If there is one thing that catches even experienced billing teams off guard, it is the 90-day timely filing limit for Anthem (now Elevance Health).
Compared to other major insurers where 180 days, 365 days, or even 18 months is common this short window requires a fast, disciplined billing workflow.
One missed deadline, and you will see that dreaded CO-29 denial on your remittance advice.
Here is everything you need to know to stay compliant, avoid write-offs, and successfully appeal a denial if the worst happens.
What Is Timely Filing and Why Does It Matter?
Timely filing refers to the specific window of time within which a provider must submit a claim to an insurance company after the date of service. Miss the deadline, and the insurer denies payment no matter how medically necessary or correctly coded the service was.
For Anthem (Elevance Health), this is a particularly high-stakes issue because its window is among the shortest among major commercial insurers. A single administrative delay, a slow prior authorization, a patient eligibility hiccup, a billing software glitch can cost your practice thousands of dollars in revenue that you have already earned.
Here is a quick look at why this matters in context:
| Payer | Standard Timely Filing Window |
| Anthem (Elevance Health) | 90 days |
| Aetna | 120 days |
| Cigna | 90-180 days (varies by plan) |
| UnitedHealthcare | 90 days |
| BCBS North Carolina | 18 months |
| Medicare Fee-for-Service | 12 months |
With a 90-day window, you have approximately three months from the date of service. That sounds like plenty, but when you factor in coding time, prior authorization, and insurance verification, it disappears quickly.
The Standard Anthem Timely Filing Limit
For most Anthem commercial and Medicare Advantage professional claims, the filing window is 90 days from the date of service. Anthem standardized this 90-day window across its commercial and Medicare Advantage plans in October 2019, cutting what had been longer affiliate-specific windows. This change applies across all 14 states where Anthem operates under the Elevance Health umbrella.
The Medicare Advantage Trap
This is where many providers get burned. Many providers incorrectly assume that Medicare Advantage plans follow the CMS 12-month fee-for-service rule. That is wrong. Anthem’s provider contract overrides CMS timely filing standards for Medicare Advantage—the 90-day window applies regardless of CMS rules, effective October 1, 2019. Billing an Anthem MA claim at day 120 will result in insurance claim denial, and the fact that CMS gives 12 months for traditional Medicare will not help you.
Here is a breakdown of the standard deadlines:
| Submission Type | Timely Filing Window | When the Clock Starts |
| In-Network Initial Claim | 90 days | Date of service |
| Out-of-Network Initial Claim | 90 days (verify per plan) | Date of service |
| Secondary / Coordination of Benefits | 90 days from primary EOB | Date of primary payer’s EOB |
| Corrected / Appeal | 180 days from denial | Date of the denial notice |
| Corrected Claims | 365 days (only if original was timely) | Date of service |
Important: The 365-day corrected claim window is not a fallback for missed original filings. It applies only when the original claim was submitted on time. If you missed the 90-day window entirely, the corrected claim will not save you.
Plan-Specific Exceptions: When the Rules Are Different
While 90 days is the general rule, plan-specific products can have different windows. Here are the key exceptions to watch out for in 2026.
Empire BCBS (New York)
Empire Blue Cross Blue Shield of New York follows the standard 90-day limit for participating providers. However, non-participating providers in New York receive a much longer window of 15 months from the date of service.
This is one of the more generous exceptions in the Anthem network, so if you are non-contracted in New York, you have significantly more time.
Anthem CA Medi-Cal (Medicaid Managed Care)
California’s Medi-Cal program, managed by Anthem, operates under different rules :
- Participating providers: 180 days from date of service
- Non-participating providers: 210 days from date of service
These were updated in April 2026, so if you are billing for Medi-Cal patients, make sure your team knows the difference.
Other State Medicaid MCOs (IN, KY, OH, VA)
For Anthem Medicaid Managed Care plans in states like Indiana, Kentucky, Ohio, and Virginia, timely filing limits vary by state contract. State Medicaid contracts supersede Anthem’s standard 90-day rule.
Your best bet is to verify the exact limit in your state-specific provider manual before disputing any denial.
