NR511 | NR511 Differential Diagnosis & Primary
Care Exam 1 v2 | Questions with Correct Answers
and Expert Explanation for Each Question |
Chamberlain
1. Which component of the SOAP note includes the clinician’s physical examination findings?
A. Subjective
B. Plan
C. Assessment
D. Objective
Correct Answer: D
Expert Explanation: The Objective section of the SOAP note is where the provider records
measurable and observable data, such as vital signs and physical exam findings. This is
contrasted with the Subjective section, which contains the patient’s reported symptoms
and history. Accurate documentation in the Objective section is crucial for supporting the
final diagnosis and billing levels.
2. In the context of diagnostic testing, what does ‘sensitivity’ refer to?
A. The ability of a test to correctly identify those with the disease
B. The probability that a positive test result means the patient has the disease
C. The ability of a test to correctly identify those without the disease
D. The consistency of a test result over repeated trials
Correct Answer: A
Expert Explanation: Sensitivity is defined as the proportion of people with a disease who
test positive, often referred to as the ‘true positive’ rate. High sensitivity is particularly
useful for screening tests to ensure that few cases are missed. Conversely, specificity refers
to the ability to identify those who do not have the condition.
3. When considering the ‘worst-case scenario’ in a differential diagnosis, the provider is:
A. Identifying the most likely diagnosis based on prevalence
B. Prioritizing life-threatening conditions that must be ruled out
C. Predicting the patient’s long-term prognosis
D. Evaluating the cost-effectiveness of treatment options
Correct Answer: B
,Expert Explanation: Differential diagnosis requires the clinician to consider ‘must-not-
miss’ diagnoses that could lead to significant morbidity or mortality. This safety-first
approach ensures that critical conditions like pulmonary embolism or myocardial
infarction are evaluated even if they aren’t the most probable. Ruling out the worst-case
scenario is a foundational step in primary care clinical reasoning.
4. A 24-year-old female presents with a ‘honey-colored’ crusted lesion on her upper lip. What
is the most likely diagnosis?
A. Impetigo
B. Herpes Simplex Virus
C. Cellulitis
D. Contact Dermatitis
Correct Answer: A
Expert Explanation: Impetigo is a highly contagious bacterial skin infection often
characterized by honey-colored crusting, most commonly caused by Staphylococcus aureus
or Streptococcus pyogenes. While Herpes Simplex may involve vesicles, the classic
description of ‘honey-crusted’ lesions is pathognomonic for non-bullous impetigo.
Treatment typically involves topical antibiotics like mupirocin or oral antibiotics if the
infection is widespread.
5. Which ICD-10 coding principle is essential for justifying the medical necessity of a visit?
A. Assigning codes based on the provider’s suspected diagnosis only
B. Always using a ‘Signs and Symptoms’ code regardless of the diagnosis
C. Using the most specific code available that is supported by documentation
D. Coding for conditions the patient had five years ago that are currently resolved
Correct Answer: C
Expert Explanation: ICD-10 codes must reflect the highest level of specificity supported
by the clinical documentation in the medical record. Medical necessity is established when
the diagnosis code justifies the services or procedures performed during the encounter.
Using vague or non-specific codes can lead to claim denials or audits.
6. An 8-year-old child presents with a ‘slapped-cheek’ appearance and a lacy, reticular rash on
the trunk. Which virus is likely responsible?
A. Varicella-zoster virus
B. Human Herpesvirus 6
C. Coxsackievirus
D. Parvovirus B19
, Correct Answer: D
Expert Explanation: Parvovirus B19 is the causative agent of Erythema Infectiosum, also
known as Fifth Disease. It typically presents with a bright red rash on the cheeks and a
subsequent maculopapular rash on the extremities that takes on a lacy appearance. This
condition is usually self-limiting but requires careful monitoring in pregnant women or
patients with sickle cell disease.
7. In evidence-based practice, which of the following is considered the highest level of
evidence?
A. Systematic reviews or meta-analyses
B. Case-control studies
C. Expert opinion
D. Cohort studies
Correct Answer: A
Expert Explanation: The hierarchy of evidence places systematic reviews and meta-
analyses of randomized controlled trials (RCTs) at the top because they synthesize data
from multiple high-quality studies. This level of evidence provides the most robust basis for
making clinical decisions. Lower levels, such as expert opinion or case reports, are more
susceptible to bias.
8. According to the E&M guidelines, which three components are traditionally used to
determine the level of service for a new patient?
A. Vital signs, Diagnosis, and Follow-up
B. Chief Complaint, Assessment, and Plan
C. History, Physical Exam, and Medical Decision Making
D. Time, Counseling, and Coordination of care
Correct Answer: C
Expert Explanation: Historically, the three key components for determining an Evaluation
and Management (E&M) level for new patients were the history, physical exam, and
medical decision making (MDM). While 2021 updates emphasize MDM or time for
outpatient visits, understanding the traditional triad remains important for comprehensive
documentation. For new patients, all three components typically had to meet the required
level.
9. A patient presents with a painful, erythematous, and swollen area on the lower leg with
poorly defined borders. There is no fluctuance. What is the most likely diagnosis?
