PR-1 Denial Code: Description, Causes, and How to Collect From the Patient

The PR-1 denial code appears on your 835 Electronic Remittance Advice (ERA) and Explanation of Benefits (EOB) as a two-part code. PR stands for Patient Responsibility, which is the Claim Adjustment Group Code.

The number 1 is the Claim Adjustment Reason Code (CARC), officially defined by X12 as “Deductible Amount,” making the pr 1 denial code deductible amount the patient’s responsibility.

Together, the PR-1 denial code tells you the payer processed the claim correctly and applied part or all of the charge to the patient’s annual deductible because it hasn’t been met yet. This isn’t a denial in the traditional sense. It’s a patient cost-share calculation.

You can bill the patient for this amount. Unlike a CO adjustment, which is a provider write-off, a PR adjustment legally transfers the balance to the patient.

In 2026, the pr 1 2 3 in medical billing sequence fires more frequently than ever, with Medicare Part B deductibles rising to $283 and over 36% of covered workers enrolled in high-deductible health plans, PR-1 volume is higher than ever.

This guide covers the official pr1 denial code definition, every root cause, the 2026 deductible figures, a payer-by-payer verification table, and the complete step-by-step collection workflow.

This article covers pr 1 in medical billing workflows including the full pr 1 2 3 in medical billing sequence, and is written for medical billers, AR specialists, and practice managers managing patient responsibility balances on their remittance advice.

What Is the PR-1 Denial Code?

The Official CARC 1 Definition (Straight From X12)

The official X12 definition for CARC 1 is “Deductible Amount.” The pr 1 denial code description “Deductible Amount” is the pr 1 denial code deductible amount description maintained by the Washington Publishing Company under CMS coordination.

CARC 1 has been active since January 1, 1995. The X12 CARC official list was last reviewed on May 1, 2026, and the code remains active with no changes to its description.

What this means for pr1 in medical billing: the payer processed the claim and applied all or part of the allowed amount to the patient’s deductible. The service was covered. The claim was adjudicated. The payer didn’t make an error. The patient simply hasn’t met their annual deductible yet.

The pr 1 denial code description covers two separate pieces of information that billers must read independently. CARC 1 tells you WHY the payer didn’t pay. The PR group code tells you WHO owes the money. Billers who only read the 1 and don’t check the group code make expensive collection errors.

What the PR Prefix Actually Means for Your Billing Workflow

The PR group code is the most operationally important field on any remittance adjustment. Three group codes govern claim adjustments:

PR (Patient Responsibility): The patient owes the balance. The provider can bill the patient directly. PR-1 falls here.

CO (Contractual Obligation): The provider absorbs the balance as a contractual write-off. The patient cannot be billed. CO-1 falls here.

OA (Other Adjustment): A payer-initiated adjustment that assigns liability to neither the provider nor the patient automatically. Review case by case.

The compliance implication is direct. Per CMS Medicare ERA group code guidance, Medicare beneficiaries may be billed only when Group Code PR is used with an adjustment. When CO appears instead of PR, billing the patient is a program rule violation.

How PR-1 Appears on Your 835 ERA

On the 835 transaction, PR-1 appears in the CAS (Claim Adjustment) segment. CAS01 is the group code (PR). CAS02 is the CARC (1). CAS03 is the dollar amount applied to the deductible. Your billing software combines these and displays “PR-1” on your denial report or remittance summary.

PR 01 is a post-processing adjustment, not a front-end rejection. The claim reached the payer’s adjudication system, was reviewed, and processed correctly. The patient’s deductible status at the time of adjudication determined the PR-1 amount. Resubmitting the claim doesn’t fix a valid PR-1. The fix is billing the patient.

When a RARC does accompany PR-1, check it before taking any action. A RARC pointing to a preventive service exception or an ACA-mandated coverage change can mean the PR-1 was applied incorrectly.

PR-1 vs CO-1: Who Owes the Money and What You Must Do Next

The reason code 1 means deductible amount regardless of which group code precedes it. What changes is who owes that deductible.

The group code is the most important field on the remittance advice, and it’s the field most billing teams don’t check before taking action. Checking it takes five seconds. Getting it wrong costs you patient relationships, compliance exposure, and revenue.

