What Is a National Coverage Determination (NCD)? A Medicare Guide for Wound Care Professionals

National Coverage Determinations (NCDs) are among the most important—and often misunderstood—tools the Centers for Medicare and Medicaid Services (CMS) uses to define what Medicare will and will not cover. For wound care professionals, understanding how NCDs function is essential to navigating reimbursement, compliance, and evolving coverage policy.

Key Takeaways

• NCDs are national Medicare policies that determine whether a service is covered across all jurisdictions.
• They are binding on all contractors and override conflicting local policies.
• Understanding NCD criteria is essential for compliance, documentation, and reimbursement in wound care.

What Is a National Coverage Determination (NCD)?

A National Coverage Determination (NCD) is a formal Medicare policy issued by the Centers for Medicare and Medicaid Services (CMS) that defines whether a specific item or service is covered nationwide under Medicare. NCDs are binding on all Medicare Administrative Contractors (MACs), meaning they apply uniformly across the United States.¹

An NCD is defined in the Social Security act as a determination “with respect to whether or not a particular item or service is covered nationally under this title.”² These decisions are rooted in the statutory requirement that Medicare only pays for items and services that are “reasonable and necessary for the diagnosis or treatment of illness or injury,” under section 1862(a)(1)(A) of the Social Security Act.²

How NCDs Are Developed

NCDs are typically issued through a formal CMS review process that evaluates:

• Clinical evidence (including peer-reviewed literature)
• Technology assessments
• Public comments
• Expert input, including advisory committees

CMS may initiate an NCD internally or in response to an external request. The process is transparent and includes opportunities for stakeholder engagement before a final determination is issued.¹

Importantly, NCDs often rely on evidence-based medicine principles. Reviews of Medicare coverage policy have shown that CMS increasingly incorporates systematic reviews and clinical outcomes data when making national decisions, particularly for new technologies and therapies.³

What an NCD Includes

An NCD typically specifies:

• Covered indications: The clinical scenarios in which Medicare will pay
• Non-covered uses: Situations where coverage is denied
• Limitations or conditions: Such as patient selection criteria or documentation requirements

These policies are codified in the Medicare National Coverage Determinations Manual and are accessible through the CMS Coverage Database.⁴

NCDs vs Local Coverage Determinations (LCDs)

Understanding the distinction between NCDs and Local Coverage Determinations (LCDs) is critical:

• NCDs:
  • Issued by CMS at the national level
  • Apply uniformly across all jurisdictions
  • Override any conflicting local policies
• LCDs:
  • Issued by regional MACs
  • Apply only within a contractor’s jurisdiction
  • Fill gaps where no NCD exists

If an NCD exists for a service, MACs must follow it. If no NCD exists, MACs may develop LCDs to define coverage at the local level.¹

In wound care, many advanced therapies—including skin substitutes—are primarily governed by LCDs rather than a single comprehensive NCD, which can contribute to variation in coverage requirements across regions.

Why NCDs Matter in Wound Care

For wound care professionals, NCDs serve as foundational coverage policy. Even when day-to-day decisions are guided by LCDs, NCDs establish overarching rules that can affect:

• Eligibility for reimbursement
• Documentation expectations
• Clinical indications considered reasonable and necessary

For example, NCDs related to adjunctive therapies (such as hyperbaric oxygen therapy) define strict criteria for coverage, including documentation of chronicity and failure of standard care.⁴ These principles often mirror expectations seen in LCDs for other advanced wound therapies.

Because NCDs are binding, failure to meet their criteria can result in claim denial regardless of local practice patterns.

NCDs and Evidence-Based Policy

CMS has increasingly emphasized evidence-based decision-making in national coverage policy. Analyses of Medicare coverage decisions have shown that clinical evidence—particularly randomized controlled trials and systematic reviews—plays a central role in determining whether a service is covered.³

However, NCDs also reflect broader policy considerations, including:

• Clinical benefit relative to existing therapies
• Generalizability of evidence to the Medicare population
• Program integrity and cost implications

This balance is especially relevant in wound care, where emerging technologies must demonstrate not only clinical effectiveness but also appropriate use within a Medicare population that often has complex comorbidities.

Operational Implications for Providers

For clinicians and administrators, understanding NCDs has several practical implications:

• Compliance: Documentation must align with national coverage criteria when applicable
• Billing accuracy: Claims must reflect covered indications and limitations
• Policy awareness: Changes to NCDs can have immediate nationwide impact

Unlike LCDs, which may vary by region, NCD updates affect all providers simultaneously. Staying current with CMS policy updates is therefore essential.

The Bottom Line

A National Coverage Determination (NCD) is a binding, nationwide Medicare policy that defines whether a service is covered and under what conditions. While many wound care services are governed locally, NCDs establish the legal and clinical framework for coverage decisions across the program.

For wound care professionals, understanding NCDs is key to ensuring compliant billing, aligning with evidence-based policy, and anticipating how coverage decisions may evolve over time.

References

1.     Centers for Medicare & Medicaid Services. Medicare Coverage Determination Process. Accessed April 2, 2026. https://www.cms.gov/medicare/coverage/determination-process.

2.     Social Security Administration. Social Security Act ¬ß1862(a)(1)(A), 42 U.S.C. ¬ß1395y(a)(1)(A). Accessed April 2, 2026. https://www.ssa.gov/OP_Home/ssact/title18/1862.htm. 

3.     Chambers JD, Chenoweth M, Cangelosi MJ, Pyo J, Cohen JT, Neumann PJ. Medicare is scrutinizing evidence more tightly for national coverage determinations. Health Aff (Millwood). 2015;34(2):253-260. doi:10.1377/hlthaff.2014.1123

4.     Centers for Medicare & Medicaid Services. Medicare National Coverage Determinations Manual (Pub. 100-03). CMS.gov. Accessed April 2, 2026. https://www.cms.gov/regulations-and-guidance/guidance/manuals/internet-only-manuals-ioms-items/cms014961.