HIV Disease A patient with known HIV is admitted for treatment of Pneu

HIV Disease A patient with known HIV is admitted for treatment of Pneumocystis jirovecii pneumonia (PJP) caused by HIV. A. B59, Z21 B. Z21, B59 C. B20, B59 D. B59, B20 Answ C 2. HIV Positive Without Symptoms A patient tests HIV positive during routine screening. The physician documents asymptomatic HIV infection. No HIV-related illness is present. A. B20 B. Z21 C. Z11.4 D. R75 Answer B 3. HIV with Tuberculosis A patient with HIV disease is admitted for active pulmonary tuberculosis. A. A15.0, B20 B. B20, A15.0 C. Z21, A15.0 D. B90.9, B20 Answer: B 4. HIV Pregnancy A pregnant woman in the third trimester has HIV disease and receives care for HIV management. A. B20, O98.713 B. O98.713, B20 C. Z21, O98.713 D. O99.89, B20 Answer: B 5. HIV with Kaposi Sarcoma A patient has HIV disease with Kaposi sarcoma. A. B20, C46.9 B. C46.9, B20 C. Z21, C46.9 D. R75, C46.9 Answer: A 6. HIV Exposure A healthcare worker experiences a needlestick from an HIV-positive patient. The worker is not infected. A. Z20.6 B. Z21 C. B20 D. R75 Answer: A 7. Inconclusive HIV Test The physician documents inconclusive HIV laboratory findings. A. B20 B. Z21 C. R75 D. Z20.6 Answer: C 8. HIV Disease with Oral Candidiasis A patient with HIV disease has oral candidiasis. A. B37.0, B20 B. B20, B37.0 C. Z21, B37.0 D. R75, B37.0 Ans- B 9. HIV Disease History A patient previously diagnosed with HIV disease is admitted for bacterial pneumonia unrelated to HIV. A. Z21 B. B20, J15.9 C. J15.9 only Ans B 10. New HIV Diagnosis with Symptoms A newly diagnosed patient has HIV infection with cryptococcal meningitis. A. B45.1, Z21 B. B20, B45.1 C. R75, B45.1 D. Z20.6, B45.1 Ans B

Here's a clear breakdown of all 10 HIV ICD-10-CM coding questions with explanations:

ICD-10-CM HIV Coding - Key Codes

Code	Meaning
B20	HIV disease (symptomatic / confirmed HIV with illness)
Z21	Asymptomatic HIV infection status
R75	Inconclusive laboratory evidence of HIV
Z20.6	Contact/exposure to HIV (not infected)
Z11.4	Screening for HIV

Question-by-Question Explanations

1. HIV + PJP Pneumonia → C. B20, B59

The patient has HIV disease (symptomatic - PJP is an AIDS-defining illness), so B20 is sequenced first as the principal diagnosis.
B59 (Pneumocystosis/PJP) follows as the manifestation.
Rule: When HIV disease is the reason for admission along with an HIV-related condition, B20 leads.

2. Asymptomatic HIV → B. Z21

No HIV-related illness is documented. The physician explicitly states asymptomatic.
Z21 = HIV-positive status without symptoms or illness.
B20 is never used for asymptomatic patients.

3. HIV + Active TB → B. B20, A15.0

Patient has HIV disease (not just status) with active pulmonary TB.
B20 is sequenced first per ICD-10-CM guidelines (HIV always leads when HIV disease is present).
A15.0 (TB of lung) follows as the associated condition.

4. HIV in Pregnancy → B. O98.713, B20

In pregnancy, obstetric codes take sequencing priority.
O98.713 = HIV disease complicating pregnancy, third trimester - sequenced first.
B20 follows as the underlying HIV disease code.
Rule: OB codes lead in pregnant HIV patients.

5. HIV + Kaposi Sarcoma → A. B20, C46.9

HIV disease is present with Kaposi sarcoma (an AIDS-defining malignancy).
B20 leads, C46.9 (Kaposi sarcoma, unspecified) follows.
Same rule: B20 always leads when HIV disease is the primary condition.

