- The Plain Definition: What a CHONC Actually Is
- Who Issues the Credential and How It Is Delivered
- What a CHONC Does All Day
- The 14 Competency Areas Behind the Credential
- Exam Format at a Glance
- Fees, Membership and Eligibility Mechanics
- Who Hires Hematology and Oncology Coders
- Keeping the Credential Active
- Sequencing Your Preparation Around the 14 Areas
- Clearing Up Common Confusion
- Frequently Asked Questions
- CHONC means Certified Hematology and Oncology Coder, an AAPC specialty credential for coders working in cancer and blood-disorder care.
- The exam is 100 multiple-choice questions in four hours; you pass with 70 correct, or 70 percent.
- Active AAPC membership is required to sit the exam, and CPC or COC is not a prerequisite.
- Study material spans 14 competency areas, from terminology and ABN rules to drug wastage, clinical trials and modifiers.
The Plain Definition: What a CHONC Actually Is
A CHONC is a Certified Hematology and Oncology Coder. The credential tells employers that a medical coder can translate the documentation of cancer and blood-disorder care into accurate diagnosis, procedure, drug and evaluation-and-management codes. It is a specialty credential rather than a general entry-level one, which means it is built around the problems that hematology and oncology practices run into every day: infusion services, chemotherapy drugs billed from single-dose vials, clinical trial encounters, and visits shared between physicians and advanced practice providers.
If you have seen the same four letters attached to other credentials elsewhere in healthcare, set those aside. On this site, and throughout this article, CHONC refers only to the AAPC hematology and oncology coding certification. For the shorter versions of this explanation, see What Is CHONC? and What Does CHONC Stand For?.
Who Issues the Credential and How It Is Delivered
The credential comes from AAPC, historically known as the American Academy of Professional Coders. Testing is delivered through Meazure Learning test centers, with remote proctoring available through ProctorU by Meazure Learning. That matters for planning, because the two delivery routes carry different logistics.
- Test center: you travel to a proctored site, present valid ID, and test on the center's equipment.
- Remote proctoring: you test from home or office under live proctoring, which comes with equipment and room requirements you must satisfy before exam day.
Either way, you need a valid ID, an active AAPC membership and your examination authorization. For scheduling windows and deadlines, see CHONC Exam Dates.
What a CHONC Does All Day
The published competency list reads like a job description. A hematology and oncology coder reads provider notes, operative or procedure documentation and orders, then assigns codes that reflect what was performed, why, and under what payer rules. The 2026 study guide sample describes the assessment as based on operative and physician notes, which mirrors real work: you are coding from documentation, not from a menu of answers.
Typical daily tasks include:
- Assigning ICD-10-CM codes for malignancies, secondary sites, blood disorders and treatment-related conditions.
- Selecting E/M levels using the AMA CPT E/M guidelines for oncology office and facility visits.
- Coding common procedures drawn from the CPT 30000 series, laboratory and pathology, radiology, medicine and Category III codes.
- Applying HCPCS Level II codes for drugs and supplies, and handling CMS drug wastage documentation.
- Choosing the right CPT and HCPCS Level II modifiers so claims reflect what actually happened.
- Flagging billing-compliance issues such as incident-to eligibility, split/shared services, teaching physician rules and ABN use.
The 14 Competency Areas Behind the Credential
The 14 preparation categories used on this site come from the top-level competency bullets in the AAPC CHONC Study Guide sample (printed page 2). They are published, exam-related competencies, not official weighted exam domains, and the sample itself says the guide is not comprehensive. Treat them as the best public map of what you need to know. A full walkthrough lives in CHONC Exam Domains 2026: Complete Guide to All 14 Content Areas.
Foundations: Terminology, Anatomy and Physiology
Domain 1 (medical terminology and anatomy) and Domain 2 (medical physiology) underpin everything else. Oncology notes are dense with staging language, tumor sites, laterality and treatment terminology.
