The behavioral health billing glossary

A 270/271 eligibility transaction is the standard HIPAA electronic inquiry and response that checks a patient's coverage, benefits, and patient responsibility with a health plan. The 270 request is sent by the provider or clearinghouse and the 271 response is returned by the payer or benefit administrator.

An 837 Claim Transaction is the HIPAA-standard electronic claim format used to submit professional, institutional, and dental claims to payers. The 837 file carries patient, provider, diagnosis, and service-line data from the practice management or billing system through the clearinghouse to the health plan.

Accounts Receivable (AR) is the total amount owed to a treatment center by payers and patients for services that have been billed but not yet collected. AR is usually tracked by aging bucket, payer, and financial class to manage cash flow and collection risk.

Allowed amount is the maximum dollar value a payer will consider for a covered service, based on the benefit plan and any contract, before patient cost sharing and contractual write-offs. Allowed amount sits between your gross charge and the actual payment, and drives both payer reimbursement and patient responsibility.

ASAM Criteria and Levels of Care are a nationally used clinical framework that defines severity and standardized levels of addiction treatment, from early intervention through intensive residential services. Payers and regulators rely on ASAM levels to set medical-necessity, prior-authorization, and coverage rules for substance use disorder services.

Assignment of benefits is the patient's written authorization that allows a health plan to pay the provider directly instead of reimbursing the patient. Assignment of benefits is usually captured as part of intake paperwork or in the signature-on-file fields of the claim.

Authorization denial is a payer decision to deny some or all claim lines because required prior authorization, precertification, or continued-stay approval was missing, expired, exceeded, or not documented correctly. Authorization denial can be technical, administrative, or clinical and often uses CARC codes such as CO-197 or CO-50.

Authorization span and units refer to the approved date range and quantity of services (days, visits, hours, or units) that a payer has authorized for a specific level of care or service. Authorization span controls when care is covered, and authorized units control how much care is covered before new approval is required.

Balance billing is the practice of billing a patient for the difference between a provider's charge and the payer's allowed amount or covered benefit. Balance billing is often limited or prohibited by payer contracts, Medicare and Medicaid rules, and surprise billing laws.

Benefits verification is the process of confirming a patient’s active coverage, financial responsibility, and authorization requirements with the payer before services are rendered. VOB can be manual (phone, fax, portal) or electronic (eVOB using 270/271 transactions or integrated portals).

A billing modifier is a 2-character code appended to a CPT or HCPCS code to describe a special circumstance, professional role, or delivery method that affects how payers process and pay a claim line. Billing modifiers do not change the underlying service, but they can change coverage, rate, or audit risk.

Bundling and unbundling describe how payers group multiple services into a single reimbursable unit or separate them into individually payable line items based on coding and medical policy. Correct handling of bundling logic prevents avoidable denials, underpayments, and audit exposure.

Capitation is a payment model where a payer pays a fixed amount per member per month to a provider or network, regardless of how many services that member actually uses. Behavioral health providers still submit encounters or claims, but payment is tied to the covered population, not to each individual service.

A behavioral health carve-out is a health plan design where mental health and substance use benefits are administered and paid by a separate company or division instead of the main medical payer. Behavioral claims must be verified, authorized, and billed to the carve-out entity, not the medical plan, or they will deny.

Case rate is a fixed payment amount that a payer agrees to pay for a defined episode or bundle of care, regardless of the number of individual services provided within that episode. Case rates sit between fee-for-service and capitation and are defined in the payer contract by service type, time window, and inclusions or exclusions.

A Certified Community Behavioral Health Clinic (CCBHC) is a provider organization that meets federal standards for delivering a defined set of coordinated behavioral health services and receives specialized Medicaid funding or grants tied to that status. CCBHCs are certified by states or tribes and often paid under prospective or enhanced rates that change how services must be billed and reported.

Charge capture is the process of turning documented clinical services into billable charges with the right codes, units, and dates so claims can be submitted and paid. Accurate charge capture connects clinical work to revenue and prevents missed, underbilled, or noncompliant charges.

Charge lag is the delay between when a service is provided and when the charge is entered or released to billing. Charge lag tracks how long revenue sits unbilled, which directly impacts cash flow and timely filing risk.

