Medicare LCD & NCD
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Medicare LCD and NCD Policy Lookup: What Physicians Need to Know Before Billing
Most Medicare claim denials are not random. They trace directly back to a coverage policy the billing team never checked. This guide explains how Medicare Local Coverage Determinations (LCDs) and National Coverage Determinations (NCDs) work — and how to use PolicyPeek to verify coverage before submitting a single claim.
What Is a Medicare LCD (Local Coverage Determination)?
A Local Coverage Determination (LCD) is a formal decision issued by a Medicare Administrative Contractor (MAC) — one of the private companies CMS contracts to process Medicare claims regionally — that defines when a specific medical service or item is considered medically necessary for Medicare coverage within that MAC’s jurisdiction.
Each LCD includes four key components that directly control whether your claim gets paid or denied:
- Covered ICD-10 diagnosis codes — the specific conditions that justify the service under Medicare
- CPT / HCPCS billing codes — the procedure codes the LCD applies to
- Documentation requirements — what clinical evidence must exist in the patient’s chart before billing
- Prior authorization rules — whether you need MAC approval before delivering the service
LCDs are jurisdiction-specific. Noridian JF may cover a service under different criteria than Palmetto GBA or NGS. A policy that pays in California may be denied in Florida. This is why verifying the correct MAC and its current LCD before billing is not optional — it is a fundamental billing safeguard.
LCD vs. NCD: What Is the Difference?
The distinction between an LCD and an NCD determines which coverage rules apply to your claim — and which document governs the outcome of an appeal if you are denied.
| Feature | LCD Local Coverage Determination | NCD National Coverage Determination |
|---|---|---|
| Who issues it | Regional Medicare Administrative Contractor (MAC) | CMS (Centers for Medicare & Medicaid Services) — federal level |
| Geographic scope | Applies only within that MAC’s jurisdiction | Applies uniformly in all 50 states and US territories |
| Policy ID format | Begins with “L” (e.g., L33822) | Numeric format (e.g., 220.6) |
| Override authority | Overridden by a conflicting NCD | Overrides all conflicting LCDs |
| When it applies | When no NCD exists for the service | Always — no NCD means the local MAC’s LCD governs |
| Common examples | CGM devices, sleep testing, power mobility devices | PET scans, TAVR, cochlear implants, bariatric surgery |
| Appeal pathway | Redetermination → Reconsideration → ALJ Hearing | Same pathway; NCD challenges may involve formal comment periods |
How PolicyPeek Works — And Why to Use It Before Billing
PolicyPeek is CureAdvantage’s free Medicare coverage policy search tool containing 2,072 active LCD and NCD policies sourced from the CMS Medicare Coverage Database (MCD). It is built specifically for physicians, billers, and practice managers who need to verify coverage criteria quickly — without navigating CMS’s complex search interface.
For full policy text, contractor-specific attachments, and appeal documentation, always verify against the source: cms.gov/medicare-coverage-database. PolicyPeek is designed for fast pre-billing checks — CMS MCD is authoritative for legal and audit purposes.
Why Medicare Coverage Policies Change — and What Triggers a Denial Wave
Medicare LCDs are living documents. CMS and MACs revise them in response to clinical evidence updates, OIG audit findings, Congressional mandates, and payer integrity programs. When a policy changes, practices that aren’t monitoring it continue billing under the old criteria — and face a wave of retroactive denials they don’t understand until the EOBs arrive.
Common reasons an LCD gets updated:
- New clinical thresholds — for example, the CGM policy (L33822) was updated in January 2025 to require A1C ≥ 7.5% for Type 2 patients, tightening a previously less-defined criterion
- Expanded CPT codes — the Remote Therapeutic Monitoring policy added 6 new CPT codes in February 2025 to reflect updated AMA coding guidance
- Age or severity criteria revisions — TAVR coverage was updated to lower the age threshold from 75 to 70 after new clinical trial data
- ICD-10 code additions or removals — annual ICD-10 code set updates require MACs to align covered diagnoses with newly added or deleted codes
- OIG program integrity findings — post-payment review findings can prompt MACs to tighten documentation or coverage criteria to reduce fraud risk
Prior Authorization Under Medicare LCDs: What Your Team Must Know
Prior authorization (PA) for Medicare is not a single uniform system. It operates differently depending on the service type, the MAC, and whether CMS has issued a mandatory PA program for that procedure category.
Three PA frameworks you’ll encounter in Medicare billing:
- MAC-level LCD prior authorization: The MAC requires PA for specific high-cost or high-volume services defined in its LCD. This is the most common type. Examples: power wheelchairs (K0823–K0857), stereotactic radiosurgery, TAVR.