- Know how cancers are described by site, behavior and spread.
- Understand blood-cell physiology well enough to follow hematology diagnoses.
- Recognize the vocabulary of chemotherapy, radiation and supportive care.
Compliance and Billing Rules
Domains 3 through 9 cover the rules that determine who can bill, how, and under what circumstances: teaching physician guidelines, incident-to guidelines, split/shared services, HIPAA regulations, proper use of the Advance Beneficiary Notice (ABN), CMS drug wastage policy and clinical trial services.
- Incident-to and split/shared rules matter because oncology visits often involve both physicians and advanced practice providers.
- Drug wastage policy matters because chemotherapy is frequently supplied in vials larger than the dose given.
- Clinical trial services require separating routine care from research-related care.
Code Sets and Modifiers
Domains 10 through 14 are the coding core: ICD-10-CM coding, E/M code selection using the AMA CPT E/M guidelines, CPT coding for common procedures, CPT and HCPCS Level II modifier usage, and HCPCS Level II coding.
- The common-procedure area spans the 30000 series, laboratory and pathology, radiology, medicine and Category III codes.
- Modifiers are where documentation meets payment, so expect scenario-based reasoning.
- HCPCS Level II is central to drug and supply reporting.
| Grouping | Competency Areas | What You Practice |
|---|---|---|
| Foundations | Medical terminology and anatomy; medical physiology | Reading and interpreting oncology and hematology documentation |
| Rules and compliance | Teaching physician; incident-to; split/shared; HIPAA; ABN; drug wastage; clinical trials | Deciding who can bill, what is billable and what must be documented |
| Coding skills | ICD-10-CM; E/M; CPT procedures; modifiers; HCPCS Level II | Assigning accurate codes from provider notes |
Exam Format at a Glance
The live examination consists of 100 multiple-choice questions administered in a single four-hour sitting. You pass by answering 70 correctly, which is 70 percent. AAPC does not publish how many questions are scored versus unscored, and it has not published a CHONC-specific pass rate, so any figure you see quoted for that should be treated with suspicion. The practical point is simple: 70 correct is the number to plan around. The details are collected on CHONC Passing Score 2026, and CHONC Pass Rate 2026: What the Data Shows explains what is and is not known.
Because the exam is scenario-driven and note-based, expect questions that hand you documentation and ask for the right code, the right modifier, or the right compliance decision. Four hours for 100 questions gives you room to look things up, which brings us to references.
Do not confuse the live exam with practice products. The 35-question exercise in the study guide and any 50-question practice set are study tools, not the exam's actual length. For difficulty context, read How Hard Is the CHONC Exam?.
Fees, Membership and Eligibility Mechanics
Two features shape your budget and your timeline: the exam fee and the membership requirement.
| Item | What the Verified Facts Say |
|---|---|
| Exam with one attempt | USD 325 |
| Exam with two attempts | USD 399 |
| AAPC membership | Required; no non-member exam-only tier. Observed membership add-on: USD 229 |
| Prerequisite credentials | CPC or COC not required |
| Experience | Specialty experience recommended; no mandatory degree, references or training-hour total verified |
The membership requirement is the part candidates most often overlook. There is no way to buy the exam alone without active membership, so budget for both. The two-attempt option costs less than buying a second single attempt would, which makes it worth weighing if you expect to need a retake. A full breakdown, including study materials, appears in CHONC Certification Cost 2026, and eligibility specifics are in CHONC Requirements 2026.
Key Takeaway
Not holding a CPC or COC does not block you, but the study guide sample stresses that hands-on specialty experience matters. If you have never coded oncology encounters, build exposure to real notes before you rely on a guide alone.
Who Hires Hematology and Oncology Coders
Demand for this credential comes from settings where cancer and blood-disorder care is billed at volume. Common employers include:
- Independent oncology and hematology practices, where in-office infusion, drug billing and E/M coding sit side by side.