Claim Adjustment Reason Code (CARC) is a standardized code set defined by X12 that explains why a claim line or payment amount was adjusted on an electronic remittance (835) or paper remit. Each CARC provides the payer's specific reason for nonpayment, partial payment, or a financial adjustment.

Claim rejection is a failure of an electronic claim at the clearinghouse or payer front-end edit level so the claim never enters formal adjudication and does not generate an EOB or remittance. A rejected claim must be corrected and resubmitted, not appealed, and usually is not in accounts receivable yet.

Claim scrubbing is the automated and manual review of claims before submission to catch errors, missing data, and payer-specific issues that would cause rejections or denials. Claim scrubbing applies standardized and custom rules to claims so that the payer receives a clean, payable claim on the first pass.

Claims adjudication is the payer's internal process of reviewing a submitted claim, applying benefits and contract rules, and deciding whether to pay, deny, or pend each line. Claims adjudication produces the payment amounts, denial codes, and patient responsibility that show up on the remittance advice and EOB.

A claims appeal is a formal request that asks a payer to review and change a denial, reduction, or recoupment on a processed claim. A claims appeal uses additional information, clinical documentation, or contract terms to argue that the original payment decision was incorrect.

Clean Claim Rate is the percentage of submitted claims that pass payer and clearinghouse edits and can be paid without correction. The metric tracks how many claims are accepted on the first pass, with no rework needed.

A clearinghouse is a third-party EDI intermediary that receives electronic claims, checks and reformats them, then forwards them to payers and returns electronic responses. A clearinghouse often also handles eligibility checks, electronic remittances, and claim status transactions between providers and payers.

CMS-1500 is the standard paper claim form used by individual and group practitioners to bill professional services, typically submitted electronically as the 837P transaction. Behavioral health providers use CMS-1500 for outpatient therapy, medication management, and most non-facility services.

A commercial payer is a private health insurance company or employer-sponsored health plan that pays for services, as opposed to government programs like Medicare or Medicaid. Commercial payers include fully insured and self-funded plans, often administered by national carriers or third-party administrators.

Concurrent review is the payer's medical-necessity and authorization check that happens during an active episode of care, usually to decide whether to extend or stop approved days or units. In behavioral health it often controls continued coverage for inpatient, residential, PHP, IOP, and sometimes outpatient sessions.

Contractual adjustment is the portion of a provider's billed charges that is contractually not payable under a payer agreement and is written off as a permanent reduction in expected reimbursement. Contractual adjustments separate true disallowed amounts from collectible patient responsibility and prevent overstated accounts receivable.

Coordination of benefits (COB) is the process payers use to decide which plan pays first when a patient has more than one active policy, and how the remaining balance can be billed to other coverage. Coordination of benefits affects claim routing, payment order, and how much a behavioral health provider can collect from each payer and from the patient.

A corrected claim is a resubmission of a previously accepted claim that replaces the original with updated information, using payer-specific correction indicators rather than being sent as a new or appealed claim. Corrected claims are used when the provider was at fault for a billing or data error that affected how the claim adjudicated.

Cost sharing is the portion of allowed charges a member is contractually required to pay, usually as a copay, coinsurance, or deductible. Cost sharing is separate from non-covered amounts and directly drives patient-responsibility collection and financial counseling.

Cost to collect is the total revenue-cycle expense required to bring in one dollar of patient service cash. The metric is usually expressed as a percentage of cash collected or net patient service revenue.

A CPT code is a standardized five-character code that describes medical, surgical, and diagnostic services for billing and reporting. Behavioral health claims use CPT codes to describe services like therapy, psychiatry, and evaluation services so payers know what was done and how to pay it.

Credentialing is the process payers and facilities use to verify a provider's qualifications, enroll them, and approve them to see members. Credentialing must be complete and current before most behavioral health services can be billed and paid as in-network.

Days in AR (A/R Days) measures how many days of net charges remain unpaid in accounts receivable, based on current AR and recent charging volume. The metric shows how quickly a practice or facility converts billed charges into cash.

Denial rate is the percentage of submitted claims that are denied by payers during a defined period. The metric can be calculated based on claim counts or dollar amounts and is usually reported at first submission or across the full claim lifecycle.

Duplicate claim denial is a payer decision that a submitted claim or service line is a repeat of a previously received claim. The payer uses a denial code such as CARC CO-18 to indicate that the claim will not be paid again because an original claim is already on file or processed.

