Glossary · Compliance

Local Coverage Determination (LCD)

A Local Coverage Determination (LCD) is a regional Medicare policy issued by a Medicare Administrative Contractor (MAC) that defines when a specific service, procedure, or supply is considered reasonable and medically necessary within that contractor's jurisdiction.

Verified May 8, 2026 · 9 sources ↓

Drawn from CMSAAPCNoridianWPS GHAPchhealth

Definition

Source · Editorial summary grounded in 9 cited references ↓

LCDs are created by the twelve MACs that administer Medicare claims across the United States. Because each MAC governs a defined geographic jurisdiction, an LCD applies only within that region—meaning a spinal cord stimulator implant or a custom orthotic device may be covered under specific diagnostic criteria in one state but face different documentation requirements or outright non-coverage in another. Each LCD establishes the covered indications, lists the applicable ICD-10-CM diagnosis codes, and cross-references the associated Billing and Coding Article where CPT and HCPCS Level II codes are published (a structural change mandated by the 21st Century Cures Act).

LCDs sit one tier below National Coverage Determinations (NCDs), which CMS issues at the federal level and which override any conflicting LCD. When no NCD exists for a service, the governing MAC fills the gap with an LCD. MACs are required to revise an LCD within 90 days of a new or revised NCD or manual update, and within 120 days of HCPCS or ICD-10 code set changes. LCDs go through a formal development cycle that includes a proposed LCD phase, a public comment period, open contractor advisory committee meetings, and a final publication with an effective date—all trackable in the CMS Medicare Coverage Database (MCD).

For orthopedic practices, LCDs govern high-volume services including total joint replacement, spinal surgery, durable medical equipment (DME) such as knee and ankle orthoses, and orthopedic footwear (e.g., LCD L33641 administered by CGS Administrators and Noridian Healthcare Solutions across all four DME MAC jurisdictions). The coverage criteria embedded in each LCD directly control whether a claim will adjudicate or deny on first submission.

Why it matters

Ignoring or misreading the applicable LCD is one of the fastest paths to a preventable denial or a post-payment audit finding. If a provider documents a diagnosis that does not appear on the LCD's covered ICD-10 list—even when the clinical rationale is sound—the claim will likely deny as not medically necessary and any collected payment becomes subject to recoupment. Because LCDs vary by jurisdiction, a multi-site orthopedic group billing under two different MACs must maintain two separate compliance workflows; a coverage rule that clears claims in one region may trigger automatic denial in another. Correctly mapping the patient's documented diagnosis to the LCD's covered indications before the claim drops is the single most effective way to protect first-pass acceptance rates and reduce audit exposure.

Common mistakes

Where people most often go wrong with this concept.

Source · Editorial brief grounded in cited references ↓

Using the NCD as the only reference when an LCD exists for the same service—LCDs frequently impose stricter or more specific indications than the NCD.
Looking for CPT and HCPCS codes inside the LCD document itself after the 21st Century Cures Act conversion; those codes now live in the separate Billing and Coding Article linked in the LCD's Associated Documents section.
Applying one jurisdiction's LCD to patients billed under a different MAC—coverage criteria, covered ICD-10 codes, and documentation requirements can differ significantly across jurisdictions.
Treating a proposed LCD as final policy and updating workflows before the effective date is published.
Failing to update diagnosis-to-procedure crosswalks within 120 days of an ICD-10 code set update, which can silently break previously compliant claim templates.
Documenting only a generic diagnosis (e.g., 'knee pain') without the specificity required by the LCD's covered ICD-10 list, triggering a medical necessity denial even when the procedure is clinically appropriate.

Related codes

Codes commonly involved when this concept appears in practice.

CPT

ICD-10

M17.11 M17.12 M16.11 M54.51

Modifiers

KX Medical-policy requirements met

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 9 cited references ↓

01Where can I find the LCD that applies to my patient?

Search the CMS Medicare Coverage Database (MCD) at cms.gov/medicare-coverage-database by service type or HCPCS/CPT code, then filter by the MAC jurisdiction that corresponds to the patient's state. Each MAC also publishes its active LCDs on its own website.