Freedom Health (Florida Medicare Advantage)
This Anthem subsidiary (now operating under the Anthem Medicare umbrella) runs its own deadlines:
- In-Network Initial Claim: 180 days from date of service
- Out-of-Network Initial Claim: 180 days
- Secondary / COB: 180 days from primary EOB
- Corrected / Appeal: 180 days from denial
Employer-Sponsored (Self-Funded) Plans
Self-funded employer groups can sometimes set their own filing limits that supersede Anthem’s standard. Always verify any special timelines for these groups
Quick Reference Table
| Plan Type | Timely Filing Limit | Clock Starts |
| Commercial (all Anthem states) | 90 days | Date of service |
| Medicare Advantage (all Anthem states) | 90 days | Date of service |
| Empire BCBS (NY) — Participating | 90 days | Date of service |
| Empire BCBS (NY) — Non-Participating | 15 months | Date of service |
| Anthem CA Medi-Cal — Participating | 180 days | Date of service |
| Anthem CA Medi-Cal — Non-Participating | 210 days | Date of service |
| Medicaid MCO (IN, KY, OH, VA, others) | Varies by state contract | Date of service |
| Corrected Claims | 365 days | Date of service (only if original timely) |
| Secondary / COB Claims | 90-180 days from primary EOB | Date of primary payer EOB |
| Freedom Health (FL MA) | 180 days | Date of service |
Anthem BCBS Timely Filing Limits by State (2026)
The table below shows the current filing limits for Anthem affiliates across all 14 states. Commercial and Medicare Advantage claims follow the 90-day standard in every state. Medicaid limits vary significantly by state contract—these are provided where publicly available, but always verify with your state-specific provider manual.
| State | Commercial (Limit) | Medicare Advantage (Limit) | Medicaid (Limit) |
| California | Anthem Blue Cross (90 days) | Medicare Advantage (90 days) | Medi-Cal: 180 days (participating), 210 days (non-participating) |
| Colorado | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by contract — verify in provider manual |
| Connecticut | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by contract |
| Georgia | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by contract — Georgia Medicaid is managed care |
| Indiana | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by HIP/managed care contract |
| Kentucky | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by managed care contract |
| Maine | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by contract |
| Missouri | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by contract |
| Nevada | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by program |
| New Hampshire | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by contract |
| New York | Empire BCBS: 90 days (participating), 15 months (non-participating) | Medicare Advantage (90 days) | NY Medicaid: often 365 days (state-run) |
| Ohio | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by managed care contract |
| Virginia | Anthem BCBS (90 days) | Medicare Advantage (90 days) | HealthKeepers Plus: often 365 days |
| Wisconsin | Anthem BCBS (90 days) | Medicare Advantage (90 days) | Varies by contract |
How to File Timely Claims: Your 2026 Action Plan
The 90-day window is non-negotiable for most Anthem plans. Here is how to build a workflow that ensures you never miss it.
Step 1: Track the Date of Service, Not the Date You Submit
This might sound obvious, but it is easy to lose track when you are juggling 50 claims at once. Use your practice management software to sort your aging claims by date of service, not by the date you created the claim.
Most billing systems allow you to run an “aging by DOS” report. Run this weekly. Any claim older than 60 days should be prioritized.
Step 2: Appeal Denials Immediately
This is crucial. When a claim is denied for CO-29 (timely filing), the clock for your appeal starts immediately. You generally have 180 days from the date of the denial notice to submit a corrected claim or appeal.
However, Anthem’s administrative appeals process requires you to file a written request with supporting documentation within 60 calendar days of the denial notice for certain disputes. Do not wait. File your appeal as soon as you get the denial.
Step 3: Use Clearinghouse Receipt Dates as Your Proof
Beginning with dates of service on or after June 15, 2026, Anthem updated its proof-of-timely-filing policy. A fax transmission confirmation will no longer be considered valid documentation of proof of timely filing.
Instead, Anthem will accept :
- Clearinghouse-assigned receipt dates from your reconciliation reports (this is your primary evidence for electronic submissions)
- Official mailing service return receipt/delivery confirmation plus a copy of the claim log identifying each claim submitted (for paper claims)
This is a major shift. If you are still faxing claims, consider moving to electronic submissions through a clearinghouse to maintain a clear, accepted audit trail.
