Denial management services for hospitals and groups
Denial management is the work of finding out why a payer refused or reduced a claim, fixing it, getting paid, and stopping the same denial from coming back. We work every denial within 48 hours, read the reason and remark codes on the remittance, and file appeals inside the payer's deadline.
Written by Salman Saeed, CEO and Co-Founder · Reviewed by a Certified Medical Coder · Last reviewed October 2026
In short: a denial is revenue you already earned that a payer has not yet paid. We work every denial within 48 hours, correct and resubmit or appeal it, track each appeal level to a decision, and report the root cause so registration, coding or authorization can fix it.
What is denial management in healthcare?
Denial management is the process of capturing denied and underpaid claims, working out the cause, correcting or appealing them, and using the pattern to prevent repeats. It covers the claim after it has been sent to the payer, and it feeds back to the front end where most denials start.
A denial is a payer's decision not to pay all or part of a claim. A rejection is different: the clearinghouse or payer front end refused the claim before adjudication, so you fix and resend. We track both, because a stuck rejection becomes a timely filing denial.
Our work sits next to A/R recovery: denials are the part of accounts receivable that will not move until someone reads the reason and builds the response.
How fast should a denied claim be worked?
A denied claim should be worked within days, not at the next A/R review. Nucleus Align works denials within 48 hours.
The clock matters because every payer deadline runs from a date you do not control: the remittance date, the date you receive the notice, or the date of service. Medicare claims must be filed no later than the close of the period ending 1 calendar year after the date of service under 42 CFR 424.44.
How do you read a denial: group code, CARC and RARC?
Every denial on an ERA (the electronic remittance advice, the X12 835) carries a group code, a CARC and often a RARC. Read all three together: the group code says who owns the amount, the CARC says why it was adjusted, and the RARC adds the specific detail.
A CARC is a Claim Adjustment Reason Code, a standard X12 code explaining why a payer adjusted a line or claim. A RARC is a Remittance Advice Remark Code, which gives extra detail such as which data element was missing. X12 requires at least one remark code to accompany CARC 16 and CARC 252, so the CARC alone is never the whole story.
| Group code | X12 meaning | What it tells you |
|---|---|---|
| CO | Contractual Obligation | Provider liability. The patient cannot be billed for the amount unless a specific exception applies. |
| PR | Patient Responsibility | Deductible, coinsurance, copay or a non-covered amount the patient may owe. |
| OA | Other Adjustment | An adjustment that is neither of the above, such as an exact duplicate (CARC 18). |
| PI | Payer Initiated Reductions | A reduction the payer made on its own. |
The same CARC means different work depending on the group code. CARC 45 (charge above the fee schedule or contracted arrangement) is normally a CO contractual write-off, not a denial to appeal unless the contracted rate was applied wrongly.
What are the most common reasons for claim denials?
Most denials come from a short list of causes: missing or wrong information, modifier errors, missing authorization, medical necessity, bundling and timely filing. CO-16 means fix the data and resend, CO-97 means check bundling and modifiers, and CO-50 means appeal with records and the payer's policy. Descriptors are quoted short from the X12 code list.
| CARC | X12 descriptor (short) | Where it usually starts | First move |
|---|---|---|---|
| 16 | Claim lacks information or has submission or billing errors | Registration, charge entry | Read the RARC, correct the data, resubmit as a new or corrected claim |
| 4 | Procedure code inconsistent with the modifier used | Coding | Correct the modifier and resubmit |
| 197 | Precertification, authorization or notification absent | Scheduling, authorization | Check whether a retro authorization is allowed, then appeal with records |
| 50 | Non-covered because not deemed a medical necessity | Clinical documentation, authorization | Appeal with records and the payer's own policy |
| 97 | Benefit included in the payment for another service | Coding, modifier use | Check bundling edits, then appeal with documentation if separately reportable |
| 29 | Time limit for filing has expired | Billing workflow | Appeal with proof of timely filing, if it exists |
What are the Medicare appeal levels and their deadlines?
