A Local Coverage Determination in Medicare is a decision made by a Medicare Administrative Contractor (MAC) about whether a specific medical item or service is covered under Medicare Part A or Part B within that contractor’s geographic region. LCDs exist because Medicare doesn’t set every coverage rule at the national level, and where no national policy applies, the MAC serving your area decides whether a service meets Medicare’s “reasonable and necessary” standard. That means the same test, therapy, or piece of equipment can be covered under one set of criteria in your state and a different set in another.
Where LCDs Fit in Medicare Coverage Rules
Medicare coverage runs on two tiers. National Coverage Determinations (NCDs) come from the Centers for Medicare & Medicaid Services and apply the same way in every state. When CMS hasn’t issued an NCD on a particular service, the MACs step in and can issue an LCD for their jurisdiction.1Centers for Medicare & Medicaid Services. Medicare Coverage Determination Process
An LCD can never override an NCD. If a national rule says a service is covered or not covered, every MAC follows it. LCDs only fill gaps, and they give MACs room to reflect regional medical practice and clinical evidence in their coverage criteria.
The statutory basis sits in Section 1869(f)(2)(B) of the Social Security Act, codified at 42 U.S.C. ยง 1395ff(f)(2)(B). It defines an LCD as a contractor’s determination about whether a particular item or service is covered on a contractor-wide basis under Medicare Part A or Part B, consistent with the reasonable-and-necessary requirement.2GovInfo. 42 USC 1395ff
Who Writes LCDs and Why Coverage Varies by Region
MACs are private companies that CMS contracts with to run Medicare in assigned regions. They process claims, educate providers, make payment determinations, and develop local coverage policy.3Office of the Law Revision Counsel. 42 USC 1395kk-1 – Contracts With Medicare Administrative Contractors
Because different MACs cover different parts of the country, a service handled one way in the Southeast may have different criteria in the Pacific Northwest. A beneficiary in one region and a beneficiary in another can face different rules for the same lab test, therapy, or piece of durable medical equipment. That regional variation is deliberate: LCDs are meant to reflect the clinical evidence and practice patterns relevant to each region.
What an LCD Actually Contains
An LCD spells out the clinical circumstances under which Medicare will pay for a specific service. That usually includes the diagnoses that justify it, the documentation the provider needs to keep, and any limits on how often or how long the service can be delivered. An LCD might, for instance, list the exact diagnoses that qualify a patient for a particular imaging study, or cap the number of physical therapy sessions Medicare will pay for in a given period. LCDs also cover durable medical equipment such as wheelchairs and oxygen systems, with detailed medical criteria a patient has to meet.
The Companion Billing and Coding Article
Since 2019, CMS has required MACs to split the billing and coding details out of the LCD itself into a separate Local Coverage Article. The LCD now sticks to clinical coverage policy, while the article lists the CPT/HCPCS procedure codes and ICD-10 diagnosis codes providers use to bill.4Centers for Medicare & Medicaid Services. LCD – Category III Codes (L35490) To check coverage for a service, you typically read both documents together: the LCD tells you whether it’s covered, and the article tells you how to code and bill it.
How an LCD Affects Your Claim
If your provider orders a service and the LCD in your region says it isn’t covered for your diagnosis, Medicare will deny the claim. The denial doesn’t mean the service was medically wrong for you. It means it didn’t meet the MAC’s specific criteria for payment.
Before delivering a service they expect Medicare to deny, providers are supposed to give you an Advance Beneficiary Notice of Noncoverage (ABN) on CMS Form CMS-R-131. The ABN tells you the service probably won’t be covered and lays out your options: receive it and agree to pay out of pocket, or decline it. Signing the ABN shifts the financial responsibility to you.5Centers for Medicare & Medicaid Services. FFS ABN
If a provider skips the ABN before performing a service Medicare later denies, the provider generally cannot bill you for it. That’s the main protection the ABN process gives beneficiaries.
If You’re in Medicare Advantage
LCDs still apply if you’re enrolled in a Medicare Advantage plan. CMS requires MA plans to follow both NCDs and LCDs, along with the general coverage rules that govern Original Medicare.6Centers for Medicare & Medicaid Services. 2024 Medicare Advantage and Part D Final Rule (CMS-4201-F)
Where the NCDs and LCDs don’t fully define coverage for a service, MA plans can add internal coverage criteria. Those criteria must be based on current evidence from widely used treatment guidelines or clinical literature, and the plan must make them publicly available to CMS, enrollees, and providers. Every MA plan also has to run a Utilization Management Committee that reviews its coverage policies each year against traditional Medicare’s national and local coverage decisions.
Appealing a Denial Based on an LCD
If Medicare denies your claim under an LCD, you can appeal. Original Medicare uses a five-level appeals process, and you can escalate each time you disagree.7Medicare.gov. Appeals in Original Medicare
- Level 1, Redetermination: the same MAC that denied the claim reviews it again. You have 120 days from the date on your denial notice to file, and the MAC generally decides within 60 days.
- Level 2, Reconsideration by a Qualified Independent Contractor: an independent organization that had no part in the first decision reviews the claim. You have 180 days after the Level 1 decision, and the QIC generally responds within 60 days.
- Level 3, Hearing before an Administrative Law Judge: for 2026, the claim must involve at least $200 in dispute. You have 60 days from the QIC’s decision to request the hearing.
- Level 4, Medicare Appeals Council review: the Council conducts a fresh review of the ALJ decision. You have 60 days to request review, and the Council generally decides within 90 days.
- Level 5, Federal district court: for 2026, at least $1,960 must be in controversy. You can combine claims to reach that amount.
This process challenges the denial of your individual claim. It’s the right path when you think your medical situation actually fits the LCD’s criteria and the MAC read the facts wrong.
Challenging the LCD Itself
Appealing a claim and challenging the LCD are different things. A claim appeal says your situation fits the LCD. An LCD challenge says the LCD’s criteria are unreasonable in the first place. Federal regulations at 42 CFR Part 426 provide the separate process for contesting the policy.8eCFR. Review of an LCD (42 CFR Part 426 Subpart D)
To file, you have to qualify as an “aggrieved party,” meaning the LCD adversely affects you. Your complaint needs a written statement from your treating physician confirming you need the service, plus clinical or scientific evidence explaining why the LCD isn’t reasonable. Deadlines are strict: six months from your physician’s written statement if you file before receiving the service, or 120 days from the initial denial notice if you file after the claim is denied.
An Administrative Law Judge reviews the complaint against a reasonableness standard based on the available evidence. If the ALJ finds the LCD unreasonable, the MAC can be forced to revise or retire it. Either side can appeal the ALJ’s ruling to the Departmental Appeals Board. This route is heavier than a standard claim appeal, but it’s the tool for when the problem is the policy rather than the facts of your case.
Looking Up an LCD
The Medicare Coverage Database, maintained by CMS, is the central place to search for any LCD. You can search by keyword, document ID, or billing code, and results include both the LCD and any linked billing and coding article.9Centers for Medicare & Medicaid Services. Medicare Coverage Database
The database holds active LCDs, proposed LCDs open for public comment, and archived determinations that are no longer in effect. It also carries NCDs and National Coverage Analyses, so you can check whether a national rule already answers your question before you look at local policy.10Centers for Medicare & Medicaid Services. How to Use the Medicare Coverage Database If you’re a beneficiary trying to figure out why a claim was denied, the database search is usually the fastest first step.