Electronic Funds Transfer (EFT) is an electronic payment method where payers deposit claim payments directly into a provider's bank account instead of issuing paper checks.

Explanation of Benefits (EOB) is the statement a health plan sends to a member that explains how a claim was processed, what the plan paid, and what the patient may owe. An EOB is not a bill, but it is the member-facing version of the claim outcome that providers see in a remittance advice.

External Review is a formal appeal where an Independent Review Organization (IRO) that is not the payer reviews a denial and issues a binding decision under state or federal rules. External Review typically follows an unsuccessful internal appeal and focuses on medical necessity, coverage rules, and parity compliance.

A fee schedule is a payer or contract document that lists the allowed amount the payer will consider for each billed code under specific conditions. In behavioral health, fee schedules often mix per-diem rates, per-session rates, and special rules for modifiers, locations, and levels of care.

Fee-for-service is a payment model where a payer reimburses each covered service separately, usually based on an agreed fee schedule or allowed amount. Behavioral health claims paid under fee-for-service are settled line by line, not as a bundled or capitated payment.

First-Pass Resolution Rate (FPRR) is the percentage of claims that are fully resolved on the first submission, with no rework, appeals, or additional touches required. Resolution includes payment as expected or an appropriate zero payment that needs no further follow up.

Gross collection rate is the percentage of gross charges that are collected as payments, without accounting for contractual adjustments or other write-offs. The metric is calculated by dividing total payments by total gross charges for the same period or cohort.

Group codes are high-level adjustment categories on remittance advice that indicate who is financially responsible for a claim adjustment or denial. The four standard group codes are CO (contractual), PR (patient responsibility), OA (other adjustment), and PI (payer initiated).

Group vs individual therapy billing is the process of coding, documenting, and submitting claims that distinguish between psychotherapy delivered to one patient individually and psychotherapy delivered to multiple patients in a group. Correctly classifying sessions affects CPT code selection, medical necessity review, reimbursement amounts, and audit risk in behavioral health programs.

A HCPCS code is a standardized alphanumeric code used to bill medical procedures, supplies, and services to Medicare, Medicaid, and many commercial payers, especially for non-physician and facility services. Behavioral health programs rely on HCPCS codes for per-diem levels of care, Medicaid-specific services, and many state-defined benefits.

ICD-10-CM diagnosis codes are standardized diagnosis codes used in the United States to describe patient conditions on claims, clinical documentation, and reporting. ICD-10-CM diagnosis codes drive coverage, medical-necessity decisions, and reimbursement for behavioral health services.

In-network vs out-of-network describes whether a provider has a contracted rate and terms with a health plan or bills as a non-contracted provider. Network status drives allowed amounts, patient cost share, authorization rules, and how claims adjudicate.

Intensive Outpatient Program (IOP) is a structured behavioral health or substance use treatment program that delivers multiple hours of therapy per day, several days per week, while the patient lives at home. IOP is typically billed as a distinct level of care with specific coverage rules, authorization requirements, and service limits.

Level of care criteria are the clinical and utilization rules payers use to decide whether a patient qualifies for a specific treatment intensity, such as inpatient, residential, PHP, IOP, or outpatient. Criteria drive prior authorization, concurrent review, and many medical-necessity and downgrade denials.

LOCUS and CALOCUS are structured behavioral-health assessment tools that score clinical severity and support level-of-care decisions for adults (LOCUS) and children and adolescents (CALOCUS). Many Medicaid programs and commercial behavioral-health carve-outs require LOCUS or CALOCUS scoring to justify authorization and payment for specific levels of care.

A Medicaid Managed Care Organization (MCO) is a private or nonprofit health plan that contracts with a state Medicaid agency to deliver Medicaid-covered services to enrolled members, usually for a fixed per-member-per-month payment. In behavioral health revenue cycle, a Medicaid MCO is the billed payer and follows plan-specific coverage, authorization, and billing rules that differ from fee-for-service Medicaid.

Medical necessity is the payer standard that a service must be clinically appropriate, consistent with accepted standards of care, and not primarily for convenience in order to be covered. Medical necessity is defined in federal and state rules and in individual payer policies, and it is the core reason behind many behavioral health authorization requirements and denials.

Medical necessity denial occurs when a payer refuses to pay all or part of a claim because the documented service does not meet that payer's clinical coverage criteria. Medical necessity denial is usually identified by specific CARC and RARC codes and often requires a clinical appeal to overturn.

