Highmark billing: timely filing, corrected claims and appeals

Highmark filing, prior authorization and portal

Appeal levels

Top denials from Highmark

What is the Highmark timely filing limit?

Your Highmark contract controls. Highmark's Provider Manual, Chapter 6, Unit 1, says claims not received within the time frame in your contract are denied for untimeliness. If the contract is silent, the manual sets 365 days from the last date of service in Pennsylvania and West Virginia and 180 days from the date of service in Delaware, unless the member's policy provides a different period.

A secondary claim has the same limits with a different start. The manual says if Highmark is secondary, the claim must carry the primary payer's explanation of benefits and be received inside the same time frames, counted from the primary payer's finalized or payment date shown on that EOB.

If a claim denies for timely filing and you did file it inside 365 days, the New York policy says to resubmit the claim and the denial with your appeal. For the general rule on filing clocks, see timely filing limits by payer, and use the timely filing calculator once you have the limit from your contract.

How long do I have to send a corrected claim to Highmark?

Since September 1, 2026, Highmark requires corrected claims within 15 months, which is 455 calendar days, of the finalization date of the original claim. The Highmark news notices say corrected claims are identified by a bill type ending in 5 or 7 on facility claims or frequency code 5 or 7 on professional claims, and that later ones are denied for timely filing. The notices exclude corrected claims for BlueCard Home and the Federal Employee Program.

The clock starts at finalization, not receipt. Highmark defines the receipt date as the date it received the original claim and the finalization date as the date it completed processing, so the 455 days begin when the original claim finishes processing.

Highmark said its Provider Manual section 6.1 would be updated on September 1, 2026 to match. The May 2026 manual page this guide quotes for state defaults still showed the earlier New York corrected claim wording, so treat the news notice as the current rule for corrected claims.

Bill types and the original claim number

For facility claims, Unit 3 of Chapter 6 tells facilities to use adjustment bill types XX7, XX8 or XX5 for claims previously submitted on paper or electronically. The table in the manual separates the three.

Highmark requires the original claim number for XX5, XX7 and XX8 claims sent through Availity Claims and Encounters or the 837I. Report it in the Adjustment Claim Link field. On the 835, Highmark denies the superseded claim with CARC CO-129, prior processing information appears incorrect, and adds RARC N770, which says the adjustment request was processed. That CO-129 is expected on adjusted claims, so check that the replacement paid before you chase it.

How do I submit claims and check status with Highmark?

Highmark expects facility claims electronically and routes status and inquiries through Availity. Unit 3 says Highmark requires facility providers to bill electronically on the 837 Institutional (837I), that UB claim submission is also available in Availity, and that paper UB-04 is allowed in some cases.

• Billing disputes: network participating providers can send an inquiry with Message this Payer in Availity, call Provider Services, or write to Customer Service.
• BlueCard members: open a Claim Inquiry in Availity rather than calling the member's home plan.
• Remittances: the manual says Delaware, Pennsylvania and West Virginia 835s come from PNC-ECHO Health Trust under ECHO payer ID 58379, and New York 835s come from either PNC-ECHO Health Trust under ECHO payer ID 55204 or Administrative Services of Kansas.

What are the Highmark appeal levels and deadlines?

Highmark splits disputes into a billing dispute about how a claim processed and a post-payment review dispute about a coding or clinical review. The manual states no single day count for the billing dispute, and it sets deadlines for post-payment appeals in the letter you receive. Read each letter's date as the clock.

Member appeals are separate. The manual says every Highmark policy has an anti-assignment provision, an assignment of benefits form is not valid, and a provider appeals as the member's authorized representative to use the member appeal route. In West Virginia, the Retroactive Denial Act gives the provider 40 days after a retroactive denial to say it will reimburse or ask for a written explanation, then 30 days to repay or give notice it disputes the denial.

What happens in a Highmark post-payment review, and how long can Highmark recover money?

Highmark's Financial Investigations and Provider Review unit selects providers by utilization and billing pattern against peers, reviews a statistically random sample of records, and usually uses a certified professional coder or registered nurse. It can also pend a claim for review before payment. The results come in writing by certified mail, and fax if applicable.

1. Read the findings letter. The provider has 30 calendar days to rebut with clarification or supporting documentation.
2. Ask in writing for the review worksheets, and ask for a meeting with the review staff if you want to go through the results, give more documents or discuss repayment arrangements.
3. If you still disagree, request an appeal inside the time stated in the findings letter. A determination letter follows.
4. Take the external step your state and provider type allow, shown in the table above.

For E/M reviews, Highmark checks the AMA CPT guidelines and the CMS documentation guidelines. The manual says each entry must show who documented it, with credentials, the date and the specific time, including start and stop times for timed services, and that cloned or conflicting records may be disallowed and counted at zero in the overpayment calculation. A reviewer who finds documentation that supports a higher code than billed gives credit for the underpayment.

Each limit has exceptions the manual lists, including fraud, duplicate claims, self-funded plan requests, government program requirements and, in West Virginia, BlueCard claims. Check the exception list before you assume a recovery is out of time.

How do I check eligibility and submit prior authorization for Highmark members?

Highmark requires authorization for all inpatient admissions, medical and behavioral health, and for certain outpatient services, procedures, durable medical equipment and supplies, before you perform them. That comes from Chapter 5, Unit 2 of the Provider Manual; the detailed lists sit behind the Availity login.

Facilities should hold the claim until the authorization decision is final. Unit 3 recommends waiting to submit until all authorization determinations are made and, if inpatient admission is not authorized, until the facility decides whether to appeal. If the inpatient stay is judged not medically necessary, the outpatient services in the stay, including emergency and observation, may be billed.

If an inpatient claim went out before the final determination, the process is a void and a new claim: submit an XX8 adjustment to void the original inpatient claim, then bill the outpatient emergency or observation services. A facility that bills an inpatient stay with no preservice review and no authorization gets a denial; it can ask for retrospective review with the medical records, and appeal rights apply to a medical necessity denial.

What facility billing rules does Highmark set for hospitals and ERs?

Highmark's Pennsylvania Billing Highlights, which show the UB-04 locator fields needed by facility type, sit in the Provider Resource Center behind Availity, under Claims and then Reimbursement Resources.

Which denials come up most on Highmark claims?

The manual's own examples point to authorization, adjustment and timeliness denials. The table maps each to the CARC you will see on the 835.

Overpayments show up on the remittance. Unit 7 says Highmark lists overpayments in a separate section of the EOB and 835, sends no letter, and deducts the amount from a later EOB or 835 about 60 days after notification unless you appeal or pay by check.

How do I dispute an out-of-network underpayment from Highmark?

Highmark's Provider Manual covers participating provider billing, so out-of-network payment disputes run under federal and state surprise billing rules. Our No Surprises Act pages cover them: open negotiation, federal IDR and state surprise billing laws.