A. Abscess
B. Folliculitis
Care Exam 1 v2 | Questions with Correct Answers
and Expert Explanation for Each Question |
Chamberlain
1. Which component of the SOAP note includes the clinician’s physical examination findings?
A. Subjective
B. Plan
C. Assessment
D. Objective
Correct Answer: D
Expert Explanation: The Objective section of the SOAP note is where the provider records
measurable and observable data, such as vital signs and physical exam findings. This is
contrasted with the Subjective section, which contains the patient’s reported symptoms
and history. Accurate documentation in the Objective section is crucial for supporting the
final diagnosis and billing levels.
2. In the context of diagnostic testing, what does ‘sensitivity’ refer to?
A. The ability of a test to correctly identify those with the disease
B. The probability that a positive test result means the patient has the disease
C. The ability of a test to correctly identify those without the disease
D. The consistency of a test result over repeated trials
Correct Answer: A
Expert Explanation: Sensitivity is defined as the proportion of people with a disease who
test positive, often referred to as the ‘true positive’ rate. High sensitivity is particularly
useful for screening tests to ensure that few cases are missed. Conversely, specificity refers
to the ability to identify those who do not have the condition.
3. When considering the ‘worst-case scenario’ in a differential diagnosis, the provider is:
A. Identifying the most likely diagnosis based on prevalence
B. Prioritizing life-threatening conditions that must be ruled out
C. Predicting the patient’s long-term prognosis
D. Evaluating the cost-effectiveness of treatment options
Correct Answer: B
,Expert Explanation: Differential diagnosis requires the clinician to consider ‘must-not-
miss’ diagnoses that could lead to significant morbidity or mortality. This safety-first
approach ensures that critical conditions like pulmonary embolism or myocardial
infarction are evaluated even if they aren’t the most probable. Ruling out the worst-case
scenario is a foundational step in primary care clinical reasoning.
4. A 24-year-old female presents with a ‘honey-colored’ crusted lesion on her upper lip. What
is the most likely diagnosis?
A. Impetigo
B. Herpes Simplex Virus
C. Cellulitis
D. Contact Dermatitis
Correct Answer: A
Expert Explanation: Impetigo is a highly contagious bacterial skin infection often
characterized by honey-colored crusting, most commonly caused by Staphylococcus aureus
or Streptococcus pyogenes. While Herpes Simplex may involve vesicles, the classic
description of ‘honey-crusted’ lesions is pathognomonic for non-bullous impetigo.
Treatment typically involves topical antibiotics like mupirocin or oral antibiotics if the
infection is widespread.
5. Which ICD-10 coding principle is essential for justifying the medical necessity of a visit?
A. Assigning codes based on the provider’s suspected diagnosis only
B. Always using a ‘Signs and Symptoms’ code regardless of the diagnosis
C. Using the most specific code available that is supported by documentation
D. Coding for conditions the patient had five years ago that are currently resolved
Correct Answer: C
Expert Explanation: ICD-10 codes must reflect the highest level of specificity supported
by the clinical documentation in the medical record. Medical necessity is established when
the diagnosis code justifies the services or procedures performed during the encounter.
Using vague or non-specific codes can lead to claim denials or audits.
6. An 8-year-old child presents with a ‘slapped-cheek’ appearance and a lacy, reticular rash on
the trunk. Which virus is likely responsible?
A. Varicella-zoster virus
B. Human Herpesvirus 6
C. Coxsackievirus
D. Parvovirus B19
, Correct Answer: D
Expert Explanation: Parvovirus B19 is the causative agent of Erythema Infectiosum, also
known as Fifth Disease. It typically presents with a bright red rash on the cheeks and a
subsequent maculopapular rash on the extremities that takes on a lacy appearance. This
condition is usually self-limiting but requires careful monitoring in pregnant women or
patients with sickle cell disease.
7. In evidence-based practice, which of the following is considered the highest level of
evidence?
A. Systematic reviews or meta-analyses
B. Case-control studies
C. Expert opinion
D. Cohort studies
Correct Answer: A
Expert Explanation: The hierarchy of evidence places systematic reviews and meta-
analyses of randomized controlled trials (RCTs) at the top because they synthesize data
from multiple high-quality studies. This level of evidence provides the most robust basis for
making clinical decisions. Lower levels, such as expert opinion or case reports, are more
susceptible to bias.
8. According to the E&M guidelines, which three components are traditionally used to
determine the level of service for a new patient?
A. Vital signs, Diagnosis, and Follow-up
B. Chief Complaint, Assessment, and Plan
C. History, Physical Exam, and Medical Decision Making
D. Time, Counseling, and Coordination of care
Correct Answer: C
Expert Explanation: Historically, the three key components for determining an Evaluation
and Management (E&M) level for new patients were the history, physical exam, and
medical decision making (MDM). While 2021 updates emphasize MDM or time for
outpatient visits, understanding the traditional triad remains important for comprehensive
documentation. For new patients, all three components typically had to meet the required
level.
9. A patient presents with a painful, erythematous, and swollen area on the lower leg with
poorly defined borders. There is no fluctuance. What is the most likely diagnosis?
A. Abscess
B. Folliculitis
