Diagnosis and Management of Positive PPD Test Results

ICD-10 Coding and Chest X-Ray Evaluation

The Centers for Disease Control and Prevention recommends using ICD-10 code R76.11 for a positive PPD test result in an asymptomatic patient without evidence of active disease 1
The American Thoracic Society suggests that if chest X-ray reveals findings consistent with old healed TB, the code for latent tuberculosis infection should be used after active disease is excluded 2, 3
The Centers for Disease Control and Prevention recommends coding as A15.0 (respiratory tuberculosis) or appropriate subcategory based on site if active TB is confirmed 1

The American College of Radiology recommends that all individuals with newly recognized positive PPD test results must undergo chest radiography to exclude active tuberculosis before any treatment decisions 1, 4
The Centers for Disease Control and Prevention suggests that upper lobe infiltration with or without cavitation strongly suggests active TB 5, 6
The American College of Radiology recommends evaluating for apical or subapical posterior upper lobe nodular infiltrates, which is a classic pattern for active disease 5, 6
The Centers for Disease Control and Prevention suggests that superior segment lower lobe involvement is another typical location for active TB 5, 6
The American College of Radiology recommends evaluating for hilar or mediastinal lymphadenopathy, particularly in immunocompromised patients 5, 6

The Centers for Disease Control and Prevention recommends ordering chest X-ray immediately after positive PPD 1, 4
The American Thoracic Society suggests that if chest X-ray shows any abnormality or patient has any TB symptoms, sputum should be collected for AFB smear and culture x3 specimens on different days 2, 3, 5
The Centers for Disease Control and Prevention recommends proceeding with treatment for latent TB infection if chest X-ray is normal and patient is asymptomatic 1, 4
The American Thoracic Society suggests that if chest X-ray shows old healed TB findings, sputum cultures should still be obtained to definitively exclude active disease before treating as latent TB 2, 3
The Centers for Disease Control and Prevention recommends considering CT chest if clinical suspicion of TB remains high in immunocompromised patients, especially those with HIV and CD4 <100 5, 6
The American Thoracic Society suggests that BCG vaccination history does not change management, and a PPD ≥10mm in adults from high-prevalence countries who received BCG as children should be attributed to M. tuberculosis infection, not vaccine 5

The Centers for Disease Control and Prevention recommends documenting PPD induration size in millimeters 1, 4
The American College of Physicians suggests documenting risk factors present, such as HIV, immunosuppression, close contact, healthcare worker, or immigrant from endemic area 1
The Centers for Disease Control and Prevention recommends documenting chest X-ray results with specific description of any abnormalities 1, 4
The American College of Physicians suggests documenting presence or absence of TB symptoms, such as cough >3 weeks, hemoptysis, fever, night sweats, or weight loss 1, 4

All newly identified positive tuberculin skin test (PPD) results require immediate chest radiography and a focused clinical examination to rule out active tuberculosis before any work clearance can be granted. 7
During the clinical assessment, clinicians should specifically inquire about a cough lasting ≥ 3 weeks, hemoptysis, fever, night sweats, unintended weight loss, or anorexia. 8

If the chest X‑ray shows any abnormality or the patient reports any TB‑compatible symptoms, the individual must be excluded from work pending further evaluation, including collection of three sputum specimens for acid‑fast bacilli smear and culture on separate days. 7
When the chest X‑ray is normal and the individual is asymptomatic, the condition is classified as latent TB infection (LTBI) and work clearance may be granted. 9

A positive PPD result must be recorded in the employee health record, and the employee’s prior test history should be reviewed to determine whether the result represents a conversion from a previous negative test. 7
If conversion is identified, the workplace exposure source should be investigated and drug‑susceptibility testing of the source case should be obtained when possible. 9

A history of Bacillus Calmette‑Guérin (BCG) vaccination does not alter management; in adults from high‑prevalence countries who received BCG as children, a PPD induration ≥ 10 mm should be interpreted as evidence of Mycobacterium tuberculosis infection rather than vaccine effect. 10