How Often Should a Practice Run a Medical Coding Audit?

Most practices should run a medical coding audit quarterly or semi-annually, with additional audits triggered by events like onboarding new providers, rising denial rates, or implementing new code sets. MB Claims recommends setting a regular schedule and selecting a representative sample of claims to spot documentation gaps and coding errors before payers flag them.

What triggers an extra coding audit?

An extra coding audit is triggered by new providers joining the practice, a spike in denials or downcoding, adoption of new procedure codes, feedback from a payer prepayment review, or a compliance concern flagged by staff.

Other triggers include:

• Payer audit notification or prepayment review letter
• EHR migration or charge-capture workflow changes
• Addition of a new specialty or service line
• Regulatory updates (for example, annual CPT or ICD-10 changes)

Waiting for denials to accumulate before auditing costs more than catching errors early. Treat these events as automatic audit checkpoints in your compliance calendar.

How large should an audit sample be?

A statistically meaningful sample typically includes a representative subset of charts per provider or per high-volume procedure code, stratified by payer mix and service type to capture variation in documentation and coding patterns across the practice.

For internal audits, smaller monthly samples identify trends before they become systemic issues. For formal compliance audits, rotate providers and CPT families each quarter to ensure every clinician and service line is reviewed within a year.

If your practice has fewer encounters per month, audit a fixed percentage rather than a fixed count. Document your sampling method and rotate focus areas so coverage remains consistent. This approach builds defensible records for payer or regulatory inquiries.

Who should review audit findings?

Audit findings should be reviewed by the practice manager, billing lead, and the providers whose charts were sampled, with action items documented and re-audit dates scheduled to confirm corrective steps were implemented.

Include your coding staff in the debrief so they understand patterns—for example, missing modifiers, under-documented medical necessity, or mismatched diagnosis codes. If the audit uncovers systemic issues, loop in your compliance officer or outside consultant.

Distribute a one-page summary highlighting:

• Error rate by category (E/M level, procedure code, modifier use)
• Documentation gaps (chief complaint, time, medical decision-making)
• Training recommendations
• Timeline for follow-up audit

Tracking these reviews in a shared log builds an audit trail for payer or regulatory inquiries.

What does a coding audit checklist cover?

A coding audit checklist verifies that the level of service matches documentation, diagnosis codes support medical necessity, modifiers are used correctly, and charge capture aligns with the visit note and any procedures performed.

Core checklist items:

For behavioral health, also review time documentation for psychotherapy codes and medical necessity narratives for higher-acuity diagnoses.

How MB Claims handles this

MB Claims provides medical billing, medical coding, provider credentialing, denial management, and revenue cycle management for US physician practices and clinics. The company integrates documentation review into the charge-posting workflow, flagging common coding patterns that may attract payer scrutiny before claims are submitted.

When coding compliance is a priority, practices can request a free medical billing A/R audit at https://www.mbclaims.com/free-medical-billing-audit/ or email hello@mbclaims.com. A written review is delivered within days of receiving summary reports, with no patient data required.

MB Claims signs a BAA with every client and delivers remote medical billing services that flag documentation gaps, modifier misuse, and E/M level mismatches during charge entry. This real-time review reduces exposure to payer audits and streamlines internal compliance workflows by catching issues before they result in denials or overpayments.

Frequently asked questions

Should audits focus on all payers or just Medicare?

Focus on all payers. Commercial plans and Medicaid also conduct prepayment and post-payment reviews, and documentation standards overlap. Rotate payer mix in each sample.

Can a medical assistant or biller perform the audit?

A trained biller or certified coder can perform internal audits. For compliance or high-risk specialties, consider an external certified professional coder or auditor for objectivity.

What happens if the audit finds a high error rate?

Document corrective action, retrain staff, and update templates. Run a follow-up audit after implementing changes to confirm improvement. If errors resulted in overpayments, consult your compliance advisor about voluntary refund protocols.

Do coding audits prevent all denials?

No. Audits catch documentation and coding errors before submission, but denials also stem from eligibility, authorization, timely filing, and payer-specific rules. Pair audits with denial tracking.

How should audit results be stored?

Store audit reports in a secure, HIPAA-compliant location with restricted access. Retain for at least six years to demonstrate compliance history during payer or regulatory inquiries.

MB Claims · www.mbclaims.com

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