Original Medicare fee-for-service claims have five appeal levels: redetermination by the MAC, reconsideration by a Qualified Independent Contractor (QIC), an Administrative Law Judge (ALJ) hearing, review by the Medicare Appeals Council, and federal district court. The first deadline is 120 calendar days from receipt of the initial determination, and receipt is presumed to be 5 days after the notice date.
| Level | Who decides | File within | Decision timeframe |
|---|---|---|---|
| 1. Redetermination | MAC | 120 calendar days of receiving the initial determination (42 CFR 405.942) | 60 calendar days (405.950) |
| 2. Reconsideration | QIC | 180 calendar days of receiving the redetermination (405.962) | 60 calendar days (405.970) |
| 3. ALJ hearing | Office of Medicare Hearings and Appeals | 60 calendar days of receiving the QIC reconsideration (405.1014) | 90 calendar days (405.1016) |
| 4. Council review | Medicare Appeals Council | 60 calendar days of receiving the ALJ decision (405.1102) | 90 calendar days (405.1100) |
| 5. Federal district court | US district court | 60 calendar days of receiving the Council decision (405.1130) | Set by the court |
Each level has a dollar floor from level 3 up. For calendar year 2026, CMS set the amount in controversy at $200 for an ALJ hearing and $1,960 for judicial review, effective January 1, 2026, in its Federal Register notice of December 4, 2025. Claims can be aggregated in some cases when they share common issues of law and fact under 42 CFR 405.1006.
The QIC will not consider evidence you leave out. Under 42 CFR 405.966, failure to submit all evidence, including documentation requested in the redetermination notice, precludes later consideration absent good cause. Send the full record at level 2. Details are on our Medicare appeal levels page.
How many appeal levels do commercial payers allow?
There is no single number. Commercial payers set their own levels and deadlines in the provider contract and the payer's provider manual, and those documents control a provider dispute. Common structures are a reconsideration, then one or two formal appeals, then arbitration or external review where the contract or state law allows it.
For participants in employer group health plans covered by ERISA, the federal claims rule at 29 CFR 2560.503-1(h)(3)(i) requires the plan to give claimants at least 180 days after an adverse benefit determination to appeal. That is a floor for the member's appeal, and a provider appealing under its own contract may have a shorter window. Read the contract before relying on 180 days.
Whatever the structure, send the first appeal with the full record: remittance, medical record, authorization, the policy citation and a short letter stating the error. Calendar the payer's response time together with the next level's deadline.
Underpaid out-of-network claims follow a separate federal path under the No Surprises Act.
How do you track denial root causes back to registration, coding or authorization?
Tag every denial with the department that caused it when it is worked, not when it is reported: registration and eligibility, authorization, coding and documentation, or billing process. Counting tags by payer and reason code shows where the leak is.
| Where it started | Typical denials | Upstream fix |
|---|---|---|
| Registration and eligibility | CO-27 coverage ended, CO-16 | Eligibility verification before the visit |
| Authorization | CO-197 | Prior authorization check at scheduling |
| Coding and documentation | CO-4, CO-97, CO-50, CO-252 | Coder feedback and documentation prompts |
| Billing process | CO-29, CO-18 | Rejection queue owners and filing-limit alerts |
The denial management playbook covers the prevention work in full.
What metrics should a denial report show?
A denial report should show denial rate, recovery rate, first-pass resolution rate, days in denial and the top reasons by payer, in both claim count and dollars. Without the definitions written down, two reports will not match, so we state each formula in the report.
- Denial rate: denied claims or dollars as a share of those submitted, by payer and reason.
- First-pass resolution rate: the share of claims paid correctly on first submission, with no denial, rejection or rework.
- Recovery rate: dollars paid after rework or appeal as a share of dollars denied.
- Days in denial: time from denial to resolution.
There is no official benchmark for any of these, and published figures differ because each source defines a denial differently. We compare your rate to your own trend and your payers. Standardized definitions are published by HFMA.
Across our clients we see 15 to 20% revenue recovered from denials and old A/R. Results for any one client depend on payer mix, specialty and the state of the backlog.
