Premera Blue Cross timely filing limit for original claim submission is 365 days (12 months) from the date of service for commercial plans in both Washington and Alaska. Medicare Advantage claims follow the same 365-day floor under CMS mandate (42 CFR § 422.520). Premera requests submission within 60 days as best practice but enforces the 365-day outer limit. A CO-29 timely filing denial can be appealed within 365 days of the EOP date (Level I). Level II appeals must be filed within 30 days of the Level I denial. Since December 30, 2025, all Premera provider appeal submissions route to a single fax: (425) 918-5592.
Why Premera's Timely Filing Structure Is Simpler Than Most Payers
Premera Blue Cross is one of the more straightforward payers on timely filing: it applies a consistent 365-day window from the date of service across its commercial and Medicare Advantage plans in Washington and Alaska. Unlike Aetna — which has different windows for in-network (90 days), out-of-network (12 months), and Medicaid (180 days) — Premera's limit is uniform enough that billing teams rarely need plan-type-specific tracking.
That said, there are three areas where practices lose revenue unnecessarily:
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Confusing the preferred submission window with the deadline. Premera's manual asks providers to submit within 60 calendar days of service. That is a best practice request, not an enforceable hard limit. Claims submitted between 61 and 365 days are still payable — but billing teams treating 60 days as the deadline leave late-discovered claims on the table.
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Missing the COB (secondary) submission window. Premera does not publish a specific secondary-claim timely filing deadline, but claims must accompany the primary payer's EOB to process. Billing teams that delay secondary submission waiting for the primary EOB to "clear" sometimes find themselves outside the 365-day outer limit counted from the date of service.
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Getting CO-29 denials on claims that were actually timely. Premera's system can issue erroneous CO-29 denials when clearinghouse acceptance records don't match Premera's internal receipt timestamp. These are winnable with the right documentation — but only if appealed within the 365-day Level I window from the EOP date.
Premera Claim Submission Timely Filing Limits by Plan Type
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| Plan Type | Timely Filing Limit | Clock Starts | Notes |
|---|---|---|---|
| Commercial — Contracted (WA) | 365 days | Date of service | Premera requests submission within 60 days as best practice; 365 days is the enforced outer limit under the Premera WA Provider Manual |
| Commercial — Contracted (AK) | 365 days | Date of service | Same 365-day limit applies statewide across all Alaska boroughs; Alaska prompt pay law governs clean-claim processing speed (30 days), not the filing window |
| Medicare Advantage (Premera MA) | 365 days (12 months) | Date of service | CMS-mandated minimum floor under 42 CFR § 422.520 — Premera cannot impose a shorter window for Part C claims |
| Coordination of Benefits (COB — Secondary) | No separate published window | Tied to primary EOB receipt | Submit secondary claims with primary EOB as soon as received; 365-day outer limit from DOS still applies — late primary processing can create a crunch |
| FEP (Federal Employee Program) | Verify at fepblue.org or call Premera FEP | Date of service | FEP plans operate under BCBSA program guidelines that may differ from standard commercial limits; confirm via Premera FEP line at 800-562-1011 |
| BlueCard (Out-of-Area) | Follow the member's home plan rules | Date of service | BlueCard® claims route through BCBSA; the member's home plan timely filing limit applies — Premera acts as the host plan and processes per BCBSA Inter-Plan rules |
60-Day 'Request' vs 365-Day Deadline
Premera's Provider Manual states providers should submit claims within 60 calendar days of covered services, but no later than 365 calendar days. This language is consistent across both the Washington and Alaska provider portals. The 60-day window is preferred for faster processing and cash flow — it is not a hard cutoff. Claims received between day 61 and day 365 from the date of service are accepted and processed normally.
Contract Language Can Extend the Standard Limit
The 365-day limit is Premera's default. Individual provider participation agreements occasionally specify a different window — most often an extended limit negotiated for high-volume or specialty practices. If your contract specifies a longer window, that governs over the manual. Pull your Premera contract addendum before assuming the 365-day default applies to your practice.