The Group Code Comparison Table (CO-1, PR-1, OA-1)

For Medicare claims, CMS is explicit that beneficiaries may only be billed when the PR group code is used. Applying a CO group code to a Medicare claim and then billing the patient anyway is a program rule violation. See CMS Medicare ERA group code guidance for the specific program requirements.

Why This Distinction Matters More Than the Code Number

Three practical consequences of getting the group code wrong:

If your team bills the patient for a CO-1 amount, you’ve violated your payer contract. The payer can audit, recoup, and in serious cases terminate your participation.

If your team writes off a PR-1 amount instead of billing the patient, you’re leaving collectable revenue on the table. PR-1 balances are legitimate patient obligations. Writing them off as bad debt is a revenue cycle failure, not a compliance requirement.

If your team doesn’t check the group code before sending a patient statement, patients with secondary insurance get billed incorrectly. The secondary payer may cover the deductible, making your patient statement both premature and potentially wrong.

The CO-45 denial code is the most common CO adjustment that appears on the same remittance as PR-1 , posting them correctly requires reading both codes.

If your remittance posting workflow doesn’t have a group code check built in before any patient statement generates, One O Seven RCM’s AR team can audit your current process and close that gap.

Is PR-1 the Patient’s Responsibility? (Is PR 1 Patient Responsibility?)

Yes. Is pr 1 patient responsibility? It is. When the PR group code appears alongside CARC 1 on your remittance, the patient owes the deductible balance. You can bill the patient. You should bill the patient.

This is the opposite of a CO adjustment. CO means the provider absorbs the adjustment as a pr 1 in medical billing write-off scenario that the provider can’t pass to the patient. PR means the patient owes it.

PR-1 is one of the few denial codes where billing the patient is not only permitted but required if you want to collect that revenue.

When PR-1 Is Correct and the Patient Owes the Full Balance

Three scenarios where PR-1 is valid and patient billing should proceed immediately:

Scenario 1: The patient hasn’t met their annual deductible for the current plan year. This is the standard PR-1 scenario. Verify via the payer portal that the applied amount matches the patient’s remaining deductible. If it does, send the patient statement that day.

Scenario 2: The patient is on a High Deductible Health Plan (HDHP). HDHPs have deductibles as high as $9,450 for individuals in 2026 under IRS guidelines. PR-1 fires on virtually every claim for HDHP patients until they reach their deductible. This is expected behavior. Don’t investigate it as a denial. Work it as a patient balance. This is standard pr1 in medical billing behavior for HDHP panels.

Scenario 3: The plan year just reset. January through March sees the highest PR-1 volume of the year because deductibles reset on January 1 for most calendar-year plans. Prepare your patient collections workflow for this spike every year.

When PR-1 Is Wrong and You Should Not Bill the Patient

Three scenarios where PR-1 was applied incorrectly and you should dispute it before billing the patient:

Scenario 1: The service is ACA-mandated preventive care. Under the ACA preventive services coverage requirements, preventive services must be covered without cost-sharing when provided by in-network providers. Annual wellness visits, screening colonoscopies at recommended ages, and approved immunizations cannot generate PR-1 if billed correctly. If PR-1 appears on a preventive service, the claim was miscoded or the payer made an error. Correct the coding and resubmit before billing the patient.

Scenario 2: The patient’s deductible has already been met. The payer’s system sometimes lags behind deductible accumulation. Pull the patient’s current year-to-date deductible accumulation from the payer portal. If the deductible was already met, file a dispute with documentation of prior payments.

Scenario 3: The RARC indicates a contract-specific waiver. RARC N364 states: “According to our agreement, you must waive the deductible and/or coinsurance amounts.” If N364 appears alongside PR-1, check your contract before billing the patient. Billing when your contract requires a waiver is a compliance violation.

Common Reasons You’re Getting PR-1 Denials

Not every PR-1 has the same root cause. The cause determines whether you correct and resubmit, dispute the deductible application, or bill the patient immediately. Identifying it correctly is the only way to pick the right action path. Work through this list before routing any PR-1 denial in your system.

Cause 1: The Deductible actually Has Not Been Met

This is the correct, valid pr1 denial code scenario. The patient’s plan year deductible is unmet on the date of service. The payer applied the allowed amount to the deductible balance correctly. No coding error. No payer mistake. You don’t appeal this.

You don’t resubmit this. You bill the patient for the applied amount. This cause accounts for the majority of PR-1 volume in any billing department. Treat it as a patient collections trigger, not a denial management item.

