The allowed amount is one of the most misunderstood concepts in medical billing yet it affects nearly every claim you submit. If you’ve ever wondered why your practice gets paid less than what you billed, or why patients sometimes owe more than expected, the allowed amount is almost always the answer.
In this complete guide, you will learn exactly what the allowed amount is, how it differs from billed and paid amounts, what a contractual adjustment means, and how patient responsibility is calculated. You will also find practical examples, payer-specific explanations, and answers to frequently asked questions.
What Is the Allowed Amount in Medical Billing? (Simple Definition)
The allowed amount (also called the allowable amount, contracted rate, or payment allowance) is the maximum dollar amount an insurance payer will pay for a covered healthcare service. Think of it as the payer’s answer to your bill.
For example, if you charge $200 for an office visit and the allowed amount is $110, the payer will not pay more than $110 regardless of what you billed. The remaining $90 is typically written off as a contractual adjustment if you are an in-network provider.
Under HIPAA regulations, the allowed amount is formally defined as “the maximum amount determined by the payer as being allowable under the provisions of the contract prior to the determination of actual payment”. In simpler terms, it is the payer’s predetermined price for a specific CPT or HCPCS code.
Billed Amount vs. Allowed Amount vs. Paid Amount: Key Differences
These three terms are often confused, but each plays a distinct role in the revenue cycle.
| Term | Definition | Who Sets It |
| Billed Amount | The full charge the provider lists on the claim for each service | Provider |
| Allowed Amount | The maximum the payer agrees to consider for a covered service | Payer (via contract or fee schedule) |
| Paid Amount | The actual reimbursement the provider receives after patient cost-sharing and adjustments | Payer (after calculations) |
How they relate:
- Billed amount → Allowed amount → Contractual adjustment (write-off) → Patient responsibility → Paid amount
Example: You bill $200. The allowed amount is $110. The patient has a $30 copay and 20% coinsurance. The paid amount to the provider would be the allowed amount minus patient responsibility.
Contractual Adjustment: The Difference You Cannot Bill the Patient
The contractual adjustment (also called contractual allowance) is the difference between what you bill and the allowed amount. When you sign a contract with an insurance payer, you agree to accept the allowed amount as payment in full. You cannot bill the patient for the difference between your charge and the allowed amount.
Example: You bill $200. The allowed amount is $110. The contractual adjustment is $90. You must write off this $90. It never becomes patient responsibility.
On your remittance advice (ERA), contractual adjustments are typically identified with the adjustment code CO (Contractual Obligations), which represents the amount contractually required to be adjusted from the claim.
Patient Responsibility: Copays, Deductibles, and Coinsurance
Patient responsibility is the portion of the allowed amount that the patient must pay never the billed amount. Patient costs copays, coinsurance, and deductibles are always calculated on the allowed amount, not your billed charge.
How Each Component Works
Deductible: The amount the patient must pay out-of-pocket before insurance starts paying. The allowed amount first applies toward any remaining deductible.
Coinsurance: A percentage of the allowed amount that the patient pays after the deductible is met (e.g., 20% of the allowed amount).
Copay: A fixed dollar amount the patient pays for a specific service (e.g., $30 per office visit).
Sample Calculation
| Step | Calculation |
| Allowed amount | $110 |
| Copay | $30 |
| Remaining allowed amount after copay | $110 − $30 = $80 |
| Coinsurance (20% of $80) | $16 |
| Total patient responsibility | $30 + $16 = $46 |
| Payer reimbursement | $110 − $46 = $64 |
The provider receives $64 from the payer plus $46 from the patient, totaling the full allowed amount of $110.
In-Network vs. Out-of-Network: How Allowed Amounts Differ
Your network status with a payer significantly changes how the allowed amount applies and what you can collect.
In-Network Providers
- The allowed amount is a negotiated rate established in your contract.
- You are contractually obligated to accept the allowed amount as full payment.
- You cannot balance bill the patient for any amount above the allowed amount.
- The payer processes the claim according to your contract.
Out-of-Network Providers
- There is no pre-negotiated allowed amount.
- The payer determines an allowed amount based on factors such as usual, customary, and reasonable (UCR) rates, Medicare rates, or their internal fee schedule.
- The allowed amount may be significantly lower than your charge.
- You may be able to balance bill the patient for the difference, subject to state and federal laws (see No Surprises Act below).
How Different Payers Calculate Allowed Amounts
Allowed amounts are not universal. Each payer uses its own methodology.
Medicare
Medicare uses a standardized formula called the Physician Fee Schedule (PFS) . The allowed amount is calculated as:
Allowed Amount = (RVU × GPCI × CF)
Where:
- RVU = Relative Value Unit (work, practice expense, malpractice)
- GPCI = Geographic Practice Cost Index (local cost adjustment)
- CF = Conversion Factor (national dollar multiplier, updated annually)
In 2026, Medicare beneficiaries typically pay 20% coinsurance of the Medicare-approved amount after meeting their deductible. The standard Part B premium for 2026 is $202.90 per month.