Premera Timely Filing Denial Appeal Deadlines
A CO-29 denial (CARC code 29 — "The time limit for filing has expired") is Premera's standard code for timely filing denials. Because it typically carries a CO (Contractual Obligation) group code, the balance is non-billable to the patient, making the appeal the only path to recovery.
Premera's appeal deadlines are more provider-friendly than most payers — the Level I window is exceptionally long.
| Appeal Level | Who Files | Deadline | Premera's Decision Timeline | Notes |
|---|---|---|---|---|
| Level I — Internal Appeal (Provider) | Provider / billing staff | 365 days from EOP date | 30 calendar days | The EOP (Explanation of Payment) issue date, not the date of service, starts the Level I clock |
| Level II — Internal Appeal (Provider) | Provider / billing staff | 30 days from Level I denial notification | 30 calendar days | Must be in writing; addressed to same PO Box; different reviewer than Level I |
| Expedited Appeal (Urgent) | Provider or member | As soon as clinically urgent | 72 hours | For timely filing denials, expedited review is rare — TFL disputes are administrative, not clinically urgent |
| External Review (Member) | Member (provider may assist) | 4 months after final internal denial | 45 days | Available after both internal levels exhausted; WA: Insurance Commissioner; AK: Division of Insurance |
| Member Appeal (Commercial) | Member / authorized representative | 180 days from EOB or denial notice | 30 calendar days | Member-side deadline differs from the provider-side 365-day window |
Level II Window Is Only 30 Days
Premera's Level I appeal window is one of the most generous in the industry — 365 days. But once Level I is denied, the Level II window drops to just 30 days from the Level I denial notification. Practices that wait to see if Level I resolves before tracking the Level II deadline often lose the right to a second internal review. Track both simultaneously.
How to Appeal a Premera CO-29 Timely Filing Denial
CO-29 timely filing denials are among the most recoverable denial types when you have the right documentation — because the question Premera's appeals team is answering is purely factual: was the claim submitted within 365 days of the date of service, or not?
Step 1: Verify the Applicable Window
Before building your appeal, confirm which limit applied to the specific claim:
- Was this a commercial WA or AK contracted claim? The 365-day standard applies.
- Was this a Medicare Advantage claim? The CMS-mandated 12-month floor applies — Premera cannot enforce a shorter window.
- Was this a COB secondary claim? The 365-day clock runs from the date of service, but the trigger for secondary billing is the primary EOB date. If the primary payer delayed, document that delay.
- Was this a FEP or BlueCard claim? FEP and BlueCard have separate program rules — confirm which limit applied before appealing.
Many CO-29 denials are issued in error when Premera's system logs receipt later than the actual EDI submission date. Confirming the correct window often reveals the claim was timely filed.
Step 2: Pull Timely Submission Proof
Premera's appeals process requires proof that the claim was transmitted within the applicable 365-day window. Acceptable documentation:
- 277CA clearinghouse acceptance report — the EDI transaction showing Premera's gateway accepted the claim on a specific date. This is the strongest evidence.
- Availity submission log — electronic submission timestamp if filed through Availity (Premera's preferred electronic submission channel).
- Practice management system transmission batch report — shows date the claim was sent from your PM system.
- For paper claims: Certified mail receipt or USPS tracking confirmation showing delivery date within 365 days of service.
Internal Notes Are Not Proof
"We documented the claim in our system" or "we know we submitted it on time" are not acceptable to Premera. You need an external, date-stamped transmission record that proves Premera — or a clearinghouse routing to Premera — accepted the claim within 365 days. If your clearinghouse can pull a 277CA for the date in question, request that before filing the appeal.