Cause 2: Benefits Weren’t Verified Before the Service

Your front desk didn’t confirm deductible status before the patient walked in. You billed the payer, the claim processed, and PR-1 appeared because the deductible was still open. The fix is running real-time eligibility verification 24 to 48 hours before every appointment.

That one process change eliminates the largest share of surprise PR-1 volume in pr 1 in medical billing workflows. See our guide to prior authorization and eligibility verification for the full pre-service workflow.

Cause 3: Deductible Information in Your Billing System Is Outdated

Your practice management system stores a deductible balance that no longer reflects the patient’s current accumulation. This happens most often when patients have been seen at other facilities that you don’t know about.

Those visits applied charges to the deductible that your system never recorded. Pull the current deductible accumulation directly from the payer portal before every encounter. Don’t rely on your system’s cached balance.

Cause 4: The Patient Has Multiple Insurance Plans and Primary Deductible Isn’t Satisfied

When a patient has dual coverage, the primary payer adjudicates first. If the primary plan’s deductible hasn’t been met, PR-1 fires from the primary payer.

The secondary payer may cover part or all of the deductible amount, depending on the secondary plan’s coordination of benefits rules. Always check secondary eligibility before billing the patient on a PR-1.

The PR-27 denial code explains the secondary billing sequence in the PR code family.

Cause 5: Service Was Miscoded and Applied to Deductible Incorrectly

ACA-mandated preventive services must be covered without cost-sharing. If your coder used diagnostic ICD-10 codes instead of screening codes, the payer reclassified the service from preventive (no cost-sharing) to diagnostic (subject to deductible).

The pra1 denial code description sometimes surfaces in this scenario when billers note incorrect preventive claim coding. This cause requires a coding correction and resubmission, not patient billing. Audit preventive care claims that return with PR-1 every time.

See the ACA preventive services coverage requirements for the specific screening code requirements.

Cause 6: The Plan Year Just Reset

January through March is PR-1 season. Most commercial and employer-sponsored plans reset deductibles on January 1. Patients who met their deductible in November suddenly owe the full deductible amount again in January.

Build a “plan year reset” communication to patients in late December explaining that their deductible has reset and that upcoming visits will likely include a deductible amount.

How the Deductible Amount Is Calculated on a PR-1 Denial

When PR-1 fires, the dollar amount on the remittance isn’t always the full billed charge. It’s based on the payer’s allowed amount, not what you billed. Understanding this math prevents two common billing errors: overcharging the patient and undercharging the patient.

A Worked Example of PR-1 With CO-45 on the Same Claim Line

An established patient office visit is billed at $200. The payer’s contracted allowed amount is $130. The patient has a $1,500 annual deductible and has paid $400 of it. The remaining deductible is $1,100. The claim adjudication produces two adjustments on the same line:

CO-45: $70 write-off. The difference between the $200 billed charge and the $130 allowed amount is the provider’s contractual adjustment. It goes to the CO group code. The provider writes it off. The patient doesn’t owe it. See our CO-45 denial code article for how this write-off posts.

PR-1: $130 applied to deductible. The allowed amount of $130 is applied to the patient’s remaining deductible of $1,100. The patient now has $970 remaining on their deductible. The provider bills the patient $130.

The patient owes $130, not $200. Billing the patient the full billed amount instead of the allowed amount is a balance billing violation in most states. See the CMS No Surprises Act balance billing protections for the federal requirements.

What Happens When the Patient Has Partially Met the Deductible

Same scenario but the patient has $80 of deductible remaining instead of $1,100. The allowed amount is $130.

PR-1 applies: $80 to the deductible. The patient’s deductible is now met.

PR-2 follows: $10 coinsurance (20% of the $50 remaining after deductible is satisfied, at standard 80/20 split).

Payer pays: $40 (80% of the $50 amount above the deductible threshold).

This is why billers can’t assume a single pr1 denial code on a claim represents the patient’s entire obligation. Always check whether PR-2 (coinsurance) or PR-3 (copay) also appear on the same remittance before generating the patient statement.

If your posting team isn’t separating CO-45 from PR-1 on every claim line before issuing patient statements, One O Seven RCM’s payment posting specialists review this exact workflow as part of onboarding. Start with medical claim submission workflow review.

