Overview
A Local Coverage Determination (LCD) is a policy document issued by a Medicare Administrative Contractor (MAC) that specifies the conditions under which Medicare will cover a particular service, procedure, or item in the MAC's jurisdiction. LCDs exist to apply the statutory "reasonable and necessary" standard (Social Security Act §1862(a)(1)(A)) to specific clinical scenarios where Medicare coverage is otherwise ambiguous and where CMS has not issued a National Coverage Determination (NCD).
Each MAC — Noridian, Palmetto GBA, CGS, WPS, Novitas, First Coast Service Options, National Government Services — issues LCDs for the states within its jurisdiction. LCDs are binding on all providers in that jurisdiction. When an NCD exists, the NCD controls; LCDs may add local details but may not conflict with the NCD. When multiple MACs have overlapping jurisdictions for particular services (DME, home health, hospice), jurisdictional rules determine which LCD applies.
An LCD typically contains: (1) coverage indications and limitations — the clinical conditions under which the service is covered; (2) covered ICD-10-CM diagnosis codes that support medical necessity; (3) covered CPT/HCPCS procedure codes; (4) frequency limits where applicable; (5) documentation requirements — what the medical record must contain to support the claim; (6) utilization guidelines including experimental/investigational exclusions; (7) effective and revision dates. Associated Articles provide additional billing and coding guidance, examples, and frequency detail.
LCDs go through a formal development process with contractor advisory committees (CACs), open meetings, public comment periods, and retirement or revision cycles. Draft LCDs are published in the CMS Medicare Coverage Database; stakeholders can submit evidence during comment periods. The 21st Century Cures Act and subsequent CMS reforms standardized the LCD development process across MACs and required public-facing transparency.
For RCM, LCDs drive medical-necessity edits at billing and claim scrubbing. Billing systems must map LCD-covered ICD-10-CM codes to the procedures they support; claim scrubbers must reject (or warn about) procedure claims with diagnosis pointers not listed in the LCD. Denials for "not reasonable and necessary" are often traceable to LCD non-compliance — either a diagnosis code not on the LCD list, documentation not supporting the LCD's clinical criteria, or frequency exceeding LCD limits. The ABN (Advance Beneficiary Notice) mechanism allows beneficiaries to accept financial responsibility for services the provider expects Medicare to deny under an LCD; without an ABN, the provider typically absorbs the denial.
Providers bill across multiple states must load and maintain LCDs for every relevant MAC jurisdiction. Large health systems use coding-content vendors (Optum, TruCode, Wolters Kluwer) to maintain LCD libraries and drive claim edits. Practices without this infrastructure often see elevated denial rates on LCD-heavy specialties like radiology, pathology, cardiology, and durable medical equipment.
Industry benchmark
Social Security Act §1862(a)(1)(A). Medicare Program Integrity Manual Chapter 13. 21st Century Cures Act §4009. CMS Medicare Coverage Database.
Worked example
Noridian (MAC for Jurisdiction F) publishes an LCD for Non-Invasive Vascular Studies. It specifies 37 covered ICD-10-CM codes (peripheral arterial disease diagnoses, venous insufficiency, etc.), frequency limits (one duplex scan per 12 months per affected extremity unless documented clinical change), and requires documentation of symptoms, physical findings, and prior conservative management. A vascular lab bills 93925 for a PAD patient with Z01.818 (screening) as the only listed diagnosis. Claim denies under LCD because Z01.818 is not on the covered-diagnosis list. Provider should have obtained ABN or used a supported medical-necessity diagnosis per documentation.
Frequently asked questions — Local Coverage Determination (LCD)
What is the difference between LCD and NCD?
NCDs are national coverage decisions issued by CMS that apply uniformly across all Medicare jurisdictions. LCDs are issued by individual MACs and apply only within that MAC's jurisdiction. NCDs control when they exist; LCDs fill gaps and add local detail.
How do LCDs affect billing?
LCDs specify covered ICD-10-CM codes, frequency limits, and documentation requirements. Billing systems load LCD data to drive medical-necessity edits. Claims with unsupported diagnoses or exceeding frequency deny. ABN workflows handle beneficiary financial responsibility for expected denials.
Can LCDs be appealed?
Yes. Individual claim denials can be appealed through the standard five-level Medicare appeal process (redetermination, reconsideration, ALJ, Council, federal court). Beneficiaries can also request reconsideration of the LCD itself through a formal process that includes public comment.
How often do LCDs change?
LCDs are reviewed periodically and revised when clinical evidence, coding updates, or utilization data warrant. Revisions are published in the CMS Medicare Coverage Database. Providers should subscribe to MAC updates to track LCD changes affecting their specialty.
Disclaimer
This glossary entry is operational reference for revenue-cycle and medical-billing professionals. It is not legal, clinical, or contractual advice. Industry benchmarks cite named public sources where available; always verify against the current guidance from the authority body before relying on a number in a contract, policy, or compliance filing.