Denials & A/R resources
Guides for reducing claim denials, recovering aged accounts receivable, and improving clean claim rates so your practice gets paid faster.
Start with what you are trying to do
Four different problems land on this page. A denial pattern that repeats every month, a legacy backlog nobody is working, current claims that are simply moving too slowly, and a one-off question about a single code are not the same job and are not scoped the same way.
- The same denials keep coming back every month Recurring work: each denial coded to its CARC/RARC root cause, appeals filed inside that payer’s own deadline, and the upstream fix so the same reason stops recurring. It sits inside the percentage-of-collections rate rather than being billed per appeal. Denial management service
- There is an aged A/R backlog nobody is working A one-time project on the legacy ledger — balances stranded in an old practice-management system, denials that were never appealed, underpayments nobody calculated — scoped separately from day-to-day follow-up on current claims. A/R recovery project
- Current claims are moving, just too slowly The recurring counterpart to a recovery project: a weekly insurance worklist ranked by filing deadline, escalation past payer stalls, and appeals filed before claims expire. A/R follow-up service
- I only need to know what one code means A CARC and RARC lookup you can use without talking to anyone: the business situation behind each code in our own wording, what it takes to clear it, and which codes carry no appeal rights at all. Free, and no form in front of it. Denial code lookup
Every Denials & A/R guide, A to Z
97 Denial Code Explained: What It Means and How to Fix It
CARC 97 means the service is bundled into another procedure. Learn what triggers it (NCCI PTP edits), the modifier 59/X-modifier fix, and when to appeal.
Read the GuideA/R Aging Report in Medical Billing: How to Read It and Work Every Bucket (2026)
An A/R aging report sorts unpaid claims by 0-30, 31-60, 61-90, 91-120, 120+ days. Target under 25% of A/R over 90. Bucket table, worked example, playbook.
Read the GuideAppeal Letter Template for Medical Billing (with Examples)
How to write a medical billing appeal letter: what the payer requires versus recommended structure, three templates by denial type (CARC 50, 197, 97), and the Medicare appeal levels and deadlines.
Read the GuideB7 Denial Code: Provider Not Certified for This Service — How to Fix It (2026)
B7 means the provider wasn't certified/eligible to be paid for this service on this DOS. Causes, the PECOS/credentialing fix, and a B7 vs CO-185 vs CO-8 table.
Read the GuideBCBS Denial Codes List: BlueCard, Prefixes & How to Fix Each (2026)
BCBS denial codes map to standard X12 CARC/RARC values. Decoder tables for common Blue Cross Blue Shield denials, BlueCard routing, and the alpha-prefix fix.
Read the GuideCARC and RARC Codes: Denial Codes Reference
CARC and RARC reference: what each listed code means in plain language, its X12 status, the operational fix, and when a PR code may be billed.
Read the GuideCardiology Denial Cheat Sheet: Top CARC Codes, Causes, Fixes, and Appeal Angles
The top cardiology billing denials by CARC code — cath-lab bundling (97/236), stress-test supervision, echo downcoding, prior auth (197) — each with the fix and appeal angle.
Read the GuideClean Claim Rate Formula and Measurement (2026)
How to calculate clean claim rate on one measurement event and one denominator, why no free primary source publishes a target, and the nine levers that move it.
Read the GuideClearinghouse Rejection vs Payer Denial: The Critical Distinction
Why a rejection is not a denial, which layer produced it, what Medicare says about appeal rights on returned claims, and how the 277CA tells them apart.
Read the GuideCO-129 Denial Code: What It Means and How to Fix It (2026)
CO-129 means prior processing info appears incorrect — usually a corrected claim filed without frequency code 7 or the right original claim number. The fix.
Read the GuideCO-16 Denial Code: What It Means and How to Fix It (2026)
CO-16 means the claim lacks information needed for adjudication. The fix lives in the paired RARC. Decoder table for N822, M51, N290, N382 and how to fix each.
Read the GuideCO-22 Denial Code: Coordination of Benefits — How to Fix It
CO-22 means care may be covered by another payer per coordination of benefits. Learn the COB-order causes, the bill-primary-first fix, and the appeal steps.
Read the GuideCO-236 Denial Code: NCCI Compatibility Meaning & How to Fix It
CO-236 means a procedure/modifier combo is not NCCI-compatible. Learn the Modifier Indicator 0/1/9 fix, when to add modifier 59/X, and when to write off.
Read the GuideCO-29 Denial Reason: Timely Filing Limit Expired — How to Fix It
CO-29 denial reason: the time limit for filing has expired. See timely filing limits by payer, appeal-winning exceptions, and a copy-paste appeal template.
Read the GuideCO-A1 Denial Code: What It Means and How to Fix It (2026)
CO-A1 means the claim/service is denied and at least one Remark Code must be provided. The real reason lives in the paired RARC. Decoder table + fix workflow.
Read the GuideDays in A/R: Formula, Benchmark, and How to Reduce It
Days in A/R benchmark: AAFP says stay below 50 days, 30–40 preferable. Get the formula, how to read your aging buckets, and the 4 levers that lower it.