Decoding the CO-29 Denial
The CO-29 denial means “The time limit for filing has expired.” When this happens, the payer is essentially saying: “We received this claim too late, and we are not paying it.”
However, a CO-29 denial does not always mean you are out of options. Here is what you need to do :
- Review the Claim: First, verify the actual claim submission date. Was it within the window? Sometimes the payer’s system timestamp is wrong. If it was submitted on time, you can appeal.
- Check for Exceptions: Before appealing, call the payer and ask if any exceptions apply. Common valid reasons for late submissions include:
- Patient eligibility updates (e.g., the patient gave you the wrong insurance card initially)
- Coordination of benefits issues (the primary payer delayed their response)
- System outages on the payer’s end
- Write an Appeal Letter: Draft a concise letter explaining the circumstances and requesting reconsideration. Include relevant details like patient information, claim number, and the reason for the delay.
- Attach Supporting Documents: This is critical. Include your clearinghouse transmission log, EDI acknowledgment, or mailing confirmation to prove the claim was transmitted on time. Without this, your appeal will fail.
Tip: For Anthem administrative appeals (non-medical denials like CO-29), you must submit your request through Availity or mail it to Anthem’s Appeals Department. The addresses are :
- Administrative Appeals: Anthem Blue Cross and Blue Shield Healthcare Solutions Appeals Department, P.O. Box 62429, Virginia Beach, VA 23466-2429
- Payment Appeals: Anthem Blue Cross and Blue Shield Healthcare Solutions Payment Appeals, P.O. Box 61599, Virginia Beach, VA 23466-1599
Anthem will communicate a decision within 30 calendar days of receiving the appeal.
Prevention Is Better Than Appeal
Filing a CO-29 appeal is time-consuming. Here is how to prevent the need for one.
- Verify Patient Insurance Before Every Visit: Insurance changes constantly. A patient who had United Healthcare last month might have switched to Anthem this month without telling you. Verify at scheduling, at check-in, and before submitting the claim.
- Know Your Payer ID: Use the correct Anthem payer ID for your state. For California, the payer ID is 47198. For other states, check your provider manual. Using the wrong ID can delay processing and eat up your 90-day window.
- Automate Your Billing Workflow: Use billing software that flags claims approaching their deadline (30 days out, 14 days out, 7 days out). If you are still mailing paper claims for any commercial payer, you are losing money.
- Double-Check Before You Submit: Most denials are not about deadlines—they are about errors. Wrong patient ID number, missing modifier, expired authorization—each correction eats 5-15 days of your filing window. Build a three-step check: Biller reviews, software scans, second biller reviews high-dollar claims.
Your 2026 Anthem Timely Filing Checklist
Here is your action plan to implement this week:
- Pull every unpaid claim older than 60 days. Sort by date of service.
- Identify any approaching the 90-day Anthem window.
- For any Anthem claim approaching day 75, escalate for immediate attention.
- Update your proof-of-filing system—stop relying on fax confirmations.
- For any CO-29 denials older than 30 days, file an appeal now (you have 60 days total).
- Train your front desk on the new June 2026 proof-of-filing policy.
- Verify your billing software has the correct Anthem payer ID for your state.
The Bottom Line
Anthem’s 90-day timely filing limit is strict but manageable. The key is speed and prevention. Submit claims as soon as possible. Use clearinghouse receipts as your proof. And if a CO-29 denial comes in, appeal it immediately with documented proof that you submitted on time.
Do these things, and you will stop losing revenue to the calendar. Miss them, and you will be writing off thousands in claims that should have been paid.
Stop Losing Anthem Claims to the Calendar
The 90-day window punishes slow workflows, not bad medicine. If your team is already stretched across coding, prior auth, and eligibility, a three-month filing limit is a standing liability and the June 2026 proof-of-filing changes only raise the stakes.
UControl Billing is a New York–based medical billing company providing end-to-end revenue cycle management to practices and facilities across all 50 states. We build the discipline this guide describes into your day-to-day operations: aging-by-DOS tracking that flags Anthem claims before day 75, clearinghouse-backed proof of timely filing on every submission, and a denial management team that turns CO-29 denials into recovered revenue not write-offs.