How we handle denial management
Our team has billed for US practices since 2018. We work in your EHR, clearinghouse and payer portals, with a Business Associate Agreement for every client and two-step login on every system. Our team is offshore, with a registered office in Richmond, KY.
If you want to see how this would apply to your payer mix and your current denials, book a call.
- 42 CFR Part 405, Subpart I: Appeals under Medicare Parts A and B · eCFR
- 42 CFR 424.44: Time limits for filing claims · eCFR
- Medicare Parts A and B appeal amount in controversy thresholds, CY 2026 · Federal Register
- Medicare fee-for-service appeals · CMS
- Claim Adjustment Reason Codes and group codes · X12
- 29 CFR 2560.503-1: Claims procedure · eCFR
We check every rule, code and deadline against the official source. See our editorial policy.
Who we do this for
Common questions
Straight answers from the team that does the work.
Ask a billing lead directly. A 20-minute call, Monday to Friday, 9am to 5pm Eastern.
01What is denial management in healthcare?
Denial management is the process of finding denied and underpaid claims, working out why the payer refused them, correcting or appealing them, and fixing the cause so they stop recurring. It includes tracking each appeal level to a decision and reporting patterns by payer and reason code.
02What is a good denial rate for a hospital?
There is no official benchmark, and published rates differ because each source defines a denial differently. Measure your own denial rate by payer and reason in both claims and dollars, then judge it against your trend and your contracts. We define the formula in every report so the number holds up.
03What are the most common reasons for claim denials?
The most common causes are missing or wrong information (CARC 16), modifier errors (4), missing authorization (197), medical necessity (50), bundling (97) and timely filing (29). Each starts in a different department, which is why we tag every denial with its root cause when it is worked.
04How fast should a denied claim be worked?
As soon as it arrives. We work denials within 48 hours. Payer deadlines run from dates you do not control, such as the remittance date or the date of service, and Medicare requires claims within 1 calendar year of service, so delay removes options.
05What is the difference between a soft denial and a hard denial?
A soft denial can be corrected and paid, such as a missing modifier or a records request. A hard denial is a final refusal that only a successful appeal can reverse, such as a non-covered service or an expired filing limit. These are billing-office terms, not X12 or CMS categories.
06How do you decide which denials are worth appealing?
Compare the expected payment, adjusted for the chance of winning, with the cost of the work, and check the deadline. We rank by dollar value, payer, reason and time left. Repeating low-dollar denials are also worth working, because a single successful argument and an upstream fix can clear many claims.
07How do you track denial root causes back to registration, coding or authorization?
We tag each denial with the department that caused it when it is worked: registration and eligibility, authorization, coding and documentation, or billing process. Counting tags by payer and reason code shows where the leak is, and each pattern goes back to its owner with a specific fix.
08How many appeal levels do commercial payers allow?
It varies by payer and contract, so read the provider agreement and manual. Many use a reconsideration and one or two formal appeals, sometimes followed by arbitration or external review. For ERISA group plans, 29 CFR 2560.503-1 gives members at least 180 days to appeal.
09How does CO-16 differ from CO-97 and CO-50?
CO-16 means the claim lacks information or has a billing error, so you correct and resend. CO-97 means the payer treats the service as included in another service's payment, so a coder checks bundling and modifiers. CO-50 means the payer found no medical necessity, so you appeal with records and policy.
10Can you work our old denial backlog?
Yes. We sort it by remaining appeal deadline and dollar value, work the items still inside their window first, and tell you early which ones are no longer recoverable. Medicare's first-level window is 120 calendar days from receipt, with extensions only for good cause.
11What metrics should a denial report show?
Denial rate, recovery rate, first-pass resolution rate, days in denial and the top reason codes by payer, in claims and dollars. Each formula should be written in the report. We tag each reason with the upstream owner so the report points to action, not just totals.
12What percent of denials get overturned when appealed?
No official overturn rate exists for us to cite, so we quote none. Results depend on the payer, the reason and the quality of the record. A denial that can be disproved from the chart, such as an authorization number or a timestamp, is far stronger than one that cannot.
Talk to a billing lead.
A 20-minute call about your payers, volume and setup. Monday to Friday, 9am to 5pm Eastern.