How to Resolve a PR-1 Denial: Step-by-Step (PR 1 Denial Code Resolution Workflow)

The correct pr 1 denial code resolution path depends entirely on what you find in the first two steps. Most billing teams skip straight to billing the patient without checking the group code or verifying the deductible calculation.

That skip creates compliance exposure and patient billing disputes that cost more time than the original claim was worth. Work these steps in order.

Step 1: Confirm the Group Code Before Touching the Claim

Pull the ERA and locate the CAS segment for the denied service line. Read CAS01. If it shows PR, the patient owes the balance. If it shows CO, the provider absorbs it as a write-off. The code number 1 tells you it’s a deductible issue. The group code tells you who pays. These are two different fields. Billing teams that misread CO as PR or skip the group code check entirely create the most expensive billing errors in the revenue cycle.

Step 2: Verify the Applied Deductible Amount Against the Payer Portal

Log into the payer’s online portal and pull the patient’s current deductible accumulation for the plan year. Confirm three things: first, the applied amount matches the patient’s remaining deductible balance; second, no other claims from the same date of service have already satisfied the deductible; third, the deductible hasn’t already been met by claims from other providers. If the applied amount is correct, move to Step 3. If it’s wrong, skip to Step 6.

Step 3: Check Whether the Patient Has Secondary Insurance

Before issuing any patient statement, verify whether the patient carries secondary coverage. Run a 271 eligibility transaction or call secondary benefits to confirm whether the deductible balance is covered. If secondary covers it, bill secondary immediately. Don’t bill the patient first and then discover secondary would have paid. The PR-27 denial code covers the secondary billing pathway when PR codes need coordination.

Step 4: Confirm the Service Was Not ACA-Mandated Preventive Care

Pull the CPT code and ICD-10 diagnosis code from the original claim. Cross-reference against your payer’s list of ACA-mandated preventive services. Annual wellness visits, colorectal cancer screenings, and immunizations at recommended ages are the most common services that generate incorrect PR-1 when miscoded as diagnostic. If the service was miscoded, submit a corrected claim before billing the patient.

Step 5: Determine Your Action Path

Based on Steps 1 through 4, route the pr 1 denial code resolution into one of three paths:

Path 1 (Patient Billing): Group code confirmed as PR. Deductible amount verified as correct. No secondary coverage. Service confirmed as not preventive. Generate the patient statement.

Path 2 (Secondary Billing): Patient has secondary insurance that may cover the deductible. Bill secondary with the primary ERA attached. Hold patient statement pending secondary adjudication.

Path 3 (Dispute or Corrected Claim): Deductible amount is wrong, or the service was miscoded preventive care. File a dispute or submit a corrected claim before any patient billing. Use revenue cycle management services for systematic dispute tracking.

Step 6: Bill the Patient or Dispute the Deductible Application

For Path 1: Generate the patient statement showing the payer’s adjudication, the deductible amount applied, and the balance due. Include the EOB line showing PR-1 so the patient can see the payer’s determination. Offer a payment plan for balances above $200 to increase collection rates and reduce disputes.

For Path 3: File the dispute through the payer portal or by phone. Reference the specific error, the correct deductible accumulation, or the corrected coding as applicable. Document the dispute date and the payer representative’s name. Per Medicare claim dispute and appeal timelines, most payers respond within 30 to 60 days.

Step 7: Track the Patient Balance and Follow Up on Collection

PR-1 doesn’t close when you send the statement. It closes when the patient pays. Route every open pr1 denial code patient balance into your AR follow-up workflow at 30, 60, and 90 days. At 30 days, send a reminder statement. At 60 days, call the patient. At 90 days, escalate to a payment plan discussion or financial counseling referral. Patient AR that sits past 90 days has a dramatically lower collection rate than patient AR worked in the first 30 days.

If your team’s open PR-1 patient balances are sitting past 60 days without a follow-up workflow assigned, One O Seven RCM’s AR specialists run payer-specific patient collection workflows that keep PR-1 revenue from becoming bad debt write-offs.

Most practices recover 20 to 35 percent more patient AR when a structured 30-60-90 day follow-up replaces ad hoc collections.

PR-1, PR-2, and PR-3 in Medical Billing: What Each Code Means and How They Differ

PR-1, PR-2, and PR-3 are the three most common patient responsibility codes , and the pr1 denial code is the highest-volume of the three in most outpatient billing departments your team encounters on every remittance. They often appear together on the same claim line.