Medicare is the federal health insurance program for people 65 and older and certain younger people with disabilities, administered by CMS and paid through regional Medicare Administrative Contractors. Medicare sets national coverage and billing rules that many commercial and Medicaid payers follow, so operational mistakes here ripple across your entire revenue cycle.

A Medicare-Medicaid crossover claim is a claim where Medicare, as the primary payer, automatically forwards its finalized claim and payment information to Medicaid or a Medicaid MCO for secondary payment on a dual-eligible patient. The crossover process is a form of coordination of benefits that is supposed to eliminate separate billing to Medicaid for Medicare cost sharing.

Mental Health Parity and Addiction Equity Act (MHPAEA) is a federal law that requires most group health plans and insurers to provide mental health and substance use disorder benefits on terms comparable to medical-surgical benefits. Mental health parity sets rules for financial requirements and treatment limits that payers must apply no more stringently than they do for physical health care.

National Provider Identifier is a 10-digit, HIPAA-required identification number assigned to health care providers and organizations in the United States. National Provider Identifier is used on claims, eligibility, and authorization transactions so payers can identify who rendered and who billed for services.

An NCCI edit is a CMS coding rule that prevents improper code combinations or units on the same claim, usually by bundling services or denying one of the codes. Many Medicare, Medicaid, and commercial plans load NCCI edits into their claims engines to control unbundling and overbilling.

Net collection rate is the percentage of allowed revenue actually collected from payers and patients, after contractual adjustments. Net collection rate shows how effectively a practice converts expected reimbursement into cash.

Out-of-pocket maximum is the most a member is required to pay in covered cost sharing (deductibles, copays, and coinsurance) during a benefit period before the health plan pays 100 percent of covered allowed charges. The out-of-pocket maximum applies only to covered services and usually resets each plan year.

Partial Hospitalization Program (PHP) is an intensive, structured outpatient level of care that provides multi-hour psychiatric and behavioral health services during the day as an alternative to inpatient hospitalization. PHP is usually billed as a per-diem or bundled service and has specific coverage, authorization, and documentation rules that strongly affect reimbursement.

A payer contract is the written agreement between a provider or treatment center and a health plan that sets rates, covered services, documentation rules, and operational requirements. The contract controls what the payer will pay, what can be billed, and the conditions for payment, even when benefits show as active.

Payer ID is the electronic identifier used in EDI transactions to route claims, eligibility checks, and remittances to the correct health plan or benefit administrator. Payer ID is usually a 5 to 7 character code that can differ by clearinghouse and by line of business, including behavioral health carve-outs.

Payer mix is the percentage breakdown of a provider's volume or dollars by payer category, such as commercial, Medicaid, Medicare, and self-pay. The metric shows how dependent a program is on each payer type and predicts reimbursement, denial patterns, and cash flow risk.

Peer-to-peer review is a clinician-to-clinician discussion between the treating provider and a payer-employed reviewer to argue for medical necessity, authorization, or level-of-care. Peer-to-peer review is usually time-limited and used to prevent or overturn a denial tied to medical necessity or authorization.

Per diem rate is a fixed daily payment amount that a payer agrees to reimburse for each covered day of a service episode, such as residential or PHP treatment. Per diem reimbursement replaces line-by-line fee schedules with a single daily rate that is governed by contract, authorization, and level of care.

A Place of Service (POS) code is a two-digit code on professional claims that identifies where a service was provided. POS codes drive how payers price claims, apply telehealth rules, and decide if a service is covered.

Prior authorization is a payer requirement to obtain approval before delivering specific services, confirming that planned care is medically necessary and covered under the member's benefit. Prior authorization is typically required for higher-cost, high-utilization, or ongoing treatment and is a common denial trigger when missing or expired.

Reconsideration is a payer review process where a provider asks the plan to re-review a claim determination without starting a full formal appeal. Reconsideration is usually used to correct errors, submit missing information, or contest a denial or underpayment within specific time limits set by the payer.

Recoupment, often called a takeback, is a payer process that recovers a prior overpayment by reducing or reversing current or future claim payments instead of sending a separate bill. Recoupment directly changes cash flow and accounts receivable because prior-period payments are pulled back on new remittances.

