Glossary · Compliance

National Government Services (NGS)

National Government Services (NGS) is a Medicare Administrative Contractor (MAC) that processes Part A and Part B Medicare claims for providers in Jurisdictions 6 and 8, covering states across the Midwest and Northeast. It is the authoritative local payer for coverage determinations, claims adjudication, and audit activity in those jurisdictions.

Verified May 8, 2026 · 6 sources ↓

Drawn from CMSAAOSCgsmedicare

Definition

Source · Editorial summary grounded in 6 cited references ↓

National Government Services (NGS) is one of the regional Medicare Administrative Contractors (MACs) operating under contract with the Centers for Medicare & Medicaid Services (CMS). MACs serve as the frontline administrative interface between CMS and providers, handling claims processing, payment, appeals, provider enrollment, and the issuance of Local Coverage Determinations (LCDs). NGS specifically administers Medicare Part A and Part B for Jurisdiction 6 (Illinois, Minnesota, Wisconsin) and Jurisdiction 8 (Indiana, Michigan), making it the controlling payer authority for orthopedic practices and facilities located in those states.

For orthopedic surgeons and coders, NGS is operationally significant because it publishes and enforces LCDs that govern whether specific procedures—such as arthroscopic debridement, spinal injections, or joint replacement—meet Medicare coverage criteria in its jurisdiction. These LCDs can differ meaningfully from those issued by other MACs, so a coverage policy that permits a service in one jurisdiction may deny it under NGS. NGS also conducts pre-payment and post-payment audits, issues Additional Documentation Requests (ADRs), and manages the first two levels of the Medicare appeals process (redetermination and reconsideration).

Because NGS applies NCCI edits alongside its own LCD and coverage policies, orthopedic practices billing in Jurisdictions 6 or 8 must monitor NGS-specific guidance in addition to national CMS rules. NGS publishes provider education articles, billing guides, and LCD updates on its own website, which serve as binding local policy until superseded by CMS national instruction.

Why it matters

Billing an orthopedic procedure without confirming the active NGS LCD for that service is a direct path to denial or post-payment recoupment. NGS LCDs specify diagnosis codes that support medical necessity, required documentation elements, and frequency limitations that are stricter than—or simply different from—national defaults. A claim for arthroscopic knee surgery that satisfies NCCI edits and national coverage rules can still be denied by NGS if the submitted ICD-10-CM code is not on the LCD's covered-diagnosis list. Practices that ignore jurisdiction-specific guidance face not only claim denials but potential inclusion in targeted probe-and-educate audits, which can escalate to full extrapolation recovery demands.

Common mistakes

Where people most often go wrong with this concept.

Source · Editorial brief grounded in cited references ↓

Applying another MAC's LCD (e.g., Noridian or Novitas) to NGS-jurisdiction claims and assuming coverage criteria are identical.
Failing to monitor NGS contractor website for LCD revisions and billing article updates between annual CPT code cycle changes.
Submitting an appeal to the wrong level or wrong address—NGS handles redeterminations and qualified independent contractor (QIC) reconsiderations follow a separate path not managed by NGS.
Treating an NGS Additional Documentation Request (ADR) as optional or low-priority, missing the response deadline and triggering automatic denial.
Assuming that CMS national coverage determinations (NCDs) override all NGS LCDs without checking whether NGS has a more restrictive local policy in place alongside the NCD.
Overlooking NGS-specific ICD-10-CM covered-diagnosis lists when the treating provider documents a diagnosis that is clinically appropriate but not enumerated on the relevant LCD.

Related codes

Codes commonly involved when this concept appears in practice.

CPT

ICD-10

M17.11 M51.16

Modifiers

59 Distinct procedural service KX Medical-policy requirements met 76 Repeat procedure same physician

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 6 cited references ↓

01How do I know if NGS is my Medicare Administrative Contractor?

Your MAC is determined by the state in which your practice is enrolled with Medicare. NGS covers Jurisdiction 6 (Illinois, Minnesota, Wisconsin) and Jurisdiction 8 (Indiana, Michigan). If your billing address falls in one of those states, NGS adjudicates your Medicare Part B professional claims.

02Does an NGS LCD override a CMS National Coverage Determination?

No. A CMS National Coverage Determination (NCD) takes precedence over any MAC's LCD. However, when no NCD exists for a procedure, the NGS LCD is controlling for providers in Jurisdictions 6 and 8 and must be followed to establish medical necessity.

03Where do I find current NGS LCDs for orthopedic procedures?

Current NGS LCDs are published on the CMS Coverage Database (cms.gov/medicare-coverage-database) and mirrored on the NGS provider website. Always pull the LCD directly from those sources rather than relying on third-party summaries, because effective dates and covered-diagnosis lists change with ICD-10-CM annual updates each October.

04What happens if NGS sends an Additional Documentation Request and I miss the deadline?

If you do not respond to an ADR within the specified timeframe (typically 45 days), NGS will issue an automatic denial based on insufficient documentation. You would then need to pursue a redetermination appeal, which extends the resolution timeline and adds administrative burden. Responding promptly with complete medical records is always preferable.

05Can NGS conduct a post-payment audit even after a claim is paid?

Yes. NGS can reopen and review paid claims through post-payment audits, including Targeted Probe and Educate (TPE) reviews. If documentation does not support the billed service, NGS can demand repayment through an overpayment letter, potentially extrapolated across a broader sample of similar claims.

Sources & references

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

Mira AI Scribe

When Mira detects that the rendering or billing provider is enrolled in Medicare Jurisdiction 6 (IL, MN, WI) or Jurisdiction 8 (IN, MI), it activates NGS-specific LCD cross-checks during code selection and documentation review. Concretely, this means: 1. ICD-10-CM code validation: Mira flags any primary diagnosis that does not appear on the NGS LCD's covered-diagnosis list for the selected CPT code, prompting the provider to either select a more specific covered code or add supporting documentation before submission. 2. Modifier suggestions: When an NGS LCD requires an Advance Beneficiary Notice (ABN) for a non-covered indication, Mira surfaces modifier GA or GY at the claim-build stage rather than after denial. 3. Documentation gap alerts: NGS LCDs for procedures such as arthroscopic debridement and spinal cord stimulation require specific clinical findings in the record. Mira's documentation layer checks for required elements (e.g., failure of conservative therapy, imaging findings) and flags missing language for provider attestation before the note is finalized. 4. ADR readiness: Mira tags NGS-jurisdiction claims with high audit-risk CPT codes (based on NGS probe-and-educate target lists) and retains structured documentation links to support rapid ADR response within the 45-day window. Providers outside Jurisdictions 6 and 8 will not see NGS-specific prompts; Mira routes LCD logic to the appropriate MAC for the enrolled billing location.

See Mira's approach

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.

Local Coverage Determination (LCD) Compliance

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.

National Coverage Determination (NCD) Compliance

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.

Redetermination (Medicare appeal level 1) Billing

A redetermination is the first of five Medicare appeal levels, in which a Medicare Administrative Contractor (MAC) conducts a fresh review of a denied or partially paid claim; the request must be filed within 120 days of receiving the initial determination notice.

Prior authorization Billing

Prior authorization (PA) is a payer requirement that a provider obtain approval before delivering a specific service, procedure, or item—otherwise the claim will be denied regardless of medical necessity. Approval is granted when submitted clinical documentation meets the payer's coverage criteria.