Understanding each one and knowing how they combine is the difference between an accurate patient statement and one that creates disputes before you’ve even mailed it.

The PR-1, PR-2, PR-3 Comparison Table

See the X12 CARC official list for the complete official descriptions of all three codes. The pr1 pr2 pr3 in medical billing trio represents the full patient cost-sharing sequence in most commercial plans.

Understanding pr1 pr2 pr3 in medical billing is essential for any AR team posting ERA files daily. These three codes share the PR group code, which means all three are patient obligations that providers can legally bill directly.

When All Three Codes Appear on the Same Remittance

This scenario happens most often early in the plan year when a patient has a partial deductible remaining.

A claim might generate PR-1 for the last $80 of the patient’s deductible, PR-2 for 20% coinsurance on the remaining allowed amount after the deductible is satisfied, and a CO-45 denial code write-off for the difference between the billed charge and the allowed amount.

The patient owes the PR-1 amount plus the PR-2 amount. The provider writes off the CO-45 amount. The payer pays the remaining balance after all three adjustments. Your patient statement must show all three lines separately.

Combining them into a single “patient balance” without the itemized breakdown creates disputes because patients don’t understand where the number came from.

The pr 1 2 3 in medical billing pattern on the same remittance is the most common source of patient billing confusion in outpatient billing.

When billers work through pr1 pr2 pr3 in medical billing claims, the key is generating the statement with pr 01 and PR-2 as separate line items.

PR-1 and Secondary Insurance: Check Coordination of Benefits Before You Bill the Patient

Before you send a patient statement for any PR-1 balance, check whether the patient has secondary insurance. Secondary plans have different deductible rules than primary plans. Some cover the primary plan’s deductible partially or fully. Billing the patient before checking secondary is the most common collection mistake billing teams make on PR-1 denials.

Three Scenarios Where Secondary Insurance Covers the PR-1 Balance

Scenario 1: Medigap and Original Medicare. If your patient has Original Medicare as primary and a Medigap supplement as secondary, some Medigap plans cover the Medicare Part B deductible ($283 in 2026) automatically. Plan C and Plan F (legacy) Medigap plans covered the full Part B deductible. Plan G covers everything except the Part B deductible. Confirm the patient’s specific Medigap plan letter before billing the patient for any Medicare Part B PR-1 deductible. See the CMS Medigap plan coverage guide for plan letter specifics.

Scenario 2: Employer-Sponsored Dual Coverage. Some patients carry both their own employer plan and a spouse’s employer plan. The secondary plan may have a deductible coordination provision that pays after the primary. Bill secondary with the primary ERA attached and wait for secondary adjudication before billing the patient. The CO-45 denial code appears on the same remittance during COB processing , post it correctly alongside the PR-1 before billing either payer.

Scenario 3: Medicaid as Secondary. If the patient qualifies for Medicaid as secondary coverage, Medicaid may pay the patient’s cost-sharing obligations including deductibles. Bill Medicaid after the primary with the PR-1 amount documented. Medicaid billing has separate timely filing rules that are often shorter than commercial payers.

One O Seven RCM’s billing team checks secondary eligibility on every PR-1 balance before a single patient statement goes out, because secondary recoveries on deductible-assigned claims are the most underworked revenue stream in outpatient billing.

2026 Medicare Deductibles and How They Drive PR-1 Volume

Medicare deductibles increased in 2026, and that increase directly affects how much PR-1 volume your practice sees on Medicare claims. Higher deductibles mean more of the allowed amount gets assigned to the patient before Medicare pays its share.

Your team needs the correct 2026 figures before any Medicare pr1 in medical billing balance can be posted accurately.

Medicare Part B Deductible in 2026: $283

The annual deductible for all Medicare Part B beneficiaries is $283 in 2026. This represents an increase of $26 from the 2025 Part B deductible of $257. Per the CMS 2026 Medicare Part B deductible announcement, CMS published these figures on November 14, 2025.

For outpatient and physician services, PR-1 fires on Medicare claims until the patient has paid $283 toward the Part B deductible for the calendar year. After the deductible is satisfied, Medicare pays 80% of the allowed amount and PR-2 fires for the patient’s 20% coinsurance.