6. Needlestick Exposure (Not Infected) → A. Z20.6

The worker was exposed but is not infected.
Z20.6 = Contact with and (suspected) exposure to HIV.
Z21 would be used only if they tested positive (asymptomatic).
B20 requires confirmed HIV disease with symptoms.

7. Inconclusive HIV Test → C. R75

Lab results are inconclusive - HIV cannot be confirmed or ruled out.
R75 = Inconclusive laboratory evidence of HIV.
Do not assign B20 or Z21 until diagnosis is confirmed.

8. HIV + Oral Candidiasis → B. B20, B37.0

HIV disease is present (oral candidiasis is an HIV-related opportunistic infection).
B20 leads, B37.0 (Candidiasis of mouth) follows.
Consistent rule: B20 always sequenced first when HIV disease drives care.

9. Prior HIV Diagnosis, Admitted for Bacterial Pneumonia → B. B20, J15.9

Once a patient has been diagnosed with HIV disease (B20), that code is always assigned on every subsequent encounter - it is never downgraded back to Z21.
B20 + J15.9 (bacterial pneumonia) even if the pneumonia is unrelated to HIV.
HIV disease is a permanent, reportable diagnosis.

10. New HIV Diagnosis + Cryptococcal Meningitis → B. B20, B45.1

Cryptococcal meningitis is an AIDS-defining illness, confirming HIV disease (not just status).
B20 leads, B45.1 (Cryptococcal meningitis) follows as the manifestation.
R75 would only apply before diagnosis is confirmed.

Core Sequencing Rules Summary

B20 always leads when HIV disease is present (except in pregnancy)
Pregnancy exception - Obstetric code (O98.7xx) sequences before B20
Z21 = asymptomatic only; never use if any HIV illness is present
Once B20 is assigned, it stays on all future encounters permanently
R75 = inconclusive lab only; Z20.6 = exposure without infection

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All 10 answers are correct. Here's the cross-check verdict with the governing ICD-10-CM guideline for each:

Cross-Check Results

#	Given Answer	Verdict	Governing Rule
1	C. B20, B59	✅ Correct	ICD-10-CM Guideline I.C.1.a.1 - B20 sequenced first when patient is admitted for HIV-related condition
2	B. Z21	✅ Correct	Guideline I.C.1.a.2 - Z21 for asymptomatic HIV; never use B20 without documented illness
3	B. B20, A15.0	✅ Correct	Guideline I.C.1.a.1 - B20 always leads when HIV disease is present, regardless of what condition prompted admission
4	B. O98.713, B20	✅ Correct	Guideline I.C.15 - In pregnancy, the obstetric chapter code (O98.713) sequences before B20
5	A. B20, C46.9	✅ Correct	Guideline I.C.1.a.1 - B20 leads; Kaposi sarcoma is an AIDS-defining condition coded additionally
6	A. Z20.6	✅ Correct	Z20.6 = exposure/contact only; no infection confirmed; Z21 and B20 both require confirmed HIV positivity
7	C. R75	✅ Correct	R75 = inconclusive lab evidence; do not assign B20 or Z21 until HIV status is definitively established
8	B. B20, B37.0	✅ Correct	Guideline I.C.1.a.1 - B20 leads; oral candidiasis (B37.0) is an HIV-related opportunistic infection coded additionally
9	B. B20, J15.9	✅ Correct	Guideline I.C.1.a.2(f) - Once HIV disease (B20) is established, it is coded on every subsequent encounter even if unrelated condition is the reason for admission
10	B. B20, B45.1	✅ Correct	Guideline I.C.1.a.1 - Cryptococcal meningitis confirms HIV disease; B20 leads, B45.1 follows as manifestation

One Flag to Note

Question 4 - The answer B (O98.713, B20) is correct per sequencing rules, but note that the full code set should also include a code for the trimester of the pregnancy encounter and a code from Z3A (weeks of gestation) if documented. For exam purposes, the two-code answer given is the correct choice among the options provided.

All answers align with ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C.1.a (HIV Infections). No corrections needed.

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