Read the GuideDenial Management in Healthcare: Complete Guide with CARC Code Reference
Denial management, worked from primary sources: the rejection-versus-denial line Medicare draws, 25 CARC codes with corrected meanings, the six-step workflow, and the appeal clocks in the CFR.
Read the GuideDenial Rate by Specialty (2026): What Actually Drives Denials in Each One
The only free specialty-group denial rates we found are MGMA's 2019-2020 figures. What drives denials in each specialty, with CMS and eCFR citations.
Read the GuideDermatology Billing Benchmarks (2026): KPIs, Denial Rates & Targets
Dermatology billing benchmarks for 2026: the freely published physician-practice figures, the ones that do not exist, and the top derm CARC denials and fixes.
Read the GuideHow to Improve Clean Claim Rate
Fix claims before submission, not after denial: the front-end, scrubbing and feedback disciplines that raise acceptance into adjudication — with owners and a 30/60/90 plan.
Read the GuideHow to Recover Aged A/R
Aged A/R is a triage problem, not an age problem. How to sort legacy claims by filing deadline, appeal rights, denial cause, balance and cost to work — and what to write off.
Read the GuideHow to Reduce Claim Denials
Five disciplines that prevent claim denials: eligibility, prior auth, coding, scrubbing and weekly root-cause review — plus how to measure your own baseline.
Read the GuideMedical Billing Denial Benchmarks 2026: The Evidence Ledger
MGMA puts first-submission denials at 7% to 8%; AAFP calls 5% to 10% average. HFMA's formulas, plus hospital and payer-side rates with sources.
Read the GuideMental Health Billing Denials Cheat Sheet: CARC Codes, Causes, Fixes, and Appeal Angles
The top mental health billing denials in one reference: CARC code, plain-English cause, code/modifier context, the operational fix, and the appeal angle for each.
Read the GuideN822 & N823 Remark Codes: Missing or Invalid Modifier — How to Fix
N822 means a missing procedure modifier; N823 means an invalid one. Learn the CO-16 + N822 fix, the modifier-by-specialty triggers, and how to resubmit.
Read the GuideNet Collection Rate vs Gross Collection Rate: The Real Difference
Why gross collection rate misleads, what net collection rate actually measures, both formulas, the one published target with a real source, and how to compute it.
Read the GuideOrthopedic Denial Cheat Sheet: Top CARC Codes, Causes, Fixes and Appeal Angles (2026)
The top orthopedic billing denials by CARC code - global-period 97, prior-auth 197, NCCI 236, info-missing 16 - each with the cause, the correct modifier, the fix and the appeal angle.
Read the GuidePhysical Therapy Denial Cheat Sheet: Top PT Denials by CARC Code, Cause, Fix, and Appeal Angle
The top physical therapy billing denials by CARC code — 97140+97530 bundling (CARC 97/236), missing GP/KX modifiers, auth gaps (197) — with the fix and appeal angle for each.
Read the GuidePR-1, PR-2, PR-3 Patient Responsibility Codes: Deductible, Coinsurance & Copay Explained
PR-1 = deductible, PR-2 = coinsurance, PR-3 = copay. What each means, when to bill the patient, and when NOT. Side-by-side table plus the statement workflow.
Read the GuidePR-227 Denial Code: What It Means and How to Fix It (2026)
PR-227 means info the payer requested from the patient wasn't provided. COB and other-insurance causes, how to get them to respond, plus PR-31 vs CO-16.
Read the GuidePR-27 Denial Code: Expenses After Coverage Terminated — How to Fix It
PR-27 is the CARC for a service billed after the plan's coverage ended. Causes, the re-verify-and-rebill fix, PR-27 vs PR-26 vs CO-27, and an appeal template.
Read the GuidePR-31 Denial Code: Patient Cannot Be Identified as Our Insured — How to Fix It
PR-31 / CARC 31 means the patient cannot be identified as the payer's insured. Learn the causes (wrong member ID, name mismatch, wrong payer) and the fix.
Read the GuidePR-95 Denial Code: Plan Procedures Not Followed — How to Fix It
PR-95 means a required plan step was missed: no referral, no prior auth, or out-of-network. The fix, retro-auth, and when you can bill the patient.
Read the GuideUrgent Care Denial Cheat Sheet: CARC 4, 97, 16, 197 and 45 Causes, Fixes and Appeal Angles
The CARC codes to check first on an urgent care denial: POS 20 vs 11, modifier 25 on bundled E/M, S-code routing and auth, with the fix and appeal angle.
Read the GuideWhat Is A/R in Medical Billing? Days in A/R, Aging Buckets, and How to Manage Them
A/R in medical billing explained: the days-in-A/R calculation, aging buckets (0-30, 31-60, 61-90, 90+), the AAFP target and what no free source publishes.
Read the GuideFree Billing Audit · No obligation
Not sure whether it is a denial problem or an A/R problem?
Send the specialty, the payers and what the aging report looks like. We will come back on which of the two it actually is before quoting any scope. Written findings in 3-5 business days.
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