You’ve completed your medical coding course, updated your resume, and finally received the interview call. Then the interviewer asks: “What is medical coding?”

Suddenly, all those codes you studied don’t seem quite as easy as they did in class.

Don’t worry. Medical coding interviews for freshers are usually less about memorizing hundreds of codes and more about checking whether you understand medical terminology, anatomy, coding guidelines, ICD-10-CM, CPT, HCPCS, and basic coding concepts.

If you’re preparing for your first medical coding job in 2026, knowing the questions interviewers commonly ask can help you walk into the interview with much more confidence.

Below are 25 important medical coding interview questions and answers for freshers.

1. What is Medical Coding?

Answer:
Medical coding is the process of converting information from healthcare documentation into standardized medical codes. These codes represent diagnoses, procedures, services, and other healthcare information.

Common coding systems include ICD-10-CM, CPT, and HCPCS Level II.

2. What Is the Difference Between Medical Coding and Medical Billing?

Answer:
Medical coding focuses on reviewing medical documentation and assigning appropriate diagnosis and procedure codes.

Medical billing focuses more on using that coded information to prepare and submit claims, follow up on payments, manage denials, and support reimbursement.

In simple terms:

Coding = Documentation → Codes

Billing = Codes → Claims → Reimbursement

Both functions work together within the healthcare revenue cycle.

3. What Is ICD-10-CM?

Answer:
ICD-10-CM stands for International Classification of Diseases, 10th Revision, Clinical Modification.

It is used primarily to report diagnoses and health conditions in healthcare settings.

A coder uses the documentation and applicable coding guidelines to select the appropriate ICD-10-CM code.

4. What Is CPT?

Answer:
CPT stands for Current Procedural Terminology.

CPT codes are used to report many medical procedures, services, and professional healthcare services.

CPT codes are maintained by the American Medical Association (AMA).

5. What Is HCPCS?

Answer:
HCPCS stands for Healthcare Common Procedure Coding System.

HCPCS Level II codes are commonly used to report various products, supplies, services, and items that aren’t represented by CPT codes.

For example, certain medical supplies, ambulance services, and durable medical equipment may be reported using HCPCS Level II codes.

6. What Is the Difference Between ICD-10-CM and CPT?

Answer:

ICD-10-CM primarily represents diagnoses and conditions.

CPT primarily represents procedures and professional services.

For example, a patient’s diagnosis may be represented using an ICD-10-CM code, while a procedure performed during the encounter may be reported using a CPT code.

7. What Is Medical Necessity?

Answer:
Medical necessity generally means that a healthcare service or procedure is appropriate and supported by the patient’s condition and clinical circumstances.

In coding and billing, documentation and payer requirements help determine whether the reported service is supported.

A coder should never assume medical necessity without appropriate documentation and applicable guidelines.

8. What Is a Modifier?

Answer:
A modifier is used with certain procedure codes to provide additional information about how, where, or under what circumstances a service was performed.

Modifiers can provide important details without changing the basic procedure code itself.

Examples include Modifier 25 and Modifier 59, although their use depends on specific coding circumstances.

9. What Is Modifier 25?

Answer:
Modifier 25 is used to indicate that a significant, separately identifiable evaluation and management service was performed by the same physician or other qualified healthcare professional on the same day as another procedure or service, when the documentation supports its use.

A common interview follow-up is:

“Can Modifier 25 be used simply because two services were performed on the same day?”

The answer is no. The documentation must support the requirements for separately reporting the E/M service.

10. What Is Modifier 59?

Answer:
Modifier 59 is used to indicate that a procedure or service was distinct or independent from another service performed on the same day.

It may be appropriate in circumstances involving factors such as a different encounter, procedure, site, organ system, or other qualifying circumstances, depending on the coding rules.

It should not be added automatically just to bypass a code-edit issue.

11. What Is a Principal Diagnosis?

Answer:
For inpatient coding, the principal diagnosis is generally the condition established after study to be chiefly responsible for the admission of the patient to the hospital.

The exact determination must follow the applicable official coding guidelines.

For outpatient coding, the terminology and sequencing rules are different, so a coder should understand the distinction.

