Oncology CPT Codes

Medical billing and claim management for cancer care is not simple. A single patient visit can involve an office visit, a scan, a biopsy, a chemotherapy infusion, and a lab test, all on the same day. Each of these needs its own correct Oncology CPT codes. If the code is incorrect, missing, or outdated, the claim is denied, and payment is delayed.

2026 brings some of the biggest coding changes oncology has seen in years, especially in radiation therapy and genetic testing.

This article lists the most important 2026 oncology CPT codes.

Office and Outpatient Evaluation CPT Codes

These CPT codes are used when a cancer patient is seen for a consultation, follow-up, or treatment planning visit. The CPT code depends on whether the patient is new to the practice or already known to it, and on how much time or medical decision-making the visit requires.

Rules and exceptions:

• Choose the visit level using either total time spent on the date of the visit or the level of medical decision-making, not both.
• If an E/M visit happens on the same day as a chemotherapy infusion, add modifier 25 to the E/M code to show it was a separate, identifiable service.
• Many payers no longer recognize outpatient consultation codes (99241–99245); check the specific payer policy before billing them.
• Medicare does not require a different diagnosis code to bill an E/M visit alongside chemotherapy on the same day.

Chemotherapy and Antineoplastic Drug Administration CPT Codes

Chemotherapy and antineoplastic drug administration CPT codes describe how a chemotherapy or other complex cancer drug is given to the patient, e.g., by injection, IV push, or IV infusion. The correct CPT code depends on the route used and how long the infusion lasts, not on which drug is given.

Rules and exceptions:

• 96413 needs at least 16 minutes of documented infusion time to be billed at all; the clock starts and stops with the actual infusion, not the time the patient sits in the chair.
• Only one “initial” code can be billed per visit. If several drugs are given, the main reason for the visit is the initial code, and the rest are billed as sequential or concurrent add-on codes.
• Anti-nausea drugs and other supportive medications are not chemotherapy administration; even when given during a chemo visit, they use different codes.
• If a drug is given first by IV push and then switched to an infusion, code both, following the correct hierarchy for initial versus sequential service.

Non-Chemotherapy Infusion and Supportive Care CPT Codes

Cancer patients often receive fluids, antibiotics, or anti-nausea medicine alongside chemotherapy.
These “non-chemo” infusion codes are billed separately, even on the same visit.

​Rules and exceptions for using Non-chemotherapy infusion and supportive care CPT codes:

• Anti-anemia and anti-nausea drugs given by injection for a cancer patient are billed with these codes, not chemotherapy codes.
• Hydration codes cannot be billed if the fluid is only used to run or flush a chemotherapy drug — it must be a medically necessary, separately ordered hydration service.

Radiation Therapy Delivery CPT Codes (with Major Changes in 2026)

2026 brought the biggest change to radiation therapy coding in over a decade. The old CPT codes that separated simple, intermediate, and complex delivery, and the codes for 3D versus IMRT, have all been replaced with three simple complexity levels.

Rules and exceptions:

• CPT codes 77385, 77386 (old IMRT delivery codes), and 77014 (CT guidance) were deleted starting January 1, 2026. Claims using these codes will not be paid for dates of service in 2026.
• The technical part of image guidance is now bundled into 77402, 77407, and 77412, so it can no longer be billed as a separate line item.
• Only the professional interpretation of image guidance is billed separately, using 77387.
• The code level (1, 2, or 3) is chosen based on the complexity of the delivery technique, not simply whether the treatment was 3D or IMRT.

Radiation Therapy Planning and Management CPT Codes

Before radiation is delivered, the team plans the treatment, calculates doses, and regularly checks the plan. These codes cover planning and ongoing management work.

Rules and exceptions:

• Treatment management code 77427 is billed once for every 5 fractions delivered, regardless of how many days that takes.
• Planning and simulation codes are billed only once per treatment course, not repeated for every session.
• Dosimetry and physics codes should match what the department’s physics team actually documents; a plan and a dosimetry calculation are two separate services.

Diagnostic Imaging CPT Codes Used in Oncology

Imaging is used to find, stage, and monitor cancer. These are the scans oncology providers order and bill most often.

Rules and exceptions:

• PET/CT codes should be chosen based on the actual body area scanned; 78815 covers only the base of the skull to the mid-thigh, which is where most cancers and lymph nodes are found.
• Imaging with and without contrast is a different code than imaging with contrast only — match the code to what was actually documented in the radiology report.
• Many payers require prior authorization for PET/CT and MRI in cancer staging; check payer rules before scheduling.

Biopsy and Tissue Sampling CPT Codes

Before starting treatment, a tissue or fluid sample usually needs to be collected and examined. These codes cover the collection procedure itself.