Step 3: Identify Any Valid Filing Exception
If the claim was genuinely submitted outside the 365-day window, Premera accepts timely filing deadline waivers only for specific, documentable external circumstances:
- FEMA-declared natural disaster affecting the provider's facility or operations during the filing window
- Verified Premera or Availity portal outage during the filing period — documented system downtime from Premera or your clearinghouse
- Retroactive member eligibility — coverage was not confirmed until after the filing window closed; requires documentation from the member or employer group
- COB delay caused by the primary payer — the primary carrier took longer than the remaining TFL window to issue an EOB, making timely secondary filing impossible through no fault of the provider
- Premera administrative error — Premera issued incorrect routing or address information that caused the delay
Premera does not accept staff turnover, billing software transitions, or general administrative oversight as exceptions.
Step 4: Use the Correct Appeal Form and Submission Channel
Since December 30, 2025, Premera consolidated all provider appeal submissions to a single fax number. Verify you are using the current routing.
Provider CO-29 Appeal Submission:
- Fax (fastest): (425) 918-5592 — include cover sheet with page count
- Mail: Premera Blue Cross, ATTN: Member Appeals, PO Box 91102, Seattle, WA 98111-9202 — use certified mail with return receipt to document timely filing of the appeal itself
- Form required: Provider Appeal Form Commercial Plans PBC (or Medicare Advantage Provider Appeal Form for MA claims) — download at premera.com/wa/provider/reference/forms/
- Email: AppealsDepartmentInquiries@Premera.com — for follow-up inquiries only, not initial appeal submissions
Your appeal letter for a CO-29 denial should:
- Reference CARC code 29 and state the applicable 365-day filing window explicitly
- State the date of service and the date the claim was originally submitted
- Attach the clearinghouse acceptance report or Availity log as primary proof
- Explain any exception if the 365-day window was genuinely missed
- Include the completed Premera provider appeal form with all required fields
Member Authorization Signature Required
Premera's provider appeal form requires a member authorization signature when a provider is appealing on behalf of a member. This is a Premera-specific requirement that differs from most payers. Missing this signature is one of the most common causes of appeal rejection — not denial, outright rejection without review. Get the authorization before submitting.
Step 5: Track the 30-Day Decision Window
Premera must respond to a standard Level I appeal within 30 calendar days of receipt. If Premera does not respond within 30 days, you have grounds to escalate directly to Level II or to the relevant state insurance regulator:
- Washington: Office of the Insurance Commissioner — 1-800-562-6900 or insurance.wa.gov
- Alaska: Division of Insurance — 1-800-467-8725 or commerce.alaska.gov/web/ins
Premera Timely Filing: Common Billing Mistakes
Treating the 60-Day Window as a Hard Deadline
Premera's manual asks for submission within 60 days — but 60 days is not a cutoff. Claims submitted between day 61 and day 365 are accepted and processed. Billing teams that write off late-discovered claims at 61+ days are leaving payable revenue uncollected.
Using the Service Date as the COB Secondary Clock
For secondary claims, the 365-day window starts from the date of service — but the trigger for secondary billing is the primary payer's EOB. If the primary takes 300+ days to process, you have less than 65 days to turn around the secondary claim. Track COB claims against the DOS clock, not the EOB receipt date.
Waiting for a CO-29 to "Clear Itself"
CO-29 denials do not self-reverse. A Premera timely filing denial becomes final if not appealed within 365 days of the EOP — and the balance cannot be billed to the patient. Every week of inaction on a CO-29 denial is a week closer to an unrecoverable write-off.
Filing the Wrong Appeal Form
Premera's form requirement is strict: commercial plan claims need the Commercial Provider Appeal Form; Medicare Advantage claims need the Medicare Advantage Provider Appeal Form. Submitting a commercial form for an MA claim does not redirect to the right team — it gets rejected. Download the correct form from premera.com/wa/provider/reference/forms/ before submission.
How Muni Appeals Handles Premera Timely Filing Denials
Timely filing denials are administrative denials — they require organized documentation and deadline tracking, not clinical judgment. They are also highly time-sensitive: the Level II window closes 30 days after the Level I denial.
Muni Appeals automates the Premera CO-29 workflow:
- Tracks claim submission against Premera's 365-day window by plan type
- Pulls clearinghouse acceptance reports and Availity logs for proof documentation
- Generates Premera-specific CO-29 appeal letters with correct window references
- Selects the right provider appeal form (commercial vs. Medicare Advantage)
- Tracks Level I and Level II deadlines from EOP date
Frequently Asked Questions
What is Premera Blue Cross's timely filing limit?
