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How to Reduce Claim Denials in a Medical Practice

By Dynamic Medical Billing Solutions · Updated October 13, 2026 · 6 min read

High denial rates quietly drain cash flow. Many practices only notice the problem when A/R ages past 90 days or when monthly collections drop without a clear reason. The good news: most denials are preventable, and a handful of repeat causes usually account for the majority of them.

What Counts as a Denial, and How to Measure Yours

A denial is a claim a payer has processed and refused to pay, in whole or in part. It is different from a rejection, which is a claim that never made it into the payer's system because of a formatting or data error (for example a missing subscriber ID). Rejections are fixed and resubmitted. Denials have to be corrected, appealed or written off, and each one costs staff time.

Before you can reduce denials you need a baseline. Track three numbers every month:

• Initial denial rate = claims denied on first submission ÷ claims submitted. Many industry sources treat roughly 5–10% as typical and under 5% as a good goal, though the right target varies by specialty and payer mix.
• First-pass resolution rate = claims paid correctly on first submission ÷ claims submitted. This is the flip side of the denial rate and is the cleanest measure of billing quality.
• Denial write-off rate = dollars written off because of denials ÷ total charges. This shows how many denials are never recovered.

Pull the numbers by payer, by provider and by denial reason. An overall rate of 7% can hide one payer at 20% or one front-desk workflow that causes half the problems.

The Most Common Denial Reasons

Payers explain denials with Claim Adjustment Reason Codes (CARCs) and Remittance Advice Remark Codes (RARCs) on the remittance. Learning the handful you see most often turns a pile of EOBs into a to-do list.

• Eligibility and coverage — the patient was not covered on the date of service, the policy termed, or the plan does not cover the service. Coordination of benefits problems (CO-22, CO-109) fall here too.
• Missing or invalid authorization — prior authorization or referral was not obtained, expired, or was for a different CPT code or provider (commonly CO-197).
• Coding and modifier errors — mismatched CPT and ICD-10 codes (CO-11), missing or incorrect modifiers (CO-4), unbundled services that NCCI edits combine (CO-97), and outdated or deleted codes.
• Medical necessity — the diagnosis on the claim does not support the service under the payer's policy (CO-50), or the note does not back it up.
• Timely filing — the claim reached the payer after its filing limit (CO-29). Limits range from 90 days to a year or more depending on the payer and contract.
• Duplicate claims (CO-18) — often caused by resubmitting a claim that was simply still in process.
• Missing information (CO-16) — referring provider NPI, taxonomy, place of service, or other required fields left blank.

Note that not every adjustment is a denial. Contractual write-downs (CO-45) and patient responsibility amounts (PR-1 deductible, PR-2 coinsurance, PR-3 copay) are expected and should not be counted in your denial rate.

Fix It at the Front End: Registration and Eligibility

Industry experience consistently shows that a large share of denials start before the patient is seen. The front desk is the cheapest place to prevent them.

1. Verify eligibility before every visit, not only for new patients. Coverage changes in January, with job changes and at renewal. Run eligibility 48–72 hours ahead where your system allows it.
2. Capture complete demographics. Scan the front and back of the insurance card and photo ID at every visit. Name spelling, date of birth and subscriber ID mismatches are one of the most avoidable causes of rejection.
3. Identify the primary and secondary payer. Ask about auto or workers' compensation involvement, and about Medicare Secondary Payer questions for patients over 65 who are still working.
4. Handle authorization and referrals at scheduling, not at check-in. Record the authorization number, approved codes, visit count and expiry date in the chart where the biller can see it.
5. Collect copays and known balances at the time of service. This is a revenue issue rather than a denial issue, but it often shows up in the same A/R report.

Fix It in the Middle: Charge Capture, Coding and Documentation

The clinical note is the legal and financial basis of the claim. If the note does not support the code, the claim is at risk, whether it is denied now or recouped in an audit later.

• Charge-capture checklist. Build a simple list of procedures, injections, supplies and add-on codes per specialty so nothing is left off the claim. Missed charges are silent revenue loss: no denial, but no payment either.
• Coder–provider feedback loop. When documentation is thin, the coder needs a fast way to query the provider, and the provider needs to see the pattern. A monthly 20-minute review of the top documentation gaps pays for itself.
• Use a claim scrubber. A good scrubber catches NCCI edits, modifier conflicts, missing fields and payer-specific rules before the claim leaves your office. Review the scrubber's edit list too; a rule that is disabled or ignored does nothing.
• Stay current on code changes. CPT and ICD-10-CM update every year, and payers publish their own policy changes throughout it. Assign one person to track updates and brief the team.

If you suspect your coding is the weak link, an independent medical billing audit of a sample of charts will show error patterns faster than guessing.

Fix It at the Back End: Work Every Denial, Fast

Even with good front-end processes, some denials will happen. What separates strong practices is how quickly and systematically they work them.

1. Post denials the day the remittance arrives and assign each one a reason category (eligibility, authorization, coding, medical necessity, timely filing, other).
2. Work the oldest and largest first, but set a rule that nothing sits unworked for more than a few days. Appeal deadlines are usually 60–180 days from the denial date, and some are shorter.
3. Correct and resubmit when the cause is a clerical error; appeal when the payer has made a judgment you disagree with.
4. Keep a denial log with payer, code, reason, amount, root cause and outcome. This log is the most useful improvement tool you will have.

For practices that do not have the capacity to chase every claim, dedicated denial management and A/R recovery support exists for exactly this reason.

How to Write an Appeal That Gets Paid

Appeals are won on specifics. A generic "please reconsider" letter rarely works. A strong appeal usually includes:

• The patient, claim number, date of service and the exact denial reason code.
• One or two sentences stating why the denial is wrong, tied to the payer's own policy or to a specific coding guideline.
• Supporting documentation: the relevant progress note, test results, the authorization number or proof of timely filing (a clearinghouse acceptance report).
• The requested action — reprocess and pay at the contracted rate — and the date you are writing.

Submit through the payer's portal when possible so you have a timestamp, and follow up on a fixed schedule. Track appeal success rates by payer: if one payer overturns most of your appeals, it is worth knowing that the first denial was probably wrong.

A Simple Monthly Denial Review

Set aside an hour each month for the practice manager, a coder and a biller to review the following:

Metric	Why it matters
Top 10 denial reasons by count and by dollars	Shows where to fix the process first.
Denial rate by payer	Finds payer-specific rules your team is missing.
Denial rate by provider or location	Finds documentation or workflow gaps.
Appeal overturn rate	Shows whether appeal effort is paying off.
Days in A/R and A/R over 90 days	Shows the cash impact. See our guide to reducing days in A/R.

For each of the top three reasons, write down the root cause and one process change, assign an owner and check the result the next month. This is slow, boring work, and it is what lowers denial rates.

When Outside Help Makes Sense

If your denial rate stays above roughly 5–8% after internal fixes, if the same reasons keep repeating, or if your team is too stretched to work denials within a few days, coding expertise or follow-up capacity is usually the bottleneck. Before changing staff or outsourcing everything, a structured audit can show exactly where revenue is leaking. If outsourcing is on the table, our comparison of in-house vs outsourced billing covers the cost and risk factors.