Commercial Payers (e.g., Blue Cross, UnitedHealthcare, Aetna, Cigna)
- Each payer maintains its own fee schedule.
- Allowed amounts are negotiated between the payer and provider or provider group.
- Rates vary significantly by geography, specialty, and contract terms.
Medicaid
- Each state sets its own fee schedules and reimbursement methodologies.
- Allowed amounts are typically much lower than Medicare or commercial rates.
- Some states use a percentage of Medicare rates as their baseline.
For official Medicare fee schedule information, visit the CMS Physician Fee Schedule.
Balance Billing and the No Surprises Act
Balance billing occurs when a provider bills a patient for the difference between their charge and the allowed amount (or the amount paid by insurance).
For in-network providers, balance billing is generally prohibited. For out-of-network providers, balance billing has been significantly restricted by the No Surprises Act (effective January 1, 2022) and similar state laws.
Under the No Surprises Act:
- Providers cannot bill patients for amounts above the in-network cost-sharing amount for covered services in emergency situations or certain non-emergency settings.
- The patient must not be balance-billed beyond in-network cost-sharing amounts.
- Providers must notify patients of out-of-network status and obtain written consent if billing beyond in-network rates.
As of 2026, new proposed rules continue to strengthen these protections, including updated patient notices clarifying that out-of-network providers “may” balance bill only where permitted by law.
Complete Walkthrough Example
Let’s walk through a full claim from billed amount to final payment.
Scenario: A patient with an in-network PPO plan sees their primary care physician. The plan has a $500 remaining deductible, 20% coinsurance, and a $30 copay for office visits.
| Step | Amount | Explanation |
| Provider bills | $200 | Full charge for the visit |
| Allowed amount | $110 | Contracted rate (payer’s fee schedule) |
| Contractual adjustment | $90 | $200 − $110 = $90 (write-off) |
| Remaining deductible | $500 | Patient has not met deductible yet |
| Deductible applied | $110 | Entire allowed amount applies to deductible (since deductible > allowed amount) |
| Patient owes (deductible) | $110 | Provider must collect $110 from patient |
| Copay | $0 | Not applicable (deductible not yet met) |
| Coinsurance | $0 | Not applicable (deductible not yet met) |
| Total patient responsibility | $110 | Patient pays full allowed amount |
| Payer reimbursement | $0 | Insurance pays nothing until deductible is met |
If the patient had already met their deductible:
- Allowed amount: $110
- Copay: $30
- Coinsurance (20% of remaining $80): $16
- Patient pays: $46
- Payer pays: $64
Summary Table: Key Terms at a Glance
| Term | Definition | Who Bears It |
| Billed Amount | Provider’s full charge for a service | — |
| Allowed Amount | Maximum the payer will pay (contracted rate) | — |
| Contractual Adjustment | Difference between billed and allowed amounts | Provider (write-off) |
| Deductible | Amount patient pays before insurance starts | Patient |
| Coinsurance | Percentage of allowed amount patient pays after deductible | Patient |
| Copay | Fixed dollar amount patient pays per service | Patient |
| Paid Amount | Actual reimbursement provider receives | Provider |
Frequently Asked Questions (FAQs)
1. What is the allowed amount in medical billing?
The allowed amount is the maximum dollar amount an insurance payer will pay for a covered healthcare service. It is the negotiated rate between the provider and the payer for in-network claims.
2. What is the difference between billed amount and allowed amount?
The billed amount is what the provider charges. The allowed amount is what the payer agrees to pay. The difference is a contractual adjustment that the provider must write off and cannot bill to the patient.
3. Can I bill a patient for the difference between billed and allowed amounts?
No, if you are an in-network provider. You are contractually obligated to accept the allowed amount as payment in full. The difference is a contractual adjustment, not patient responsibility.
4. How is patient responsibility calculated from the allowed amount?
Patient responsibility = allowed amount × coinsurance percentage + copay + any remaining deductible amount. Patient costs are always calculated on the allowed amount, not the billed charge
5. Does the allowed amount differ for in-network vs. out-of-network providers?
Yes. In-network providers have a pre-negotiated allowed amount. Out-of-network providers do not; the payer determines an allowed amount after claim submission, often based on UCR rates or Medicare.
6. What is balance billing and is it legal?
Balance billing is when a provider bills a patient for the difference between their charge and what insurance paid. For in-network providers, it is generally prohibited. For out-of-network providers, the No Surprises Act has significantly restricted balance billing in emergency and certain non-emergency settings.
7. Where can I find a payer’s allowed amount for a specific CPT code?
Review your payer contract or fee schedule. For Medicare, use the CMS Physician Fee Schedule lookup tool. For commercial payers, contact your provider relations representative or check your payer portal.
Final Thoughts
The allowed amount is the foundation of healthcare reimbursement. Understanding it helps you set accurate patient expectations, post payments correctly, and maintain compliance with payer contracts. The key takeaways are simple: always verify allowed amounts for the codes you bill most frequently, never bill patients for contractual adjustments, and stay current with balance billing laws like the No Surprises Act.
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