Medical Coding Comprehensive Review 2026–2027
Medical Coding Comprehensive Review Practice Questions,
Answers, and Detailed Rationales
Below is a comprehensive medical coding practice review
designed for nursing/healthcare learners. It focuses on ICD-10-CM, CPT, HCPCS,
documentation, sequencing, modifiers, medical necessity, and common coding
principles.
Question 1
Which coding system is primarily used in the United States
to report diagnoses and medical conditions?
A. CPT
B. ICD-10-CM
C. HCPCS Level II
D. DRG
Correct Answer: B. ICD-10-CM
Detailed Rationale:
ICD-10-CM (International Classification of Diseases, Tenth Revision, Clinical
Modification) is used to classify and report diagnoses, conditions, symptoms,
injuries, and other reasons for healthcare encounters. It provides standardized
diagnostic terminology for healthcare reporting and reimbursement.
Why the Other Options Are Incorrect:
• A. CPT: Primarily reports physician and other qualified healthcare professional procedures and
services.
• C. HCPCS Level II: Primarily reports supplies, equipment, medications, ambulance services, and
certain services not represented by CPT.
• D. DRG: A classification system used primarily for hospital inpatient payment and reimbursement
grouping rather than diagnosis coding itself.
Question 2
Which coding system is primarily used to report physician
procedures and professional services?
A. ICD-10-CM
B. CPT
C. ICD-10-PCS
D. MS-DRG
Correct Answer: B. CPT
Detailed Rationale:
Current Procedural Terminology (CPT), maintained by the American Medical
Association, is used to report many professional medical procedures and
services. CPT codes are organized into categories covering evaluation and
management, surgery, radiology, pathology/laboratory, medicine, and other
services.
Medical Coding Comprehensive Review 2026–2027 | Practice Resource • Page 1
, Medical Coding Comprehensive Review 2026–2027
Why the Other Options Are Incorrect:
• A. ICD-10-CM: Describes diagnoses and conditions.
• C. ICD-10-PCS: Used for inpatient hospital procedure coding in the United States.
• D. MS-DRG: Groups inpatient hospital cases for reimbursement rather than directly reporting
professional procedures.
Question 3
What is the primary purpose of ICD-10-CM coding?
A. To determine a nurse's staffing assignment
B. To classify diagnoses and health conditions
C. To calculate a patient's blood pressure
D. To identify hospital room numbers
Correct Answer: B. To classify diagnoses and health
conditions
Detailed Rationale:
ICD-10-CM provides standardized codes for diseases, disorders, injuries,
symptoms, and other health-related conditions. Accurate diagnosis coding
supports clinical documentation, billing, statistics, quality reporting, and
healthcare data analysis.
Why the Other Options Are Incorrect:
• A. Staffing assignments are not determined by ICD-10-CM codes.
• C. Blood pressure is a clinical measurement, not a purpose of diagnosis coding.
• D. Room assignments are administrative and unrelated to ICD-10-CM classification.
Question 4
A patient presents to the clinic with a documented diagnosis
of type 2 diabetes mellitus without complications. Which type of information is
most important when selecting the ICD-10-CM code?
A. The patient's favorite medication
B. Whether the provider documented complications
C. The patient's room number
D. The nurse's preferred terminology
Correct Answer: B. Whether the provider documented
complications
Detailed Rationale:
ICD-10-CM coding depends heavily on provider documentation. Diabetes codes
distinguish uncomplicated disease from diabetes with specific complications.
The coder should review the documentation to determine whether a complication
is present and documented.
Why the Other Options Are Incorrect:
• A. Medication preference does not determine the diagnosis code.
• C. Room number is irrelevant to diagnosis classification.
Medical Coding Comprehensive Review 2026–2027 | Practice Resource • Page 2
, Medical Coding Comprehensive Review 2026–2027
• D. Coding should follow standardized coding terminology and official guidance rather than individual
preference.
Question 5
What does CPT stand for?
A. Clinical Patient Treatment
B. Current Procedural Terminology
C. Comprehensive Procedure Table
D. Clinical Procedure Tracking
Correct Answer: B. Current Procedural Terminology
Detailed Rationale:
CPT stands for Current Procedural Terminology. CPT codes are used to
report medical procedures and professional services and are maintained by the
American Medical Association.
Why the Other Options Are Incorrect:
• A. Clinical Patient Treatment is not the meaning of CPT.
• C. Comprehensive Procedure Table is not the official name.
• D. Clinical Procedure Tracking is not what CPT stands for.
Question 6
Which code set is commonly used for durable medical
equipment and certain supplies?
A. HCPCS Level II
B. ICD-10-CM
C. ICD-10-PCS
D. CPT Category I only
Correct Answer: A. HCPCS Level II
Detailed Rationale:
HCPCS Level II codes are alphanumeric codes used for items and services such as
durable medical equipment, certain drugs, ambulance services, prosthetic
devices, orthotics, and medical supplies.
