CPT Code 36591: Collection of Blood Specimen from a Completely Implantable Venous Access Device

CPT code 36591 covers blood specimen collection from a completely implantable venous access device; billed only if no other services are reported.

Use Code

What is CPT code 36591?

CPT code 36591 is a procedural billing code that refers specifically to the collection of a blood specimen from a completely implantable venous access device, such as a Port-a-Cath or Mediport. These venous access devices are implanted beneath the skin and are commonly used in patients who require frequent blood draws or long-term intravenous therapy, such as chemotherapy or parenteral nutrition.

The key distinction with CPT code 36591 is that it applies only to blood draw procedures from fully implantable devices—not from external lines like central venous catheter types such as peripherally inserted central catheter (PICCs) or tunneled catheters (which are instead coded as CPT code 36592). It is important to note that CPT code 36591 is tightly restricted when it comes to billing. According to Medicare physician fee schedule guidelines, this code is typically reimbursed only when it is the sole procedure provided on a given date. If any other service or payable evaluation and management service is submitted on the same day by the same provider, 36591 becomes bundled and is not reimbursed separately.

Due to these restrictions, healthcare providers should carefully document and report this procedure only when appropriate. Misuse—such as billing for 36591 alongside office visits, evaluation, or additional services—can lead to claim denials.

CPT code 36591 documentation requirements

Accurate and detailed documentation is essential when reporting CPT code 36591, which covers collection of blood specimen from a completely implantable venous access device. To ensure compliance and avoid claim denials, providers must include several key elements in the patient’s medical record.

Procedure identification: Clearly state that the blood draw was performed from a completely implantable venous access device (e.g., Port-a-Cath, Mediport), a type of established central line.
Device specificity: Do not use this CPT code for blood specimens drawn from central venous catheter types like PICCs or external lines—use CPT code 36592 instead.
Order or intent to test: Include a specific physician order or detailed clinical note indicating the laboratory service or tests requested. Vague notes like “run labs” are insufficient.
Solo billing requirement: Ensure no other service or payable evaluation and management e-codes are billed on the same date; CPT Code 36591 must be the only non-laboratory service submitted.
No modifiers allowed: Do not append modifiers (e.g., 59, 90) to bypass bundling restrictions—these are considered inappropriate for this CPT code.
Supporting clinical notes: Include physician progress or office notes justifying the need for collection of blood specimen via the implantable venous access device and documenting medical necessity.

CPT code 36591 billing guidelines

When billing CPT Code 36591, providers must follow strict guidelines to ensure appropriate reimbursement and avoid claim denials. Below are the key billing considerations:

Single-service reimbursement: CPT 36591 is reimbursed only if it is the sole non-laboratory service billed by the provider on the same date of service.
No other non-lab services allowed: Do not bill 36591 with other procedures or evaluation and management (E/M) services—doing so will result in bundling or denial.
CMS status indicator: Designated as a status T or Q1 code—it has a payment value but is bundled if any other service is billed by the same provider on the same date.
No use of modifiers: Do not append modifiers (e.g., 59, 90) to try to separate 36591 from other billed services; such attempts are not allowed under CMS or payer rules.
Not interchangeable with CPT 36592: Use 36591 only for completely implantable devices (e.g., Port-a-Cath). For PICCs or Hickman catheters, use CPT 36592 instead.
Hospital outpatient settings: In outpatient hospital billing, 36591 is a “special packaged” code and reimbursed only if it's the only service performed that day.

Other relevant CPT codes

36592 – Collection of blood specimen using established peripheral venous access device
36415 – Routine venipuncture for lab specimen
36533 - Insertion of the implantable venous access device itself.

Frequently asked questions

No. CPT 36591 is bundled with evaluation and management e codes and most therapeutic services during the same encounter. No separate payment is allowed.

No. 36591 is strictly for collection of blood specimen using an established central venous access device, not for flushing.

Only healthcare providers furnishing direct patient care. Independent labs cannot report this CPT code on their own.