12. What Is a First-Listed Diagnosis?

Answer:
In many outpatient settings, the first-listed diagnosis is generally the diagnosis, condition, problem, or other reason chiefly responsible for the services provided during the encounter.

The correct selection depends on the documentation and the applicable outpatient coding guidelines.

13. What Is Upcoding?

Answer:
Upcoding occurs when a healthcare service or condition is reported using a code that represents a higher level or greater severity than what is supported by the documentation.

For example, reporting a higher-level service without documentation to support that level can be considered upcoding.

Accurate coding requires following documentation and coding guidelines rather than trying to increase reimbursement.

14. What Is Downcoding?

Answer:
Downcoding generally refers to reporting a lower-level code than the service or condition that is appropriately supported by the documentation.

Both upcoding and inappropriate downcoding can create problems with coding accuracy and reimbursement.

The objective of a professional coder is accurate coding, not maximizing or minimizing payment.

15. What Is a Coding Guideline?

Answer:
Coding guidelines are rules and instructions that help coders determine how diagnoses and procedures should be reported.

They help with areas such as:

• Code selection
• Sequencing
• Combination codes
• Excludes notes
• Signs and symptoms
• Documentation requirements
• Specific coding situations

A good coder doesn’t just memorize codes—they understand how to apply the relevant guidelines.

16. What Is the Difference Between a Symptom and a Diagnosis?

Answer:
A symptom is something experienced or reported by the patient, such as pain, fever, nausea, or shortness of breath.

A diagnosis is a condition identified or documented by the healthcare provider.

When a definitive diagnosis has been established, the applicable coding guidelines determine whether symptoms should also be reported.

A coder should never independently diagnose the patient.

17. What Is a Combination Code?

Answer:
A combination code is a single code used to classify two diagnoses, a diagnosis with an associated complication, or a diagnosis with a commonly associated manifestation.

Combination codes can reduce the need for multiple codes when the classification system provides a single code that captures the required information.

18. What Are Excludes1 and Excludes2 Notes?

Answer:

Excludes1 generally means that the excluded condition should not be coded together with the code carrying the Excludes1 note because the two conditions are considered mutually exclusive in that context.

Excludes2 means that the excluded condition is not part of the condition represented by the code, but the patient may have both conditions at the same time.

Understanding these notes is important for accurate ICD-10-CM coding.

19. What Is Laterality in Medical Coding?

Answer:
Laterality identifies which side of the body is affected.

For example:

• Right
• Left
• Bilateral

Some ICD-10-CM codes require laterality.

A coder should carefully review the documentation rather than assuming which side is involved.

20. What Would You Do If the Documentation Is Unclear?

Answer:
I would not guess.

I would review the available documentation and follow the organization’s established query or clarification process when appropriate.

A medical coder should report information that is supported by the documentation and applicable coding guidelines.

This is a very important interview answer because accuracy is more important than guessing.

21. What Is a Medical Coding Audit?

Answer:
A medical coding audit is a review of coded healthcare records to determine whether the codes accurately represent the documentation and comply with applicable coding requirements.

Audits may identify:

• Coding errors
• Documentation issues
• Incorrect code selection
• Sequencing problems
• Modifier issues
• Compliance risks

Auditing can also help organizations improve coding quality.

22. What Is E/M Coding?

Answer:
E/M stands for Evaluation and Management.

E/M codes are used to report many healthcare encounters in which providers evaluate and manage patients.

Examples include certain office visits, hospital services, emergency department services, and other professional encounters.

E/M coding requires understanding the applicable guidelines and documentation requirements.

23. What Is the Importance of Anatomy and Physiology in Medical Coding?

Answer:
Anatomy and physiology help coders understand the human body and the relationship between organs, systems, diseases, and procedures.

For example, understanding body structures makes it easier to interpret medical documentation and distinguish between similar conditions or procedures.

This is why anatomy and physiology are important subjects in medical coding training.