Rules and exceptions:

• If bone marrow aspiration and biopsy are both done in the same session through the same skin entry point, bill the combined code 38222, not both 38220 and 38221 separately.
• Imaging guidance codes (like ultrasound or CT guidance) can be billed in addition to the biopsy code, but only if the guidance is medically necessary and separately documented.
• The biopsy collection code is billed by the provider performing the procedure; the tissue examination itself is billed separately by pathology.

Pathology CPT Codes for Cancer Diagnosis

Once a tissue sample is collected, a pathologist examines it to confirm whether cancer is present. This is billed separately from the biopsy collection.

Rules and exceptions:

• Pathology codes are billed per specimen. If three separate tissue samples arrive in three separate containers, the code is billed three times.
• The level (such as 88305 vs. 88307) depends on the type of tissue and the difficulty of the exam, not on how long it took.
• Both a “gross” (visual) and a “microscopic” review must be documented to bill these codes.

Genomic and Molecular Testing CPT Codes (New for 2026)

Precision oncology depends on genetic testing to guide treatment choices. 2026 introduced major new codes in this area, especially for advanced tumor profiling.

Rules and exceptions:

• Code 81354 is new for 2026 and covers optical genome mapping, a newer lab technique that detects chromosome changes with more detail than older methods.
• Code 81524 is also new for 2026 and is specific to brain tumors — it reports the probability that a tumor matches a known tumor type, based on methylation patterns.
• Reports for these tests must document the tumor type, the gene or marker tested, the method used, and how the result affects treatment planning — payers often audit this documentation closely.
• Many genomic panels also have their own Proprietary Laboratory Analysis (PLA) codes, which are lab-specific and updated throughout the year, not just every January.

Telemedicine CPT Codes for Oncology Visits in 2026

2026 added new codes to better capture virtual cancer care visits, replacing the older telephone-only codes.

Rules and exceptions:

• Codes 99441–99443 (audio-only telephone visits) are no longer used starting in 2026; use the new 98008–98015 series instead.
• Standard in-person E/M codes (99202–99205, 99212–99215) remain valid and are not replaced by telemedicine codes — they apply only to in-person visits.
• Payer coverage for audio-only visits varies, so confirm coverage before billing, especially for Medicare Advantage and commercial plans.

Modifiers Used in Oncology Billing

Sometimes, healthcare providers misuse modifiers with cancer treatment CPT codes and lose hundreds of dollars. Here are some common modifiers that are used with oncology CPT codes:

Modifier 25

Modifier 25 is used on an E/M code when a significant, separately identifiable visit happens on the same day as a procedure like chemotherapy administration.

Modifier JW

Modifier JW is used to report the amount of a drug that was wasted or discarded, not given to the patient.

Modifier JZ

Modifier JZ is required for drug claims when there is zero waste. It means the entire vial or dose was given to the patient.

Modifier 59 (or the more specific X modifiers)

Modifier 59 is used to show that two procedures billed on the same day were distinct and separate from one another.

Here are some common billing errors that healthcare providers often commits:

Missing infusion start and stop times

Chemotherapy infusion codes are time-based. Without a documented start and stop time, the correct code level cannot be chosen, and the claim may be denied or downcoded.

Confusing chemotherapy and non-chemotherapy drugs

Not every drug given during a cancer treatment visit counts as “chemotherapy” for coding purposes.

Billing outdated radiation codes

As explained above, several older radiation codes were deleted for 2026. Continuing to use them after January 1, 2026, will result in claims being denied.

Leaving off the JW or JZ modifier

Since these modifiers became mandatory for reporting drug waste (or the absence of waste), missing them is now a frequent and preventable denial reason.

Under-documenting genomic test reports

Payers closely review new genomic codes such as 81354 and 81524. The lab report must clearly state what was tested, the method used, and how the result guides treatment — general or vague reports are a common audit trigger.

Staying Current With Yearly Code Changes

CPT codes are updated every year by the American Medical Association, with most changes taking effect on January 1. For oncology practices, the safest approach is to:

• Review the AMA’s official yearly CPT changes before the new year begins.
• Update the practice’s charge master and billing software with new, revised, and deleted codes.
• Train front-desk, clinical, and billing staff on any changed documentation requirements, especially for time-based and genomic testing codes.
• Confirm which prior authorizations carry over and which need to be resubmitted under new codes.

Final Thoughts

Oncology billing touches almost every part of the CPT code set i.e. office visits, drug administration, imaging, pathology, genomic testing, and radiation therapy. The 2026 changes, especially the radiation therapy overhaul and the new genomic testing codes, make it more important than ever for practices to keep their coding systems up to date. 

Note: CPT codes and guidelines are updated periodically by the AMA and CMS. Always confirm the current codes and payer-specific rules before billing.