Most Medicare patients satisfy their Part B deductible early in the year, which means PR-1 denial code volume drops significantly after Q1 for Medicare providers. Your team should track which Medicare patients have met the $283 threshold so you’re not generating PR-1 patient statements for deductible amounts that have already been paid.

Medicare Part A Deductible in 2026: $1,736 Per Benefit Period

The Medicare Part A inpatient hospital deductible is $1,736 in 2026, an increase of $60 from $1,676 in 2025. This deductible applies per benefit period, not per calendar year.

A benefit period begins the day a patient is admitted to a hospital or skilled nursing facility and ends when they haven’t received inpatient care for 60 consecutive days.

PR-1 fires on Medicare Part A claims until the patient has satisfied the $1,736 benefit period deductible. If a patient is admitted in October, their benefit period deductible applies to that admission. If they’re readmitted in January, a new benefit period begins and a new $1,736 deductible applies.

Medicare Advantage Plan Deductibles and PR-1

Medicare Advantage (Part C) plans set their own deductibles, which vary by plan and change annually. Unlike Original Medicare with its fixed Part B deductible, MA plan deductibles can range from $0 to several thousand dollars depending on the plan design.

PR-1 on a Medicare Advantage claim reflects that plan’s specific deductible, not the Original Medicare Part B amount. See our CO-24 denial code guide for Medicare Advantage billing specifics.

Always verify the MA plan’s specific deductible for the current year through the plan’s eligibility portal before processing any MA PR-1. The $283 Part B figure doesn’t apply to MA claims.

See the official 2026 Medicare deductibles and costs page for the complete current-year figures.

One O Seven RCM’s billing team tracks annual Medicare deductible updates and payer-specific plan changes across your entire payer mix so your posting rules always reflect the correct cost-sharing figures for the current year. Check our medical billing services overview for how we maintain payer-specific posting rules.

How to Prevent PR-1 Denials From Becoming Patient Collection Problems

Most PR-1 patient collection problems aren’t billing errors. They’re workflow gaps that allow patients to receive care without knowing what they’ll owe. These prevention steps close those gaps at three points in the revenue cycle.

Front-End Prevention (Before the Appointment)

• Run real-time eligibility verification 24 to 48 hours before every scheduled appointment, not at check-in. Deductible status can change between the scheduling call and the service date. Use your prior authorization and eligibility verification workflow for every encounter.
• Confirm the patient’s year-to-date deductible accumulation from the payer portal during the pre-service eligibility check. Don’t rely on your billing system’s cached deductible balance.
• Communicate the expected patient responsibility to the patient before the visit. Tell them: “Your insurance shows $430 remaining on your deductible. Today’s visit will likely apply approximately $130 of that.”
• Verify whether the patient has secondary insurance that may cover the deductible. Collect that secondary payer information at scheduling if it’s not already in the system.
• Collect estimated patient responsibility at check-in for high-deductible visits. Collecting at point of service dramatically increases collection rates versus billing after the fact.

Mid-Cycle Prevention (Coding and Charge Capture)

• Audit ACA preventive service claims before submission to confirm screening diagnosis codes are used instead of diagnostic codes. Preventive codes must not generate PR-1.
• Verify the place of service code matches the payer’s benefit terms for each claim. Wrong POS codes can reclassify covered services as subject to deductible incorrectly.
• Flag HDHP patients in your practice management system so your front desk and billing team know to communicate expected patient responsibility before and after every visit.
• Check ICD-10 to CPT linkage for diagnosis-procedure pairs where payers apply coverage policies that reclassify services as deductible-subject.

Back-End Prevention (Posting and Patient Collections)

• Post PR-1 adjustments to patient AR the same day the ERA is received. Don’t let PR-1 patient balances sit in a denial queue with provider-side denials.
• Generate patient statements within 24 hours of posting the PR-1 adjustment. The fastest collection window is the first 30 days after service.
• Maintain a PR-1 patient balance aging report separate from your insurance AR. Patient AR ages differently and requires different follow-up workflows.
• Review January through March PR-1 volume monthly to confirm the deductible reset spike is being worked actively, not sitting in your AR aging bucket.

One O Seven RCM builds payer-specific prevention workflows for every denial code category, including PR-1, with separate front-end, mid-cycle, and back-end controls so patient responsibility revenue doesn’t leak out of your revenue cycle at any stage.

