Certified Medical Coding Specialist ICD-10-CM Diagnosis Coding 1 — Questions and Answers
Question 1: Which ICD-10-CM code category is used to report type 2 diabetes mellitus without complications?
- E11.9 (Correct answer)
- E10.9
- E13.9
- E08.9
Correct answer: E11.9
E11.9 is the ICD-10-CM code for type 2 diabetes mellitus without complications.
Question 2: In ICD-10-CM, what does the 7th character 'A' typically indicate in injury codes?
- Initial encounter (Correct answer)
- Subsequent encounter
- Sequela
- Active treatment
Correct answer: Initial encounter
The 7th character 'A' in ICD-10-CM injury codes designates the initial encounter for active treatment.
Question 3: Which ICD-10-CM guideline requires coding the underlying condition first, followed by the manifestation?
- Etiology/manifestation convention (Correct answer)
- Code first convention
- Excludes1 note
- Use additional code note
Correct answer: Etiology/manifestation convention
The etiology/manifestation convention requires the underlying disease to be sequenced first, with the manifestation code listed secondarily.
Question 4: An Excludes1 note in ICD-10-CM means:
- The excluded condition cannot be coded together with the code above it (Correct answer)
- The excluded condition may be coded together if both conditions are present
- The code is not billable
- Additional digits are required
Correct answer: The excluded condition cannot be coded together with the code above it
Excludes1 indicates a pure exclusion — the two conditions cannot occur together, so both codes should never be assigned simultaneously.
Question 5: Which section of ICD-10-CM contains codes for factors influencing health status, such as vaccination status?
- Z codes (Correct answer)
- V codes
- E codes
- Y codes
Correct answer: Z codes
Z codes (Z00–Z99) in ICD-10-CM classify factors influencing health status and contact with health services, including vaccination status.
Question 6: When coding a patient with essential hypertension and chronic kidney disease stage 3, the coder should assign:
- I12.9 — hypertensive chronic kidney disease with stage 3 CKD (Correct answer)
- I10 and N18.3 separately
- N18.3 only
- I10 only
Correct answer: I12.9 — hypertensive chronic kidney disease with stage 3 CKD
ICD-10-CM presumes a causal relationship between hypertension and CKD, requiring the combination code I12.9 plus N18.3.
Certified Medical Coding Specialist ICD-10-CM Diagnosis Coding 1
Which ICD-10-CM code category is used to report type 2 diabetes mellitus without complications?