- Hospital outpatient cancer centers and health-system oncology service lines.
- Radiation oncology and infusion-focused groups that need accurate procedure and drug reporting.
- Billing companies and coding vendors serving oncology clients.
- Research-oriented programs that bill clinical trial services and must separate research from routine care.
Browse role types on CHONC Jobs. On compensation, note that no verified 2026 CHONC-specific salary premium exists, so be cautious about any article promising one. The honest framing is in CHONC Salary Guide 2026 and the return-on-investment discussion in Is the CHONC Certification Worth It?.
Keeping the Credential Active
Passing the exam is not the end of the commitment. To keep a single credential active you maintain annual AAPC membership and complete 36 CEUs per two-year cycle, including eight hematology/oncology CEUs. If you hold multiple AAPC credentials, the totals vary, so check your own cycle rather than adding numbers together. The eight specialty CEUs are a useful reminder that the credential is meant to reflect ongoing oncology knowledge, not a one-time snapshot.
Sequencing Your Preparation Around the 14 Areas
Since there is no official numbered weighted blueprint, and the largest domain is unknown, do not over-invest in any one area on the basis of guesses. A sensible order moves from vocabulary to rules to code assignment, because each layer depends on the one before. This is an illustrative plan, not an official schedule.
Foundations
- Terminology, anatomy and physiology (Domains 1 and 2), focusing on cancer sites and blood disorders.
- Reason: every later question assumes you can read the note.
Compliance rules
- Teaching physician, incident-to, split/shared, HIPAA and ABN (Domains 3-7).
- Drug wastage and clinical trial services (Domains 8-9), which are oncology-heavy.
Code sets
- ICD-10-CM, then E/M selection under AMA CPT guidelines (Domains 10-11).
- CPT common procedures and modifiers (Domains 12-13), then HCPCS Level II (Domain 14).
Integration
- Timed, note-based scenarios using your approved reference books.
- Review weak areas rather than re-reading strong ones.
Tab and annotate your CPT, ICD-10-CM and HCPCS Level II books in line with the current rules, and practice looking things up quickly, since the exam gives you four hours but rewards efficient navigation. For a deeper plan, see the CHONC Study Guide 2026 and the one-page CHONC Cheat Sheet. To test yourself against scenario-style questions, use the CHONC practice tests and our full question bank. Practice-question coverage on this site is editorially allocated, and structural domain counts there do not establish official exam weights.
Clearing Up Common Confusion
- Not the same as CPC or COC. Those are separate AAPC credentials, and neither is a prerequisite for CHONC.
- The study guide is not the exam. The sample is explicitly non-comprehensive, and the paid guide is a study aid you cannot bring into the exam.
- Competency lists are not weights. The 14 areas are published competencies, not a weighted blueprint.
- Payer rules depend on the case. Apply current official ICD-10-CM, CPT, HCPCS and regulatory guidance, and assume payer-specific rules only when a question states them.
For related explainers, see CHONC Meaning, What Is CHONC Certification? and the overview at CHONC Certification. If you are weighing training routes, CHONC Training covers the options.
Frequently Asked Questions
CHONC stands for Certified Hematology and Oncology Coder, a specialty coding credential offered by AAPC for coders working with cancer and blood-disorder services.
The exam has 100 multiple-choice questions in a four-hour sitting. You pass with 70 correct answers, or 70 percent. The split between scored and unscored questions is not disclosed.
No. CPC and COC are not prerequisites. You do need active AAPC membership, a valid ID and examination authorization, and specialty experience is recommended.
The exam is USD 325 for one attempt or USD 399 for two attempts. Active AAPC membership is also required, with an observed membership add-on of USD 229.
Approved CPT Professional, ICD-10-CM and HCPCS Level II references are allowed under current print and electronic rules. Study guides and personal calculators are not allowed, and live proctoring and equipment requirements apply.