Why the Other Options Are Incorrect:
• B. ICD-10-CM: Classifies diagnoses.
• C. ICD-10-PCS: Reports inpatient hospital procedures.
• D. CPT Category I: Primarily reports physician and other qualified professional services and procedures.
Question 7
A provider documents "pneumonia" but does not
specify the organism. What should the coder generally do?
A. Automatically assign a bacterial pneumonia code
B. Code the documented diagnosis to the appropriate level of specificity
supported by the documentation
Medical Coding Comprehensive Review 2026–2027 | Practice Resource • Page 3
, Medical Coding Comprehensive Review 2026–2027
C. Assume the patient has viral pneumonia
D. Code the patient's chief complaint instead of the diagnosis
Correct Answer: B. Code the documented diagnosis to the
appropriate level of specificity supported by the documentation
Detailed Rationale:
Coders should not independently infer a causative organism that the provider
did not document. The code should reflect the available documentation and
applicable ICD-10-CM guidelines. When additional clarification is clinically
necessary and permitted, a query may be appropriate.
Why the Other Options Are Incorrect:
• A. A bacterial cause cannot automatically be assumed.
• C. Viral infection also cannot be assumed without documentation.
• D. When a definitive diagnosis is documented, coding generally follows the applicable diagnosis rather
than simply substituting the presenting symptom.
Question 8
What is the purpose of a medical coding modifier?
A. To replace the diagnosis code
B. To provide additional information about a reported procedure or
service
C. To identify the patient's insurance company
D. To determine the patient's age
Correct Answer: B. To provide additional information
about a reported procedure or service
Detailed Rationale:
CPT modifiers can provide additional information about circumstances
surrounding a service without changing the basic procedure code. Depending on
the modifier, they can indicate circumstances such as a distinct procedural
service, multiple procedures, or professional versus technical components.
Why the Other Options Are Incorrect:
• A. Modifiers supplement procedure coding; they do not replace diagnosis codes.
• C. Insurance identification is handled through payer and patient information.
• D. Patient age is demographic information, not the primary purpose of modifiers.
Question 9
Which organization maintains CPT codes?
A. American Medical Association
B. World Health Organization exclusively
C. Food and Drug Administration
D. Centers for Disease Control and Prevention exclusively
Medical Coding Comprehensive Review 2026–2027 | Practice Resource • Page 4
Medical Coding Comprehensive Review Practice Questions,
Answers, and Detailed Rationales
Below is a comprehensive medical coding practice review
designed for nursing/healthcare learners. It focuses on ICD-10-CM, CPT, HCPCS,
documentation, sequencing, modifiers, medical necessity, and common coding
principles.
Question 1
Which coding system is primarily used in the United States
to report diagnoses and medical conditions?
A. CPT
B. ICD-10-CM
C. HCPCS Level II
D. DRG
Correct Answer: B. ICD-10-CM
Detailed Rationale:
ICD-10-CM (International Classification of Diseases, Tenth Revision, Clinical
Modification) is used to classify and report diagnoses, conditions, symptoms,
injuries, and other reasons for healthcare encounters. It provides standardized
diagnostic terminology for healthcare reporting and reimbursement.
Why the Other Options Are Incorrect:
• A. CPT: Primarily reports physician and other qualified healthcare professional procedures and
services.
• C. HCPCS Level II: Primarily reports supplies, equipment, medications, ambulance services, and
certain services not represented by CPT.
• D. DRG: A classification system used primarily for hospital inpatient payment and reimbursement
grouping rather than diagnosis coding itself.
Question 2
Which coding system is primarily used to report physician
procedures and professional services?
A. ICD-10-CM
B. CPT
C. ICD-10-PCS
D. MS-DRG
Correct Answer: B. CPT
Detailed Rationale:
Current Procedural Terminology (CPT), maintained by the American Medical
Association, is used to report many professional medical procedures and
services. CPT codes are organized into categories covering evaluation and
management, surgery, radiology, pathology/laboratory, medicine, and other
services.
Medical Coding Comprehensive Review 2026–2027 | Practice Resource • Page 1
, Medical Coding Comprehensive Review 2026–2027
Why the Other Options Are Incorrect:
• A. ICD-10-CM: Describes diagnoses and conditions.
• C. ICD-10-PCS: Used for inpatient hospital procedure coding in the United States.
• D. MS-DRG: Groups inpatient hospital cases for reimbursement rather than directly reporting
professional procedures.
Question 3
What is the primary purpose of ICD-10-CM coding?
