CHONC Certification

What the CHONC Credential Actually Is

The Certified Hematology and Oncology Coder credential is a specialty certification issued by AAPC, historically the American Academy of Professional Coders. It signals that a coder can translate the documentation of cancer and blood-disorder care into accurate diagnosis codes, procedure codes, drug codes and modifiers, while respecting the payer and compliance rules that shape how oncology practices get paid.

If you are still orienting yourself, our explainers on what CHONC is and what CHONC stands for cover the basics. This article goes deeper on how the certification actually works: the exam mechanics, the content areas AAPC publishes, and how to organize your preparation around them.

One point worth stating plainly: the exam assesses coding from operative and physician-note-based documentation, and CPC or COC is not a prerequisite. This is a specialty credential that stands on its own, which also means the exam expects you to reason from clinical documentation rather than from memorized code lists.

Exam Format, Fees and Registration Mechanics

The live exam is 100 multiple-choice questions delivered in one four-hour sitting. You pass with 70 correct answers, or 70 percent. AAPC does not disclose how many questions are scored versus unscored, and it does not publish a CHONC-specific pass rate. Our page on the CHONC pass rate explains what can and cannot be said responsibly about that, and the CHONC passing score article details the 70 percent threshold.

How the money actually adds up

There is no non-member, exam-only tier. Because active AAPC membership is required, your real entry cost is the exam fee plus membership, and the observed membership add-on is USD 229. Choosing the two-attempt option at USD 399 costs USD 74 more than the single attempt, which is a reasonable hedge if you are sitting the exam without prior oncology billing experience. For the full picture, including books and study materials, see our CHONC certification cost breakdown.

Test center versus remote proctoring

You can test at a Meazure Learning center or through live remote proctoring. Remote sitting comes with live proctoring and equipment requirements, so confirm your computer, camera and room setup well before exam day. Valid ID, membership and examination authorization are all required. Scheduling details are covered in CHONC exam dates and windows.

The 14 Published Competencies, Explained

Here is the part many candidates misread. The current official guide verifies a list of 14 top-level competencies, but AAPC does not publish a numbered weighted blueprint. These competencies are exam-related areas of knowledge, not official weighted domains, and nothing verified tells us which one carries the most questions. Treat any claim of exact percentages per area with suspicion. For a section-by-section walkthrough, see our complete guide to all 14 CHONC content areas.

The competencies, in the order we use for preparation:

1. Medical terminology and anatomy
2. Medical physiology
3. Teaching physician guidelines
4. Incident-to guidelines
5. Split/shared services
6. HIPAA regulations
7. Proper use of the Advance Beneficiary Notice (ABN)
8. CMS drug wastage policy
9. Clinical trial services
10. ICD-10-CM coding
11. E/M code selection using the AMA CPT E/M guidelines
12. CPT coding for common procedures
13. CPT and HCPCS Level II modifier usage
14. HCPCS Level II coding

The foundation pair: terminology, anatomy and physiology

The first two competencies set the vocabulary for everything else. Hematology and oncology documentation is dense with terminology about blood cell lines, marrow, lymphatic structures, solid-organ primaries, metastatic sites and treatment modalities. If you cannot parse a pathology report or a treatment plan, you cannot code it. Physiology matters because coding decisions often hinge on understanding what a condition does, such as why a patient on chemotherapy develops neutropenia or anemia and how that relates to the encounter you are coding.

The Compliance Block: Rules That Decide Billing Outcomes

Competencies three through nine are policy and regulatory topics. They separate oncology coding from general outpatient coding because oncology practices rely heavily on non-physician providers, shared visits, drug administration and trial participation. Expect scenario questions in which the right answer depends on who performed the service and what was documented.

Because the exam draws on official rules rather than payer folklore, answer scenario questions using current CMS and AMA guidance unless the case states a payer-specific assumption. If a question gives you one, apply it; if it does not, do not invent one.

The Coding Block: ICD-10-CM, E/M, CPT and HCPCS

The remaining competencies are the hands-on coding skills. This is where reference-book fluency pays off.