24. Why Should We Hire You as a Fresher Medical Coder?

Answer:
“As a fresher, I understand that I still have a lot to learn, but I have built a strong foundation in medical terminology, anatomy and physiology, ICD-10-CM, CPT, HCPCS, and basic coding guidelines. I am detail-oriented, willing to learn, and comfortable receiving feedback. I would like to develop my skills through practical experience and contribute to the organization while continuously improving my coding accuracy.”

Keep your answer natural. Don’t memorize it word-for-word.

25. Why Do You Want to Build a Career in Medical Coding?

Answer:
“I am interested in the healthcare industry and enjoy work that requires attention to detail and analytical thinking. Medical coding gives me an opportunity to use my healthcare knowledge in a professional environment while continuing to learn. I also see it as a career where I can develop my skills through certification, experience, and specialization.”

Your answer should reflect your actual reason for choosing the field.

Bonus: Questions You May Be Asked as a Fresher

Technical questions aren’t the only questions that can appear in an interview.

Be prepared for questions such as:

• Tell me about yourself.
• Why did you choose medical coding?
• What did you learn during your training?
• Are you familiar with ICD-10-CM?
• What is your understanding of CPT?
• Are you comfortable working rotational shifts?
• How do you handle repetitive work?
• How do you maintain accuracy?
• What would you do if you made a coding mistake?
• Where do you see yourself in the next few years?

The best approach is to answer honestly and confidently rather than trying to give a complicated response.

How to Prepare for a Medical Coding Interview

Knowing interview questions is useful, but preparation should go beyond memorizing answers.

Revise Your Fundamentals

Make sure you understand:

Medical Terminology → Anatomy & Physiology → ICD-10-CM → CPT → HCPCS → Coding Guidelines

Practice Medical Records

Don’t only read definitions.

Practice identifying diagnoses, procedures, symptoms, documentation details, and coding-related information from sample records.

Understand Your Mistakes

When practicing, don’t just check whether your answer is right or wrong.

Ask yourself:

“Why is this code correct?”

That reasoning will help you handle unfamiliar interview questions.

Prepare for HR Questions

Technical knowledge is only one part of the interview.

Practice introducing yourself, explaining your educational background, discussing your strengths, and explaining why you want to work in medical coding.

Building Your Medical Coding Career in Bangalore

For students and graduates looking for healthcare career opportunities, Bangalore is an important location to consider.

If you’re searching for the best medical coding courses in Bangalore, don’t select an institute simply because it advertises a short course or promises quick results.

Look for training that includes practical coding, medical terminology, anatomy and physiology, ICD-10-CM, CPT, HCPCS, coding guidelines, certification preparation, and interview support.

When comparing the best medical coding institutes in Bangalore, practical exposure should be one of your biggest considerations.

The same applies if you are searching for the best medical coding training in Bangalore or best medical coding training institutes in Bangalore.

A good program should help you understand how coding works in real healthcare documentation—not just help you memorize answers for an interview.

Medical Coding Training at Unicode Healthcare Services

At Unicode Healthcare Services, students can build their medical coding foundation through structured learning covering areas such as medical terminology, anatomy and physiology, ICD-10-CM, CPT, HCPCS, coding guidelines, and practical case-based learning.

For freshers, the focus should be on developing the ability to understand medical documentation and apply coding concepts accurately.

Interview preparation is also important because knowing the subject and explaining your knowledge confidently are two different skills.

If you’re exploring best medical coding courses in Bangalore, best medical coding institutes in Bangalore, best medical coding online courses in Bangalore, best medical coding training in Bangalore, or best medical coding training institutes in Bangalore, compare the curriculum, practical exposure, trainer guidance, certification preparation, and career support before choosing a program.

Final Thoughts

Your first medical coding interview may feel intimidating, especially when you’re a fresher.

But remember: the interviewer isn’t necessarily expecting you to know everything.

They want to see whether you understand the fundamentals, think carefully, communicate clearly, and are willing to learn.

Revise your ICD-10-CM, CPT, HCPCS, medical terminology, anatomy and physiology, coding guidelines, modifiers, and basic medical coding concepts.

Most importantly, practice reading medical records and explaining why you would make a particular coding decision.

With the right preparation and practical training, you can walk into your first interview with much more confidence and take your first step toward a career in medical coding.