How Community-Based Organizations Can Reduce Medicaid & MCO Claim Denials

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The popularity of Medicaid and MCO services is rising in the United States, with prior authorization requests increasing year over year. In 2024, prior authorization requests were the highest they've ever been for Medicare Advantage Insurers, with 52.8M submitted (compared to 49.8M in 2023).

Additionally, Medicare is looking to implement more automated features to manage claims, including a pilot program where an AI claim validator is used for prior authorization. Teams need to be more diligent than ever to ensure that all required information is documented before any services are rendered.

Between Medicare Advantage denying 17% of their initial claims and added pressure on billing due to the changes in the One Big Beautiful Bill, it's time for community-based organizations to consider automated billing features to streamline processes while still providing top-quality care.

How the One Big Beautiful Bill Affects Claim Denials

The One Big Beautiful Bill Act of 2025 (OBBBA) was passed on July 4, 2025. It had a major focus on Medicaid, leading to funding cuts and policy changes. While community-based organizations may or may not be directly impacted, new policies are likely to put a strain on staff.

Some of the changes in the act include:

• Starting in 2027, states must conduct eligibility checks of most adults in the expansion population every six months. Previously, it was once a year. This increases the need for faster re-enrollment processes.
• With coverage changes occurring more often, CBOs have to deal with more retroactive eligibility issues and coordination-of-benefits errors.
• It will likely be more difficult for working families to afford health insurance coverage from the ACA marketplace without premium tax credits, requiring them to use community resources they wouldn't have previously needed.

With a higher administrative burden, CBOs will need to adjust workflows. They must ensure data is correct and minimize the risk of human error that would hinder access to care.

The Six Most Common Drivers of Medicaid and MCO Claim Denials

To reduce claim denial, your CBO needs to know what causes them in the first place. Here are the six most common drivers of Medicaid and MCO claim denials.

1. Missing or Incomplete Documentation

It's incredibly important that providers are able to collect all of the necessary data when delivering a service. Some of the most common errors on claims include:

• Absent credentials
• Dates
• Time in/time out
• Missing signatures
• Service details

All of these can cause the claim to get backed up, delaying the Medicaid billing cycle. Robust documentation must be built into your workflows to ensure that when it comes time to bill, the claim is 100% completed correctly.

2. Eligibility Verification Failure

When the billed claim doesn't match the beneficiary's active coverage or authorization requirements on the date of service, a claim is denied for eligibility verification failure.

In practice, that means the claim may be submitted for someone whose coverage was inactive, whose plan required a referral or prior authorization, or whose policy details were entered incorrectly.

Here are some common ways the denial happens:

• The provider assumes coverage is active instead of checking it before the visit, so the claim is sent after the patient's coverage has changed.
• The front-end staff misses Medicare Advantage plan rules, such as network restrictions, so the claim fails even if the service was medically appropriate.
• The patient information is entered incorrectly, which causes the payer's matching logic to reject the claim before it is processed.

3. Missing Prior Authorization or Referral Requirements

Prior authorization is Medicare's way of checking coverage rules before the service is delivered. Skipping it means the payer never had a chance to approve the claim. Referral requirements work the same way: they verify that the service was initiated by the right provider and fits the billing rules for that benefit.

Common denial triggers include:

• No prior authorization was requested at all.
• The referral was missing, expired, or came from a provider not cleared to refer for the service.
• The authorization request lacked documentation, codes, or medical necessity.
• The submitted claim did not match the approved authorization details, such as dates, codes, or provider information.

One of the best methods for claim denial prevention on prior authorization errors includes utilizing case management software that automates checking for eligibility before services are rendered.

4. Late Filing

Medicare has strict filing deadlines: claims usually must be received and processed within 12 months of the date of service. After that, they are often denied. Late filing turns payable services into nonpayable ones, even when the service was covered and documented correctly.

However, if your team can't file by the deadline, the Centers for Medicare and Medicaid Services (CMS) does have reasonable appeals for late filing. However, it must be a valid reason, such as a serious death or illness.

5. Coding or Modifier Errors

Medicaid relies on codes to decide what was done, how it was done, and whether it should be paid separately. If the code set does not match the documentation or a required modifier is missing, the claim can be denied.

When coding or modifier errors happen, the billing workflow usually looks something like this:

• The billed CPT, HCPCS, or ICD-10 code does not match the service documented, so Medicare treats the claim as inaccurate or unsupported.
• A required modifier is missing that shows a distinct service, professional component, or unrelated service during a global period.
• An incorrect modifier is used, which can make Medicare think the service was not separately payable.
• The diagnosis and procedure codes do not align, so the claim fails correct-coding edits.
• The service triggers the National Correct Coding Initiative or other Medicare edits, and the wrong code combination causes denial.

6. Duplicate Billing

If Medicare sees the same service billed more than once for the same patient, date of service, and provider, it often treats the second submission as not payable. Medicare's systems have edits that flag exact or suspicious duplicates, and those claims are often denied automatically before payment is issued.

Some common examples of this type of error include:

• Billing the same office visit twice by accident.
• Resubmitting a claim before the first one has finished processing.
• Billing a repeated procedure without the proper repeat-service modifier.
• Submitting a corrected claim without the original claim information, so it looks like a second claim instead of a correction.

Duplicate billing wastes time and delays cash flow, also risking compliance or an audit if they happen too frequently.

The Solution: Automated Claim Management

With so many errors at play, community-based organizations need billing systems that double-check their work automatically. With impact management software like PlanStreet, teams can streamline Medicaid billing while avoiding errors that lead to claim denials.

PlanStreet automates the claim management process through:

• Medicaid documentation-to-claim flow: service data captured in case management is converted into billable claims instead of being recreated manually.
• Billing workflows: the system supports payer-specific codes, units, modifiers, and authorization rules before submission.
• Eligibility and authorizations: verifies Medicaid eligibility and tracks service authorizations inside the billing process.
• Claims validator: powered by HIPAA-compliant AI, it ensures accuracy and improves claim success rates.
• Electronic submission: automates EDI claim submission and remittance handling, including 837 and 835 files.
• Denial handling: helps identify, correct, and resubmit denied claims.
• Compliance tracking: it monitors payer compliance, credentialing, and audit readiness, with reporting dashboards for claim status and denial trends.

PlanStreet turns documented services into Medicaid and MCO claim-ready submissions, then tracks denials, remittances, and reconciliation in the same platform.

Reduce Claim Denials With PlanStreet

Claim denials are costing community-based organizations time, revenue, and capacity they can't afford to lose. OBBBA-driven eligibility churn and expanded prior authorization requirements add pressure to already-stretched billing teams. The six denial drivers outlined here are preventable with the right infrastructure in place.

PlanStreet's integrated case management and billing platform closes the gap between service delivery and clean claim submission. It automates eligibility verification, authorization tracking, coding workflows, and EDI submission in one system. Less manual intervention means faster reimbursement and more time focused on the clients you serve.

If you're ready to reduce denials and recover lost revenue, schedule a demo with PlanStreet today.

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