Claim Status Follow-Up: When to Check the Portal, Call the Payer, or Send a 276

Updated November 5, 2026, based on CAQH, CMS, the eCFR, X12 and First Coast Service Options as of that date.

Send a 276 for claim status in bulk, check the payer portal when the 277 response doesn't say enough, and call only when neither tells you what the payer needs. That order matches what each channel does well and what it costs.

The 2024 CAQH Index puts a manual medical claim status inquiry at $18.18 in combined plan and provider cost, $13.80 of it on the provider side, and 25 minutes of provider staff time. A fully electronic inquiry costs $3.68 and takes 7 minutes. A portal or IVR check sits in between, at $5.28 and 10 minutes.

The cheapest channel isn't always the most useful one, though. Stakeholders quoted in CAQH CORE's brief on the claim status transaction said a call or portal visit often returns more current information than the 277. So use portals and phones only for the claims that need them.

Check only once the claim can have a status

First, make sure the claim made it into the payer's system. For Medicare, a 999 acknowledgement comes back once the contractor has checked that the file is readable. A 277CA follows and flags individual claims rejected for errors. CMS's guide to checking Medicare claim status says these front-end edits can take up to 3 days. It also warns against resubmitting while a claim is still in editing, because the resubmission becomes a duplicate.

Once accepted, the claim gets the number you'll use in every follow-up: a DCN for Part A and home health and hospice, or an ICN for Part B. CMS suggests waiting at least 14 days after an electronic submission and 29 days after a paper one before checking status. Medicare pays interest on a clean claim that isn't paid within 30 calendar days.

Commercial and Medicaid timelines vary by payer. Check each payer's provider manual for its processing window before you build follow-up rules around it.

Send a 276 for anything in bulk

The 276 request and 277 response are the HIPAA standard for claim status under 45 CFR 162.1402. CMS's claim status request and response page recommends them over Medicare's phone and portal options, because software can generate the requests and post the responses. They run in batch, where responses come back later, or in real time, one claim at a time. A Medicare batch 277 can take up to 24 hours. For real-time requests, the CAQH CORE operating rules set a maximum response time of 20 seconds, met if 90 percent of responses in a calendar month arrive within it. For Medicare Part B, CMS asks for the billing provider's NPI and the ICN on the request.

Because the 277 is structured data, its status codes can post straight to the account in your billing system. That makes the 276 the right default for routine follow-up across a full AR list. (For the eligibility side of the same question, see the guide to insurance eligibility verification automation.)

Read the 277 category code before anyone picks up the phone

Every 277 carries a category code from X12's claim status category code list. The first letter tells you most of what you need:

• A codes (acknowledgement): A1 means received and A2 means accepted. A3 means returned as unprocessable, and A6 and A7 mean rejected for missing or invalid information. Fix the claim and resubmit.
• P codes (pending): P1 is pending, P2 is under payer review, and P5 is an administrative hold. Usually you wait. P3 and P4 are different: the payer is waiting on information from the provider or the patient, so act now.
• R codes (more information requested): R1 asks about an entity, R3 about the claim or a line, and R4 for documentation. Send what's asked.
• F codes (finalized): F1 is paid, F2 is denied, and F4 is complete with no payment. Denials move to your denial management workflow.
• E codes and D0 (no answer): E0 flags a problem with your request data, E1 and E2 a payer system that's down or not responding, and D0 an unsuccessful search. Check the request, then retry or use another channel.

Most claims can be sorted from the category code alone. The rest go to the portal.

Go to the portal when the 277 is too vague

CAQH CORE research in the 2024 CAQH Index found that one reason providers rely on manual processes is the "more robust information" they get that way than from the 277. Its example is a claim pended for documentation. The response should name the documents the payer needs, but a generic status can lead to a call or email. CORE's brief says calls or portal visits are often needed for clarification.

Search criteria are the other reason. Health plans don't all match requests on the same fields, so a 276 can come back "claim not found," or return several claims, when the claim is really there. Before treating a claim as missing, look it up in the portal with the payer's own search fields.

For Medicare, CMS calls the contractor's portal the fastest way to check the status of an individual claim.

Call when the portal can't say what's missing

The phone is the slowest channel. A phone inquiry takes medical providers 25 minutes of staff time on average, the most of any task in the CAQH Index. One medical practice told CAQH: "We primarily call. I don't know any insurance that you can email and get back a response within a few days."

For Medicare, the call goes to the IVR, not a person. CMS's provider communications manual tells Medicare Administrative Contractors to require the IVR for claim status, and representatives may give it if the IVR clearly isn't working. First Coast Service Options, a Medicare contractor, says its customer service representatives on the toll-free line can't give claim status. Most of those calls, it notes, come from entities representing Medicare providers. Inquiries there must go through the IVR or the portal.

Before a call:

• Have the claim number and the identifiers the IVR or representative will ask for in front of you.
• Write down the call reference number and what you were told, so the next person doesn't start over.

A simple routing rule for your team

1. Confirm the claim was accepted (999 and 277CA), then wait out the payer's processing window.
2. Send 276s in batch for every claim past that window.
3. Sort the 277 responses by category code. Post finalized claims, resubmit rejections, and send requested information.
4. Check the portal for P3 and P4 claims, vague pending statuses, and "claim not found" responses.
5. Call only when the portal doesn't say what's missing, and log the reference number.

Teams split this work in different ways. Some keep steps 4 and 5 with staff, some use clearinghouse tools or payer APIs, and some automate the portal and phone steps. Whatever the split, the order stays the same.

Frequently asked questions

How long should I wait before checking Medicare claim status?

CMS suggests at least 14 days after an electronic claim and 29 days after a paper claim. Before that, confirm acceptance with the 999 and 277CA instead of checking status.

What's the difference between a 277CA and a 277?

The 277CA is an acknowledgement. It comes back after submission and flags claims rejected before processing. The 277 answers a 276 claim status request about a claim that's already in the payer's system.

Why does a 276 come back "claim not found"?

Often because the payer matches requests on different fields than the ones you sent. CAQH CORE notes that search criteria vary by health plan. Check the identifiers on the request, then look the claim up in the portal.

Can our billing company call the Medicare contractor's customer service line for claim status?

Expect to be sent to the IVR or the portal. CMS tells Medicare Administrative Contractors to require the IVR for claim status, and First Coast Service Options says its toll-free representatives can't give it. Check your own contractor's guidance.

Is a portal or phone answer more current than the 277?

Often, yes, according to stakeholders in CAQH CORE's brief. That's why the 276 is the default and the portal is the next step, not the other way around.

Working claim status across portals and phone?

Champ automates the portal and phone steps of claims follow-up. We set it up and run it, so your team sees only the finished results. If 277s keep sending your staff to portals and phone lines, learn more here.

This post is general information, not legal, compliance or billing advice. Rules vary by payer and Medicare contractor and change often, so confirm with the payer or your Medicare Administrative Contractor before acting. Champ is not affiliated with or endorsed by CMS, First Coast Service Options, CAQH or X12.