02Does an LCD apply to all payers or only Medicare?

LCDs are Medicare-specific policies issued by MACs. Commercial payers and Medicaid agencies have their own coverage policies and are not bound by LCD criteria, though some payers reference LCDs informally when developing their own medical necessity guidelines.

03What happens if my patient's diagnosis is not on the LCD's covered ICD-10 list?

Medicare will likely deny the claim as not medically necessary. If you believe the service is still clinically warranted, you should issue an Advance Beneficiary Notice of Noncoverage (ABN) before providing the service so the patient can choose to proceed and accept financial responsibility. Append modifier GA to the claim to indicate an ABN is on file.

04Can an LCD be more restrictive than an NCD?

An LCD cannot contradict an NCD, but it can add more specific criteria—for example, requiring documented failure of conservative treatment before approving a surgical procedure that an NCD covers in broader terms.

05How often are LCDs updated, and how will I know?

MACs must revise affected LCDs within 90 days of a new or revised NCD or manual update and within 120 days of HCPCS or ICD-10 code changes. Subscribing to your MAC's listserv and monitoring the MCD for proposed and revised LCDs is the most reliable way to stay current.

06Why don't LCDs list CPT codes anymore?

The 21st Century Cures Act required MACs to move procedure and diagnosis code lists out of LCDs and into separate Billing and Coding Articles. The LCD itself now contains the coverage rationale and indications; the linked article contains the specific codes. Both documents must be read together.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira's documentation layer actively cross-references the operative note and encounter diagnosis against the applicable MAC jurisdiction's LCD before the claim is finalized. Specifically, Mira: (1) maps each documented ICD-10-CM code to the LCD's covered-indications list and flags any diagnosis that falls outside covered criteria; (2) checks that the specificity of the documented diagnosis meets the LCD's requirements—for example, distinguishing laterality and primary versus secondary osteoarthritis for total joint claims; (3) alerts the coder when the selected CPT or HCPCS code appears in the Billing and Coding Article as requiring additional documentation (e.g., conservative-treatment failure attestation for spinal surgery LCDs); (4) appends a modifier suggestion (e.g., KX to affirm LCD criteria are met, or GA to indicate an ABN is on file) when the documented indications are borderline or when coverage is conditional; and (5) identifies when no LCD exists in the patient's jurisdiction and routes the claim to the general medical necessity standard instead. When Mira detects a potential mismatch between the documented diagnosis and the LCD's covered ICD-10 list, it surfaces the conflict as a pre-bill edit with a plain-language explanation and a direct link to the relevant LCD in the CMS Medicare Coverage Database so the provider can either clarify documentation or issue an ABN before claim submission.

See Mira's approach

A National Coverage Determination (NCD) is a formal, evidence-based ruling issued by CMS that establishes whether Medicare will cover a specific item or service across all Medicare contractors nationwide. NCDs are binding on every Medicare Administrative Contractor and supersede any conflicting local policy.

Medicare Administrative Contractor (MAC) Compliance

A Medicare Administrative Contractor (MAC) is a private insurance company under contract with CMS to process and pay Medicare Part A and Part B fee-for-service claims within an assigned geographic jurisdiction. MACs are the primary point of contact for providers on coverage policies, claims adjudication, and local coverage determinations.

Medical necessity Compliance

Medical necessity is the standard requiring that a service or item be reasonable and appropriate for diagnosing or treating a patient's condition according to accepted clinical practice. Payers—including Medicare—use this standard to determine whether a claim will be covered and paid.

HCPCS Level II Coding

HCPCS Level II is the CMS-maintained alphanumeric code set used to bill products, supplies, and services—such as DME, orthotics, prosthetics, and injectable drugs—that CPT codes do not adequately describe. Each code consists of one letter (A–V) followed by four digits.

ICD-10-CM Coding

ICD-10-CM (International Classification of Diseases, Tenth Revision, Clinical Modification) is the U.S. diagnosis coding system used on every claim to communicate why a service was performed, establish medical necessity, and support reimbursement. Maintained by CMS and CDC, it has been required for all HIPAA-covered entities since October 1, 2015.