- CMS mandatory PA program: CMS requires PA at the national level for certain surgical procedures — including certain spinal fusions, rhinoplasty, and blepharoplasty — under a program that has progressively expanded since 2020.
- ePA (electronic prior authorization): CMS has mandated electronic prior authorization workflows under the CMS Interoperability and Prior Authorization Final Rule. By January 2027, covered payers including Medicare Advantage plans must implement real-time ePrior authorization APIs.
When PolicyPeek flags a policy as requiring prior authorization, it means you must obtain MAC approval before delivering the service. Submitting a claim for a PA-required service without the authorization number results in an automatic CO-15 denial — and appeals on these denials rarely succeed if the service was already delivered without PA.
For additional tools to manage prior authorization workflows, see CureAdvantage’s Resources Library and the Smart Billing Assistant, which can help generate prior authorization letter templates based on LCD criteria.
CPT Code and ICD-10 Code Alignment: The Core of Coverage Compliance
A Medicare claim fails at the intersection of two codes: the CPT or HCPCS procedure code and the ICD-10 diagnosis code. Both must appear in the applicable LCD or NCD for the claim to be covered. One wrong code — even if clinically accurate — triggers an automatic denial.
Most common ICD-10 and CPT mismatch scenarios:
- Unspecified diagnosis codes billed against a specific LCD: Billing E11.9 (Type 2 diabetes, unspecified) when the CGM policy requires E11.65 (Type 2 with hyperglycemia)
- Laterality errors: Using a non-specific code when the LCD requires site-specific ICD-10 codes (e.g., bilateral vs. right-side-only)
- Outdated CPT codes: Billing a CPT code that was removed from the LCD’s covered code list in a recent update
- Upcoding adjacent CPT codes: Billing a higher-intensity version of a service that has its own LCD requirements not met by the patient’s documentation
Use CureAdvantage’s ICD-10 Code Search to look up the most specific available diagnosis code for your patient’s documented condition, then verify it against the covered codes in the applicable LCD using PolicyPeek. This two-step check before claim submission is the single most effective denial prevention workflow a practice can implement.
Advance Beneficiary Notices (ABN): When You Must Issue One
An Advance Beneficiary Notice of Noncoverage (ABN) is a CMS-mandated written notice you give a Medicare beneficiary before delivering a service you believe Medicare will not cover. It preserves your right to collect payment from the patient if the claim is denied.
An ABN is required when:
- The patient’s diagnosis does not match any covered ICD-10 code in the applicable LCD
- The service frequency exceeds Medicare’s covered limits (e.g., more lab tests than the policy allows per year)
- The service is statutorily excluded from Medicare coverage (e.g., routine dental, vision, or hearing)
- The patient does not meet clinical thresholds required by the LCD (e.g., A1C below CGM threshold)
An ABN is not required for services that are never covered under Medicare (statutory exclusions) — in those cases, Medicare’s ABN requirement does not apply, though many practices issue a blanket notice for clarity.
The official ABN form (CMS-R-131) is available from cms.gov. Practices should never use custom ABN language — CMS requires the official form with specific required elements.
LCD-Based Denial Prevention: A Practical Pre-Billing Workflow
The following workflow, adapted from billing compliance best practices, reduces LCD-related claim denials by addressing coverage verification at the point of care rather than after the claim is submitted.
Understanding the CMS Medicare Coverage Database (MCD)
PolicyPeek aggregates policy data from the CMS Medicare Coverage Database (MCD) — the authoritative federal repository for all Medicare coverage determinations. Understanding how the MCD is organized helps you verify policies for appeal purposes and stay current on revisions.
The MCD contains several document types beyond LCDs and NCDs that affect billing:
- Coverage Articles (CAs): Issued alongside LCDs to provide additional billing and coding instructions. They are not coverage decisions themselves but govern how to apply the LCD in practice.
- Proposed LCDs: Draft policies open for public comment before finalization. Monitoring proposed LCDs alerts you to upcoming changes to your billing environment 90–180 days in advance.
- Retired LCDs: Superseded or withdrawn policies. Billing under a retired LCD is a compliance risk — always verify active status.
- Local Coverage Articles (LCAs): MAC-issued documentation requirements that accompany active LCDs and specify what must be in the patient’s medical record.
For complete policy text, coverage articles, and historical revisions, visit the official CMS MCD →
Check Your Policy Before Submitting the Claim
PolicyPeek gives you instant access to 2,072 active Medicare LCD and NCD policies — free, no login required. Also explore CureAdvantage’s full suite of free billing tools.