PR-1 vs Similar Denial Codes: How to Tell Them Apart Fast

PR-1 frequently appears alongside other codes on the same remittance. Knowing how each code differs from PR-1 prevents misposting, wrong patient billing, and misdirected appeals.

CO-45 is the code most commonly confused with PR-1 on remittance. CO-45 is always the provider’s write-off. PR-1 is always the patient’s obligation. Posting them wrong creates the most expensive billing errors in patient AR. See the CO-45 denial code and CO-50 denial code guides for the specific posting workflow for each.

Frequently Asked Questions About PR-1 Denial Code

What is a PR-1 denial code?

The PR-1 denial code is a Claim Adjustment Reason Code (CARC) used on the 835 ERA and EOB. The official X12 definition of CARC 1 is “Deductible Amount.” PR is the Patient Responsibility group code.

Together, PR-1 means the payer applied the claim charge to the patient’s annual deductible because it hasn’t been met yet. The patient owes this amount. The provider can bill the patient directly.

What does denial code 1 mean?

Denial code 1 is CARC 1 on the X12 claim adjustment reason code list, officially described as “Deductible Amount.” It means the payer applied part or all of the billed service’s allowed amount to the patient’s annual deductible.

The group code that precedes it (PR or CO) determines who owes the money. PR-1 means the patient owes. CO-1 means the provider writes it off.

What does PR mean if a claim is denied?

PR stands for Patient Responsibility. It’s one of four Claim Adjustment Group Codes defined by X12. When PR appears on a remittance adjustment, the patient is financially responsible for the adjusted amount. The provider can bill the patient.

This is the opposite of CO (Contractual Obligation), where the provider must write off the balance and cannot bill the patient.

How do I resolve a PR-1 denial?

Confirm the group code is PR (not CO). Verify the applied deductible amount matches the patient’s remaining balance on the payer portal. Check secondary insurance eligibility before billing the patient. Confirm the service wasn’t ACA-mandated preventive care.

If all checks confirm the denial is valid, generate a patient statement for the deductible amount within 24 hours of posting.

Is PR-1 patient responsibility?

Yes. PR-1 is the patient’s responsibility. The PR group code explicitly assigns the financial obligation to the patient. The provider can bill the patient for the deductible amount shown on the remittance. This is a legitimate patient balance, not a provider write-off.

What is the PR-1 denial code description?

The official pr 1 denial code description is “Deductible Amount,” as defined by X12 in the Claim Adjustment Reason Code (CARC) list maintained by the Washington Publishing Company. CARC 1 has been active since January 1, 1995.

The X12 CARC official list was last reviewed on May 1, 2026, and the code remains active with no changes to its description.

What is the difference between PR-1 and CO-1?

PR-1 and CO-1 use the same reason code (1, meaning Deductible Amount) but different group codes. PR-1 (Patient Responsibility) means the patient owes the deductible balance. The provider bills the patient. CO-1 (Contractual Obligation) means the provider absorbs the deductible as a write-off.

The patient cannot be billed. See the CO-45 denial code for the most common CO write-off that appears alongside PR-1.

What is the 2026 Medicare Part B deductible for PR-1 billing?

The 2026 Medicare Part B annual deductible is $283, an increase of $26 from $257 in 2025. CMS published this figure on November 14, 2025. PR-1 fires on Medicare Part B claims until the patient has paid $283 toward their annual deductible.

After the deductible is satisfied, Medicare pays 80% of the allowed amount and the patient owes 20% coinsurance, which appears as PR-2.

Can you appeal a PR-1 denial?

A valid PR-1 denial (where the deductible actually hasn’t been met) isn’t appealable in the traditional sense. You can dispute the deductible calculation if the payer applied the wrong amount.

You can submit a corrected claim if the service was miscoded as diagnostic when it should have processed as ACA preventive care. You can appeal if the secondary plan’s coordination of benefits should have covered the deductible.

What is PR-1 in medical billing for an HDHP?

In medical billing, pr 1 in medical billing fires most frequently on High Deductible Health Plan (HDHP) claims because HDHP deductibles can reach $9,450 for individuals in 2026 under IRS 2026 HDHP deductible limits.

HDHP patients often don’t meet their deductible until late in the plan year. PR-1 on an HDHP claim is valid and expected. Bill the patient for the applied deductible amount and offer a payment plan for large balances.