Premera Blue Cross requires original claims to be submitted within 365 days (12 months) from the date of service for commercial plans in Washington and Alaska. Premera requests submission within 60 calendar days as best practice for faster processing, but 60 days is not a hard cutoff — claims submitted up to 365 days are accepted.
Is Premera's timely filing limit the same for Medicare Advantage?
Yes. Premera Medicare Advantage plans follow the CMS-mandated minimum floor of 12 months (365 days) from the date of service under 42 CFR § 422.520. Premera cannot impose a shorter window for Part C claims.
What is the timely filing limit for Premera Blue Cross of Alaska?
Premera Blue Cross Blue Shield of Alaska uses the same 365-day timely filing limit from the date of service as the Washington plan. Premera is the only statewide health insurer in Alaska, and its provider manual for Alaska matches the Washington standard.
How long do I have to appeal a Premera CO-29 timely filing denial?
You have 365 days from the Explanation of Payment (EOP) date to file a Level I appeal. If Level I is denied, you must file Level II within 30 days of the Level I denial notification. Missing the Level II window exhausts your internal appeal rights.
Where do I submit a Premera provider appeal?
Since December 30, 2025, all Premera provider appeal submissions go to a single consolidated fax: (425) 918-5592. Mail goes to: Premera Blue Cross, ATTN: Member Appeals, PO Box 91102, Seattle, WA 98111-9202. Always use certified mail to document that the appeal was submitted within the deadline. Do not submit appeals by email — AppealsDepartmentInquiries@Premera.com is for follow-up inquiries only.
What documentation does Premera require to appeal a timely filing denial?
The strongest evidence is a 277CA clearinghouse acceptance report showing Premera's EDI gateway accepted the claim within 365 days of service. Availity submission logs and practice management system batch reports are also accepted. For paper claims, certified mail receipts or USPS delivery confirmations serve the same function. Premera requires a member authorization signature on the provider appeal form when the provider is appealing on behalf of a member.
Does Premera waive timely filing denials for administrative errors?
Only for specific, documentable external circumstances: FEMA-declared disasters, verified Premera or Availity system outages during the filing period, retroactive member eligibility situations, COB delays caused by the primary payer, or Premera administrative errors that caused incorrect routing. Premera does not accept staff turnover, billing software changes, or general oversight as exceptions.
How does COB secondary timely filing work with Premera?
Premera does not publish a separate timely filing window for COB secondary claims. The 365-day clock from the date of service governs. For secondary claims, you should submit with the primary payer's EOB as soon as you receive it. If the primary payer's slow processing leaves you with fewer than 60 days to submit secondary before the 365-day outer limit, document the primary EOB date in your records as protection if a CO-29 denial is issued.
Ready to Stop Losing Revenue to Premera CO-29 Denials?
Timely filing denials are preventable revenue loss — every CO-29 that sticks represents a legitimately payable claim that was submitted too late, or appealed without the right documentation.
Get Started:
- Track Premera's 365-day submission window automatically by claim
- Pull clearinghouse acceptance records for CO-29 appeal documentation
- Generate Premera-specific appeal letters with correct window references
- Monitor Level I and Level II deadlines from EOP date before they expire
This guide reflects 2026 Premera Blue Cross timely filing procedures based on the Premera Blue Cross Washington and Alaska Provider Manuals (accessed April 2026), and CMS regulations under 42 CFR § 422.520 governing Medicare Advantage timely filing floors. Individual provider contracts may specify different filing windows — verify your Premera participation agreement before relying on the 365-day default. FEP and BlueCard claims are governed by BCBSA program rules that may differ; confirm filing limits at fepblue.org or via Premera FEP at 800-562-1011. For the full Premera appeal process, denial strategy, and medical necessity guidance, see the Premera Blue Cross Appeal Guide 2026.