What Physician Practices Need to Know About Temporary Coverage Billing

Temporary physician coverage, commonly referred to as “locum tenens,” has become increasingly common as practices navigate vacations, medical leave, staffing shortages, and physician recruitment gaps.

While locum arrangements can help maintain continuity of care and patient access, many physician practices underestimate the billing and compliance complexity involved.

One of the biggest misconceptions is that locum billing rules are the same across all payers.

They are not.

Medicare, Medicaid, commercial insurance plans, Workers’ Compensation carriers, and federal programs may all handle locum billing differently. Incorrect billing can lead to:

• Claim denials
• Delayed reimbursement
• Compliance concerns
• Audit exposure
• Potential fraud allegations related to improper NPI usage

Understanding the differences before submitting claims is critical.

What Is Locum Tenens Billing?

Locum tenens refers to temporary physician coverage used when a provider is unavailable due to:

• Vacation
• Illness
• Continuing medical education (CME)
• Maternity or medical leave
• Short-term staffing gaps

In some cases, payers allow services performed by a temporary physician to be billed under the absent physician’s National Provider Identifier (NPI), provided certain requirements are met.

However, these rules vary significantly depending on the payer.

Medicare Locum Tenens Rules

Medicare has some of the clearest locum tenens billing guidelines.

Under Medicare:

• Locum tenens billing is permitted in certain temporary coverage situations
• Claims are billed under the absent physician’s NPI
• Modifier Q6 must be appended to applicable claims
• The locum physician cannot bill Medicare directly for those services
• Coverage is generally limited to 60 continuous days per absence

Medicare locum tenens rules apply only to physicians (MD/DO) and generally do not apply to nurse practitioners or physician assistants.

Importantly, Medicare does not allow locum arrangements to be used for:

• Permanent staffing shortages
• Practice growth
• Long-term vacancy coverage

If temporary coverage extends beyond Medicare limits, practices may need to credential and enroll the locum provider separately.

Medicaid Rules May Vary by State

Many state Medicaid programs follow rules similar to Medicare, but requirements can differ significantly by state.

Some Medicaid programs may require:

• Separate locum enrollment
• Advance notification
• State-specific modifiers
• Additional documentation requirements

Because Medicaid policies vary, practices should verify billing rules with each state Medicaid plan before claims are submitted.

Commercial Payers Often Have Different Requirements

Commercial insurance plans may allow temporary coverage billing, but policies are often less standardized than Medicare.

Depending on the payer and duration of coverage:

• Billing under the absent physician’s NPI may be permitted temporarily
• The locum provider may need to be credentialed quickly
• The payer may require notification before billing
• Claims may need to include the locum provider’s NPI

Extended temporary coverage frequently triggers credentialing requirements.

One of the highest-risk compliance issues occurs when claims are billed under the wrong provider NPI after payer limits have expired.

Workers’ Compensation Billing Rules Can Be Highly Variable

Workers’ Compensation (WC) billing rules for locum providers are often among the most inconsistent.

Requirements may depend on:

• State Workers’ Compensation rules
• Carrier-specific policies
• Network participation requirements
• Provider enrollment status

Some Workers’ Compensation carriers may allow billing under the supervising or absent physician, while others require the rendering provider to bill directly under their own NPI.

Practices should always verify billing requirements with both the payer and applicable state guidelines before services are rendered.

Common Locum Billing Compliance Risks

Several issues commonly create compliance exposure for physician practices.

Incorrect NPI Usage

Billing under the wrong provider’s NPI can trigger audits, denials, or fraud concerns.

Exceeding Time Limits

Some payers restrict how long temporary coverage billing may continue before credentialing is required.

Missing Modifiers

For Medicare claims, modifier Q6 is required when applicable.

Lack of Documentation

Practices should maintain clear records including:

• Locum provider information
• Dates of coverage
• Payment arrangements
• Supervising physician relationships

Using Locum Coverage Improperly

Temporary coverage rules are generally intended for short-term absences—not permanent staffing solutions.

Why Practices Should Verify Rules Before Billing

Locum tenens arrangements may appear straightforward operationally, but billing requirements can quickly become complicated across multiple payers.

A workflow that is compliant under Medicare may not be compliant under:

• Medicaid
• Commercial insurance plans
• Workers’ Compensation carriers
• Federal programs such as OWCP/DOL

Practices should confirm:

• Whether locum billing is permitted
• Which NPI should be used
• Whether credentialing is required
• Applicable modifiers and documentation rules
• Time limitations for temporary coverage

Verification before claims submission can help reduce denials, repayment demands, and audit risk.

The Bottom Line for Physician Practices

Temporary physician coverage plays an important role in maintaining patient access and practice operations, but locum billing rules are not universal.

As payer scrutiny and healthcare audits continue to increase, physician practices should ensure temporary coverage arrangements are reviewed carefully from both a reimbursement and compliance perspective.

Even small billing errors involving provider enrollment or NPI usage can create larger downstream issues if not addressed early.

Need Help Navigating Provider Enrollment, Credentialing, and Billing Compliance?

Peregrine Healthcare helps physician practices manage credentialing, payer enrollment, revenue cycle operations, and reimbursement compliance across a wide range of specialties and payer environments.

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