ICD-10-CM coding

Oncology diagnosis coding rewards precision. You need to distinguish primary from secondary malignancies, active disease from history of malignancy, and a neoplasm being treated from one under surveillance. Documentation about laterality, site specificity and encounter purpose drives code selection, and the published table of contents for the study guide points to additional diagnostic detail beyond the competency bullets. Know your guideline conventions for sequencing neoplasm codes and for coding complications and adverse effects of treatment.

E/M code selection using AMA CPT guidelines

Candidates select office and other E/M levels from the documentation using the AMA CPT E/M guidelines, which are based on medical decision making or total time. The exam context allows a provided online E/M calculator, which is different from a prohibited personal calculator, so learn how the tool works before exam day rather than discovering its behavior mid-test. Oncology visits often involve high-risk drug management, which makes the risk element of medical decision making especially worth mastering.

CPT coding for common procedures

The published competency retains five subtopics for common procedures, and they map directly to what you will see in practice:

• 30000 Series: procedures in the respiratory and related ranges that appear in cancer care, such as biopsies and related access procedures
• Laboratory and Pathology: the diagnostic backbone of hematology and oncology, including specimen-based testing and interpretation
• Radiology: imaging used for staging, treatment planning and response assessment
• Medicine: a section that carries much of the infusion, injection and chemotherapy administration coding
• Category III codes: temporary codes for emerging services and technologies, which matter because new oncology techniques often appear here first

Modifiers and HCPCS Level II

Modifier usage spans both CPT and HCPCS Level II, and HCPCS Level II is where drug codes live. Oncology coders spend a large share of their working time on J-codes and related supplies, so questions on matching a drug to the correct code, units and administration pairing are fair game. Modifiers clarify when a service was altered, repeated, bilateral or separately identifiable, and they interact with the wastage policy and the compliance rules above.

Working With Your Code Books on Exam Day

The exam permits approved CPT Professional, ICD-10-CM and HCPCS Level II references under current print and electronic rules. A study guide is not permitted. That distinction shapes how you should prepare your books. Tabbing and organizing approved references is useful; relying on a study guide at the test is not an option.

Because you will have four hours for 100 questions, time is generous on average, but the questions that require a full code lookup, such as a multi-step oncology case, can consume several minutes each. Practice navigating your books quickly. The goal is not to memorize every code but to know where to look and to confirm your selection against guideline text.

Eligibility and What Experience Really Means

The verified requirements are modest on paper: valid ID, active AAPC membership and examination authorization. CPC and COC are not prerequisites, and no mandatory degree, reference letters or training-hour total were verified. Specialty experience is recommended rather than required. Our CHONC requirements guide walks through eligibility in more detail.

Still, the recommendation matters. The exam is described as operative and physician-note-based, and the guide's own sample says hands-on specialty experience matters. If you lack it, compensate by working through real-style documentation, not just rote definitions. Realistic practice on our main practice test site can help you build that case-reading habit.

For a structured look at a first-attempt plan, read our CHONC study guide, and for a candid look at difficulty, see how hard the CHONC exam is.

Sequencing Your Preparation Around the Competencies

Rather than a generic study calendar, order your preparation by dependency: vocabulary first, policy second, code selection last. Here is one way to do it, tied directly to the competencies above.

The reason for this order is simple: policy questions are meaningless without the vocabulary to understand the scenario, and code selection is far faster once you know which billing rules apply. Our CHONC cheat sheet can serve as a quick review during the final week.

Who Hires CHONC Holders and How the Credential Is Maintained

Demand for this skill set comes from places where cancer and blood-disorder care is billed: oncology and hematology practices, hospital outpatient cancer centers, infusion centers, radiation and academic oncology programs, and billing companies that serve these specialties. Browse the kinds of roles in our CHONC jobs overview. On compensation, no verified 2026 CHONC-specific salary premium exists, so we avoid quoting figures; our CHONC salary guide and ROI analysis explain how to weigh the credential honestly.

Keeping the credential current

Maintenance requires an active annual AAPC membership and 36 CEUs per two-year cycle for a single credential. Of those, eight must be hematology/oncology CEUs. If you hold multiple credentials, the totals vary, so check your own requirements. No retirement notice for CHONC was found in the reviewed current issuer sources, and we make no claim about any undisclosed future policy.

Frequently Asked Questions

For a broader introduction, see what CHONC certification is, and when you are ready to test your readiness against realistic questions, try the practice exams at CHONC Exam Prep.