CO-180 is issued when a payer denies or adjusts a claim because the patient hasn't met their required deductible or spending commitment under the plan. The CO group code signals a contractual write-off — but the critical first step is verifying whether CO-180 was applied correctly, because on most standard commercial plans, the deductible is patient-responsible (PR-1), not a provider write-off.
CO-180 means the patient hasn't met their deductible, and the payer is applying the claim to the deductible. The CO group code technically means the balance is a provider write-off — but always verify this is correct for the plan type before writing anything off. On most standard commercial plans, the deductible is the patient's responsibility (PR-1). If you see CO-180 instead of PR-1 on a commercial claim, the payer may have miscoded the group code — and you may be entitled to collect the deductible from the patient after requesting reprocessing.
CO-180 on a commercial PPO, HMO, or HDHP claim is often a payer processing error — the deductible should appear as PR-1 (patient responsibility), not CO (provider write-off). Writing off the balance based on CO-180 without verifying means you've given away revenue you are contractually entitled to collect from the patient. Call the payer, confirm whether the balance is truly a contractual write-off or whether it should be patient-responsible, and request reprocessing with the correct group code if needed.
Check your payer contract for this specific plan. If the contract doesn't say anything about absorbing deductibles, the payer should be using PR-1. Request reprocessing if you receive CO-180 on a plan where the patient has deductible responsibility.
| Plan Type | Deductible Group Code | Patient Billable? | Notes |
|---|---|---|---|
| Commercial PPO / HMO / EPO | PR-1 | Yes | Standard deductible is patient responsibility. CO-180 on this claim type is likely a payer error — request reprocessing. |
| High-Deductible Health Plan (HDHP) with HSA | PR-1 | Yes | HDHP deductibles can be $1,600–$8,000+ (2026). Patient pays from HSA or out of pocket. Always PR-1 — deductible is core to the plan design. |
| Medicare Part A (Inpatient) | PR-1 | Yes (unless Medigap) | 2026 Part A deductible: $1,676 per benefit period. If patient has a Medigap supplement, the supplement may pay PR-1 amount, but the group code is still PR-1 on the primary EOB. |
| Medicare Part B (Outpatient) | PR-1 | Yes (unless Medigap) | 2026 Part B deductible: $257 annually. PR-1 on Medicare claims. Medigap Plan G covers this; Plan N does not. |
| Medicaid (fee-for-service) | CO-180 or PR-1 | State-dependent | Federal law limits Medicaid cost-sharing severely. Most Medicaid FFS programs prohibit or severely limit deductibles for low-income patients. CO-180 may correctly appear on Medicaid claims where collection is prohibited. |
| Medicaid Spend-Down / Medically Needy | Verify | Patient's spend-down amount only | Medicaid spend-down is a unique structure where the patient must meet an "income deductible" (spend-down) before Medicaid pays. The spend-down amount may appear as CO-180 in some payer systems. Complex — verify with the specific state Medicaid program. |
| Capitated / Global Budget Contract | CO-180 | No — provider absorbs it | Under full-risk capitation, providers receive a per-member-per-month payment and absorb patient cost-sharing. CO-180 in this context is correct — the deductible is within the capitated write-off. |
| 100% Employer-Paid Benefit Plan | CO-180 | No — employer covers it | Some employer plans pay 100% of cost-sharing (zero deductible for the employee). CO-180 applies when the plan design has a deductible that the employer absorbs, not the patient. |
Most plans have both an individual deductible (per member) and a family deductible (aggregate). Once the family deductible is met, additional family members' services are covered at the plan's cost-sharing rate. Always verify whether you're applying against individual or family accumulator.
Embedded: each family member has their own individual deductible plus the family deductible. Non-embedded (aggregate): the entire family shares one deductible with no individual cap. Non-embedded HDHPs can mean one family member bears the entire deductible burden.
Deductibles reset at the start of the plan year, which is not always January 1. An employer group plan on a July 1 plan year resets its deductible July 1. Verify the plan year start date when reviewing accumulators — a December service on a July plan year is late in the deductible year, not the beginning.
Most plans have separate in-network and out-of-network deductibles. The OON deductible is typically higher, and amounts paid toward the OON deductible may not count toward the in-network deductible (and vice versa). Always confirm which deductible applies based on your network status with this payer.
Some payers now use "accumulator adjustment programs" that exclude manufacturer copay assistance (for specialty drugs) from counting toward the deductible. If a patient uses a manufacturer copay card, the payer's accumulator may show less credited than the patient thinks — which can generate unexpected CO-180 / PR-1 balances at the pharmacy.
On HDHPs with HSAs, services before the deductible is met are generally the patient's full responsibility — no plan discount until the deductible is met (except preventive care, which is ACA-exempt from deductibles). After the deductible is met, coinsurance applies. Knowing where the patient is in the deductible cycle is critical for point-of-service collections.
A payer applying CO-180 when PR-1 is correct costs you every time a patient's deductible balance silently becomes a write-off. A free RCM audit identifies which payers are miscoding group codes on your claims, helps you request reprocessing for affected claims, and builds the front-end deductible collection workflow that captures patient responsibility at time of service — not after the EOB.