Frequently Asked Questions About Medicare LCD & NCD Policies
A Medicare Local Coverage Determination (LCD) is a decision issued by a Medicare Administrative Contractor (MAC) that defines when a service or item is considered medically necessary within that MAC’s geographic jurisdiction. LCDs specify covered ICD-10 diagnosis codes, applicable CPT/HCPCS billing codes, clinical documentation requirements, and whether prior authorization is required.
LCDs are jurisdiction-specific — the same procedure may be covered under different criteria in different states. Always verify which MAC covers your practice’s billing address and search for that MAC’s specific LCD.
An NCD (National Coverage Determination) is issued by CMS centrally and applies uniformly in all 50 states. An LCD is issued by a regional MAC and applies only within that MAC’s jurisdiction. When both exist for the same service, the NCD takes precedence. When no NCD exists, the MAC’s LCD is the controlling coverage policy.
NCD policy IDs use a numeric format (e.g., 220.6 for PET scans). LCD policy IDs begin with “L” (e.g., L33822 for CGM).
Search by CPT/HCPCS code, specialty, or policy keyword using PolicyPeek above. Filter by your MAC’s name if known. You can also search the CMS Medicare Coverage Database by contractor (your MAC) and procedure code.
If no LCD exists for your procedure in your MAC’s jurisdiction, billing is governed by the MAC’s general medical necessity standard — which means you need solid clinical documentation but are not bound by a specific covered diagnosis code list. When in doubt, contact your MAC’s provider education line before billing.
Yes — often monthly. CMS and MACs update LCDs in response to new clinical evidence, OIG audit findings, annual ICD-10 code set changes, and Congressional mandates. High-change specialties include endocrinology, DME, oncology, sleep medicine, and home health.
Practices that are not actively monitoring LCD changes for their top CPT codes are billing blind. Use PolicyPeek’s Recent Updates tab to see which policies changed most recently, and set up MAC email alerts through your MAC’s provider relations portal.
Medicare will deny the claim, typically with denial code CO-50 (not medically necessary) or CO-167 (diagnosis not covered). If you did not issue an Advance Beneficiary Notice (ABN) before delivering the service, you cannot bill the patient — you must absorb the loss. Repeated billing outside LCD criteria can trigger a CMS OIG medical necessity audit and potential overpayment demand.
An Advance Beneficiary Notice of Noncoverage (ABN) is a written notice you give a Medicare patient before delivering a service you believe Medicare will not cover. It informs the patient they may be financially responsible for the cost and lets them decide whether to proceed. An ABN is required when there is a specific, documented reason to believe Medicare will deny the claim — such as a diagnosis that does not match the covered codes in the applicable LCD. The official form (CMS-R-131) is available on cms.gov.
No. PolicyPeek is a fast-access pre-billing verification tool designed for physician practices and billing teams. It is not a substitute for the authoritative CMS Medicare Coverage Database, which contains complete policy text, coverage articles, historical revisions, and legal documentation required for formal appeals. Use PolicyPeek to quickly check coverage criteria before submitting a claim; use CMS MCD when appealing a denial, preparing for an audit, or reviewing policy text in full.
Key Takeaways for Your Billing Team
- Every Medicare claim is governed by either an NCD (national) or LCD (regional). Always identify which policy applies before submitting.
- The ICD-10 code you bill must appear in the LCD’s covered code list — not just be related to the patient’s condition. Specificity is required.
- Prior authorization requirements are embedded in the LCD. A PA-required service delivered without prior approval will be denied and cannot be retroactively authorized.
- LCDs change regularly. Monitoring policy updates for your specialty’s top CPT codes is a core billing compliance function, not a one-time task.
- Issue an ABN whenever the patient’s documented diagnosis falls outside the LCD’s covered code list. Never recode the diagnosis to match the policy.
- Use PolicyPeek for fast pre-billing checks; use the CMS MCD for formal appeals, audits, and full policy text review.
- When a claim is denied with CO-50 or CO-167, reference the specific LCD policy ID in your appeal and document how the covered criteria were met.
Related Free Tools from CureAdvantage
PolicyPeek is one part of CureAdvantage’s free medical billing resource suite. These tools work together to help practices prevent denials, fix coding errors, and recover revenue:
- Denial Code Lookup — Look up all 358 CARC denial codes with plain-English explanations and appeal strategies for each.
- ICD-10 Code Search — Find the most specific ICD-10 diagnosis code for your patient’s documented condition — critical for LCD coverage matching.
- Revenue Leakage Calculator — Estimate how much your practice is losing to billing errors, undercoding, and denials annually.
- Smart Billing Assistant — AI-powered answers to billing questions, including prior authorization letter drafting and modifier guidance.
- Billing Blog — Expert articles on Medicare policy updates, coding changes, payer-specific rules, and practice management strategy.