Remittance advice is the payer's official notice explaining how a claim was paid, adjusted, or denied, usually sent electronically in the HIPAA 835 format. An ERA lists allowed amounts, patient responsibility, payer write‑offs, and denial or adjustment codes for each claim and service line.

A Remittance Advice Remark Code is a standardized short code on an 835 remittance or paper EOB that explains why a payer paid, reduced, or denied a line item or claim. RARCs add narrative detail to Claim Adjustment Reason Codes and are critical for understanding payer decisions and fixing or appealing underpayments.

Rendering vs billing provider describes the separation between the individual clinician who actually delivers a service and the person or entity that submits the claim and receives payment. Correctly identifying both on each claim drives network eligibility, authorization matching, and audit exposure.

Residential Treatment (RTC) is a 24-hour behavioral-health level of care where patients live on site and receive structured clinical services but do not require acute inpatient hospital care. In revenue cycle terms, residential treatment usually bills on a per-diem basis and sits between inpatient hospitalization and partial hospitalization or intensive outpatient care.

Retroactive authorization is a payer approval for services that were already provided without required prior authorization or notification. It is usually granted as a one-time exception so the claim can be paid instead of denied for missing auth.

Revenue Code is a 3 or 4 digit code on institutional claims that identifies the type of accommodation, department, or service line that provided care. Revenue Code groups charges on UB-04 and 837I claims and drives how facility services are priced and paid.

Revenue Cycle Management (RCM) is the end to end process that turns clinical services into cash, from scheduling and eligibility through coding, billing, collections, and final payment or write off. RCM ties together people, workflows, technology, and payer rules so that care provided is accurately paid, on time, and defensible in an audit.

Room and Board in residential behavioral health is the non-clinical portion of care that covers lodging, meals, and basic facility services, usually rolled into a per-diem rate. Room and Board is typically billed on the UB-04 with specific revenue codes and is often subject to different coverage rules than therapy or medical services.

Single Case Agreement is a one-off contract between a payer and a provider that sets specific coverage and payment terms for a particular member and episode of care, often when the provider is out of network. Single Case Agreements define dates, services, and reimbursement rates that override the payer's standard out-of-network rules for that case.

A state behavioral health or substance abuse agency is the state government authority that oversees mental health and substance use services, funding, and policy, often called the Single State Agency (SSA). The agency may pay for care directly, control block-grant funding, manage carve-outs, or set rules that Medicaid managed care plans and providers must follow.

A superbill is a detailed, coded statement of services that a provider gives to a patient so the patient can submit an out-of-network claim to insurance. A superbill mirrors the key data from a CMS-1500 claim, including diagnoses, CPT codes, fees, and provider identifiers.

Telehealth modifiers 95 and 93 are CPT/HCPCS modifiers that indicate whether a billable service was delivered via real-time audio-video (95) or audio-only (93) telecommunication. Payers use these modifiers, along with place of service rules, to decide if behavioral health telehealth claims are covered and how they are paid.

Timely filing limit is the maximum time a payer allows between the date of service (or discharge) and receipt of an initial claim. Payers can legally deny claims submitted after this deadline, even if the service was covered and medically necessary.

UB-04 Claim Form (CMS-1450) is the standard institutional claim form that hospitals and facilities use to bill payers for services, including behavioral-health programs like residential, PHP, and IOP. The paper UB-04 mirrors the electronic 837I claim and captures facility, revenue code, per-diem, and stay-level details that are not on a CMS-1500.

Utilization review (UR) is the clinical and administrative process payers and providers use to decide whether services are medically necessary, at the right level of care, and for how long. Utilization review drives prior authorizations, concurrent reviews, day limits, and many medical-necessity denials.

Value-based care is a set of payment models that tie reimbursement to quality and cost outcomes instead of only paying per unit of service. Payers pay more for meeting defined clinical and cost targets, and may pay less or recoup funds when performance falls short.

Withdrawal management (detox) is the medically supervised or clinically managed process of helping a patient safely stop using alcohol or other drugs and manage withdrawal symptoms. In behavioral health billing, withdrawal management is a distinct level of care with its own coverage rules, authorizations, and coding patterns that often differ from standard residential or inpatient treatment.

Write-off is the accounting step that removes part or all of a balance from accounts receivable because it is not expected to be collected from a payer or patient. Write-offs can be contractual, based on payer fee schedules, or non-contractual, caused by denials, policy decisions, or bad debt.