A. To determine a nurse's staffing assignment
B. To classify diagnoses and health conditions
C. To calculate a patient's blood pressure
D. To identify hospital room numbers
Correct Answer: B. To classify diagnoses and health
conditions
Detailed Rationale:
ICD-10-CM provides standardized codes for diseases, disorders, injuries,
symptoms, and other health-related conditions. Accurate diagnosis coding
supports clinical documentation, billing, statistics, quality reporting, and
healthcare data analysis.
Why the Other Options Are Incorrect:
• A. Staffing assignments are not determined by ICD-10-CM codes.
• C. Blood pressure is a clinical measurement, not a purpose of diagnosis coding.
• D. Room assignments are administrative and unrelated to ICD-10-CM classification.
Question 4
A patient presents to the clinic with a documented diagnosis
of type 2 diabetes mellitus without complications. Which type of information is
most important when selecting the ICD-10-CM code?
A. The patient's favorite medication
B. Whether the provider documented complications
C. The patient's room number
D. The nurse's preferred terminology
Correct Answer: B. Whether the provider documented
complications
Detailed Rationale:
ICD-10-CM coding depends heavily on provider documentation. Diabetes codes
distinguish uncomplicated disease from diabetes with specific complications.
The coder should review the documentation to determine whether a complication
is present and documented.
Why the Other Options Are Incorrect:
• A. Medication preference does not determine the diagnosis code.
• C. Room number is irrelevant to diagnosis classification.
Medical Coding Comprehensive Review 2026–2027 | Practice Resource • Page 2
, Medical Coding Comprehensive Review 2026–2027
• D. Coding should follow standardized coding terminology and official guidance rather than individual
preference.
Question 5
What does CPT stand for?
A. Clinical Patient Treatment
B. Current Procedural Terminology
C. Comprehensive Procedure Table
D. Clinical Procedure Tracking
Correct Answer: B. Current Procedural Terminology
Detailed Rationale:
CPT stands for Current Procedural Terminology. CPT codes are used to
report medical procedures and professional services and are maintained by the
American Medical Association.
Why the Other Options Are Incorrect:
• A. Clinical Patient Treatment is not the meaning of CPT.
• C. Comprehensive Procedure Table is not the official name.
• D. Clinical Procedure Tracking is not what CPT stands for.
Question 6
Which code set is commonly used for durable medical
equipment and certain supplies?
A. HCPCS Level II
B. ICD-10-CM
C. ICD-10-PCS
D. CPT Category I only
Correct Answer: A. HCPCS Level II
Detailed Rationale:
HCPCS Level II codes are alphanumeric codes used for items and services such as
durable medical equipment, certain drugs, ambulance services, prosthetic
devices, orthotics, and medical supplies.
Why the Other Options Are Incorrect:
• B. ICD-10-CM: Classifies diagnoses.
• C. ICD-10-PCS: Reports inpatient hospital procedures.
• D. CPT Category I: Primarily reports physician and other qualified professional services and procedures.
Question 7
A provider documents "pneumonia" but does not
specify the organism. What should the coder generally do?
A. Automatically assign a bacterial pneumonia code
B. Code the documented diagnosis to the appropriate level of specificity
supported by the documentation
Medical Coding Comprehensive Review 2026–2027 | Practice Resource • Page 3
, Medical Coding Comprehensive Review 2026–2027
C. Assume the patient has viral pneumonia
D. Code the patient's chief complaint instead of the diagnosis
Correct Answer: B. Code the documented diagnosis to the
appropriate level of specificity supported by the documentation
Detailed Rationale:
Coders should not independently infer a causative organism that the provider
did not document. The code should reflect the available documentation and
applicable ICD-10-CM guidelines. When additional clarification is clinically
necessary and permitted, a query may be appropriate.
Why the Other Options Are Incorrect:
• A. A bacterial cause cannot automatically be assumed.
• C. Viral infection also cannot be assumed without documentation.
• D. When a definitive diagnosis is documented, coding generally follows the applicable diagnosis rather
than simply substituting the presenting symptom.
Question 8
What is the purpose of a medical coding modifier?
A. To replace the diagnosis code
B. To provide additional information about a reported procedure or
service
C. To identify the patient's insurance company
D. To determine the patient's age
Correct Answer: B. To provide additional information
about a reported procedure or service
Detailed Rationale:
CPT modifiers can provide additional information about circumstances
surrounding a service without changing the basic procedure code. Depending on
the modifier, they can indicate circumstances such as a distinct procedural
service, multiple procedures, or professional versus technical components.
Why the Other Options Are Incorrect:
• A. Modifiers supplement procedure coding; they do not replace diagnosis codes.
• C. Insurance identification is handled through payer and patient information.
• D. Patient age is demographic information, not the primary purpose of modifiers.
Question 9
Which organization maintains CPT codes?
A. American Medical Association
B. World Health Organization exclusively
C. Food and Drug Administration
D. Centers for Disease Control and Prevention exclusively
Medical Coding Comprehensive Review 2026–2027 | Practice Resource • Page 4
