. The abdominoplasty is billed at 100%; the mammoplasty, at 70%.

Summary: percentages by type of access route

Bilateral surgeries: how symmetry changes the calculation

Bilateral procedures, performed on both sides of the body, follow their own logic within the CBHPM General Instructions:

• Bilateral with different incisions (two separate accesses): 70% is added to the tier value of the main surgery.

• Bilateral with the same incision: 50% is added to the tier value of the main surgery.

In this case, documentation of the surgical route is decisive for correct valuation. A report that describes two distinct incisions on contralateral limbs supports the 70% charge; without that description, the payer’s audit may reduce it to 50%.

Different teams: full payment

When two or more procedures are performed simultaneously by different medical teams, each team is paid in full for the procedure it performed. In this case, the 50% or 70% reducers do not apply.

For this rule to hold in billing, the hospital claim must clearly identify the teams involved and the procedures performed by each. Without that distinction, the payer may apply the reducers as if it were a single team.

Integrated procedures: bill only the main act

When one surgical act is an integral part of another, the CBHPM requires that only the main procedure be valued, without adding the complementary one.

Example: hemostasis performed as part of a larger procedure is not billed separately. The tier value of the main procedure already includes that step.

Billing integrated procedures separately is one of the frequent causes of technical denials in payer audits. The billing team should review the surgical description and identify whether any of the procedures listed is, in practice, a step of the main one.

Doppler of the lower limbs: how to calculate

When billing a Doppler of the lower limbs, should both limbs be entered on the same form or through separate routes?

The answer depends on how the exam was performed.If the Doppler was done on both limbs through the same approach and in the same session, it is a bilateral surgery. In this case, the limb with greater complexity is billed at 100% and the contralateral limb at 50% (same incision) or 70% (distinct accesses), according to the description in the report.

If the two limbs were assessed as independent procedures, with separate reports and distinct clinical indications, the payer may accept full charges for each one. But this situation requires robust clinical documentation and, in many cases, specific prior authorization.

The practical rule: check the contract with the payer and see whether there is a specific provision on bilateral exams. In the absence of a contract, the CBHPM is the benchmark.

Impact on hospital billing and denials

Incorrect application of the percentages for multiple procedures is a recurring source of technical denials in hospitals. Two errors are the most common:

• Billing all procedures at 100%, ignoring the CBHPM reducers. The payer denies the excess amounts.

• Applying the wrong reducers by confusing access routes. A procedure through a different route billed at 50% instead of 70% means lost revenue for the hospital.

In both cases, the problem originates in the surgical documentation. The description of the access route, the identification of the teams and the distinction between independent and integrated procedures are the elements that support or invalidate the charge.

The internal audit department should review claims with multiple procedures before submission, checking whether the percentages applied match what is described in the medical record and in the surgical report. This review is more efficient when done systematically, by type of procedure and by specialty, making it possible to identify error patterns and correct them before they become recurring denials.

Technology helps avoid denials

Billing for multiple procedures accounts for a significant share of technical denials for incorrect billing in Brazilian hospitals. Most of these losses originate at the internal audit stage: the claim goes out without anyone having cross-checked the surgical description against the percentages applied.

Automating this cross-check, by reading the medical record and validating it against the CBHPM rules and each payer’s contracts, is what turns auditing from a manual, error-prone process into a systematic, reliable step. The result is fewer denials, more revenue and less rework for billing teams.

Rivio was founded to transform hospital management through artificial intelligence. In a landscape under growing pressure from costs, regulatory complexity and operational inefficiencies, we believe technology is the way to bring financial predictability, scale and intelligence back to healthcare’s administrative processes.

Frequently asked questions about multiple procedures in the same surgery

What percentage applies to the second procedure through the same access route?

50% of the tier value. The procedure with the highest tier is paid at 100%, and the others performed through the same route receive 50% each.

What if the procedures are performed through different access routes?

The percentage rises to 70% for the additional procedures. A distinct access route represents an independent surgical effort, which justifies the higher payment.

How do you bill a bilateral Doppler of the lower limbs?

It depends on the description in the report. If both limbs were assessed through the same approach in the same session, the bilateral rule applies: 100% for the main limb and 50% or 70% for the contralateral one, depending on the route. Also check the contract with the payer.

When does no reducer apply to multiple procedures?

When the procedures are performed by different teams. In this case, each team is paid in full for the procedure it performed, with no reducing percentages applied.

What is an integrated procedure?

It is a procedure that is a technical step of a larger one. The CBHPM states that, in this case, only the main act is valued. Billing the two separately is a frequent cause of technical denials.