Measure ID: MIPS 506|Oncology|2026 Performance Year

Positive PD-L1 Biomarker Expression Test Result Prior to First-Line Immune Checkpoint

Percentage of patients aged 18 years and older with a diagnosis of metastatic non-small cell lung cancer (NSCLC) or squamous cell carcinoma of head and neck (HNSCC) on first-line immune checkpoint inhibitor (ICI) therapy, who had a positive PD-L1 biomarker expression test result prior to giving ICI therapy.

Process – High PriorityOncology

Last updated: January 15, 2026

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Measure Specification

Denominator (Eligible Population)

Patients aged 18 years and older on the date of the encounter
ANDDiagnosis for metastatic non-small cell lung cancer or squamous cell carcinoma of head and neck on the date of the encounter
ANDPatient encounters during the performance period
WITHOUTEncounters conducted via telehealth: M1426
ANDCurrently on first-line immune checkpoint inhibitors without chemotherapy: M1411

Denominator Exclusions1

M1412Patients with metastatic NSCLC with epidermal growth factor receptor (EGFR) mutations, ALK genomic tumor aberrations, or other targetable genomic abnormalities with approved first-line targeted therapy, such as NSCLC with ROS1 rearrangement, BRAF V600E mutation, NTRK 1/2/3 gene fusion, MET ex14 skipping mutation, and RET rearrangement

Numerator

Patients who had a positive PD-L1 biomarker expression test result prior to the initiation of first-line immune checkpoint inhibitor therapy.

Submission Codes (QDCs)

✓ Performance Met
M1413Patients who had a positive PD-L1 biomarker expression test result prior to the initiation of first-line immune checkpoint inhibitor therapy
✗ Performance Not Met
M1415Patients who did not have a positive PD-L1 biomarker expression test result prior to the initiation of first-line immune checkpoint inhibitor therapy

Denominator Exceptions

M1414Denominator Exception: Documentation of medical reason(s) for not performing the PD- L1 biomarker expression test prior to initiation of first-line immune checkpoint inhibitor therapy (e.g., patient is in an urgent or emergent situation where delay of treatment would jeopardize the patient’s health status; other medical reasons/contraindication)

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VBCA Insights

💡Why This Measure Matters

Patients with advanced lung cancer or head and neck cancer who are starting immunotherapy should have PD-L1 testing beforehand—a positive result predicts better response to checkpoint inhibitors and helps guide first-line therapy. NCCN guidelines recommend PD-L1 testing for these populations before treatment starts. Work with your pathology and oncology teams to ensure testing happens upfront; delaying treatment for testing may not be necessary if you order it concurrently with initial workup.

📖Clinical Rationale

The evidence-based NCCN Clinical Practice Guidelines in Oncology: Non-Small Cell Lung Cancer and NCCN Clinical Practice Guidelines in Oncology: Head and Neck Cancer address the measure’s quality actions of a positive PD-L1 biomarker expression test prior to giving first-line immune checkpoint inhibitor therapy in the metastatic NSCLC or squamous cell carcinoma of head and neck populations.

The measure will enhance compliance with the clinical guidelines by ensuring the eligible provider addresses timely biomarker testing that makes a difference in treatment decisions and improves patient outcomes.

📝Clinical Recommendations

Biomarker testing that is not timely may make a difference in treatment decisions and/or patient outcomes. Appropriate treatment delivery could be delayed, or ineffective therapies could be prescribed, resulting in poor clinical outcomes and unnecessary healthcare costs (Pai et al., 20120 Lim et al., 2015).

📋Implementation Notes

This measure contains one strata defined by a single submission criteria. This measure produces a single performance rate. For the purposes of MIPS implementation, this patient-process measure is submitted a minimum of once per patient during the performance period. The most advantageous quality data code will be used if the measure is submitted more than once.

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