Medical Billing Terms I: Incident-To Billing, ICD-10-CM and In-Network Terms

Incident-to billing lets certain services by clinical staff be billed under a supervising provider when strict conditions are met. This page defines it with the terms from ICANotes to interoperability, including ICD-10-CM, IOP, informed consent and in-network. Each entry gives a plain definition, why it matters, an example, and an official source. MCM South Medical Billing Service, LLC works only in mental and behavioral health billing.

Last reviewed: October 10, 2026Sources linked at each term

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Billing Terms Glossary slide, Terms I: Incident-To Billing - MCM South Medical Billing Service, LLC

Glossary pages

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On this page (23 terms)

ICANotes
ICD-10-CM
Illinois HealthChoice
In Loco Parentis
Incident-To Billing
Independence Blue Cross
Indian Health Service (IHS)
Information Blocking
Informed Consent
In-Home Therapy
Initial Authorization
Initial Credentialing
In-Network
In-Person Requirement (Medicare Mental Health)
InstaMed
Institutions for Mental Diseases (IMD) Exclusion
Insurance Card
InSync
Intensive Outpatient Program (IOP)
Interactive Complexity (90785)
Internal Appeal
Internal Control Number (ICN)
Interoperability

How to use these Incident-To Billing definitions

Use this page as a quick reference for Incident-To Billing, from ICANotes to Interoperability. Each entry gives a plain definition, why it matters to a mental health practice, and an official source. When a rule changes by payer or state, the entry says so, so confirm Incident-To Billing details with the payer before you bill.

Checklist: put the incident-to billing definitions to work

Check the incident-to billing entries above before you send a claim that depends on them.
Share this incident-to billing page with front-desk and billing staff so everyone works from the same definitions.
When a payer letter mentions incident-to billing, find the matching entry and note the date you checked it.
Keep your incident-to billing notes next to your payer contracts, because a contract can define a term differently.
Ask the payer to confirm in writing how it applies incident-to billing before you change a workflow.
Train new staff on incident-to billing first, then move on to the rest of the glossary.

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ICANotes

General (all payers)

Also called ICANotes EHR

Definition: A behavioral health EHR vendor offering documentation and billing tools. Listed for reference; not an endorsement or partnership.
Why it matters: Common among behavioral health practices.
Illustrative example: A psychiatrist documents in ICANotes.

Reference sourceICANoteschecked 10/9/26

CategoriesEHR & Healthcare Technology Terms

ICD-10-CM

General (all payers)

Also called ICD-10; diagnosis code; ICD-10-CM code

Definition: The diagnosis code set used in U.S. outpatient settings, maintained by CMS and the National Center for Health Statistics. Mental health diagnoses are in the F chapter.
Why it matters: The diagnosis code supports medical necessity for the CPT code billed.
Illustrative example: A claim lists F41.1 as the diagnosis for a patient's therapy visits.

Reference sourceCMS (Centers for Medicare & Medicaid Services)CMS ICD-10checked 10/9/26

CategoriesClaims Processing Behavioral Health Specific Terms

Illinois HealthChoice

Medicaid (state-specific)

Also called HealthChoice Illinois; HCI; Illinois Medicaid managed care

Definition: HealthChoice Illinois (HCI) is the name of Illinois' Medicaid managed care program, run by the Illinois Department of Healthcare and Family Services (HFS) through contracted managed care plans.
Why it matters: Illinois is a served state; its plans, rules, and codes are separate from other states.
Illustrative example: An Illinois provider checks the HFS site for the current plans before contracting or billing.

Reference sourceIllinois Department of Healthcare and Family Services (HFS)checked 10/9/26

CategoriesMedicare & Medicaid Terms BCBS, UHC & Commercial Payer Terms

In Loco Parentis

State law (varies by state)

Also called person acting in place of a parent; acting in loco parentis

Definition: In loco parentis is a Latin phrase for a person who acts in the place of a parent. HHS names such a person, along with parents and guardians, as a possible personal representative of a minor child.
Why it matters: A caregiver who is not a legal parent or guardian may still act in this role in some situations, but only if state law recognizes it. Ask for proof, such as a court order, before releasing records or discussing care.
Illustrative example: A grandmother who has raised a patient brings a court order that shows she acts in loco parentis, and the practice files it before sharing information.

Reference sourceHHS, Personal Representatives (HIPAA)checked 10/9/26

CategoriesAudits & Compliance Behavioral Health Specific Terms

Incident-To Billing

General (all payers)

Also called incident to; incident-to services

Definition: A Medicare rule that lets certain services of non-physician staff be billed under a supervising physician when specific conditions are met. Commercial payers often differ.
Why it matters: Misusing incident-to is an audit and repayment risk, so payer policy must be confirmed.
Illustrative example: A physician's practice bills a staff member's service under the physician only where the payer's incident-to rules are met.

Reference sourceCMS (Centers for Medicare & Medicaid Services)checked 10/9/26

CategoriesClaims Processing Medicare & Medicaid Terms

Independence Blue Cross

Private payer

Also called IBX

Definition: A Blue licensee serving southeastern Pennsylvania.
Why it matters: A separate licensee with its own rules.
Illustrative example: A Pennsylvania provider uses IBX's provider site.

Reference sourceIndependence Blue Crosschecked 10/9/26

CategoriesBCBS, UHC & Commercial Payer Terms

Indian Health Service (IHS)

Medicaid (state-specific)

Also called IHS; tribal health programs

Definition: A federal agency that provides health services to American Indian and Alaska Native people, with its own billing and referral rules.
Why it matters: Has special payer status rules and purchased/referred care processes.
Illustrative example: A provider bills IHS through a purchased/referred care authorization.

Related termsMedicaid Prior Authorization

Reference sourceIndian Health Servicechecked 10/9/26

CategoriesMedicare & Medicaid Terms

Information Blocking

General (all payers)

Also called 21st Century Cures Act information blocking

Definition: A practice that is likely to interfere with access, exchange, or use of electronic health information, prohibited under federal rules with exceptions.
Why it matters: Affects how practices respond to record requests and EHR access.
Illustrative example: A practice delays giving a patient their records without a valid exception.

Related termsInteroperability HIPAA

Reference sourceHHS (U.S. Department of Health and Human Services)checked 10/9/26

CategoriesEHR & Healthcare Technology Terms Audits & Compliance

In-Home Therapy

General (all payers)

Also called home-based therapy; in-home behavioral health; community-based therapy

Definition: Behavioral health services delivered in a patient's home or community, often under Medicaid programs, with distinct codes, authorization, and documentation.
Why it matters: Rules on codes and place of service vary by state and plan.
Illustrative example: A state program authorizes in-home therapy for children.

Reference sourceMedicaid.govchecked 10/9/26

CategoriesBehavioral Health Specific Terms Medicare & Medicaid Terms

Initial Authorization

General (all payers)

Also called first authorization; initial approval

Definition: The first approval for a course of care, often for a limited number of units.
Why it matters: Followed by concurrent review for more units.
Illustrative example: A payer approves the first six sessions.

Reference sourceCMS (Centers for Medicare & Medicaid Services)checked 10/9/26

CategoriesPrior Authorization Terminology

Initial Credentialing

General (all payers)

Also called new provider credentialing; initial application

Definition: The first full credentialing review of a clinician by a payer, before the clinician's first in-network effective date.
Why it matters: It sets the effective date that decides which dates of service can be billed in-network.
Illustrative example: A psychiatrist joins a group and the group files initial applications with each payer.

Reference sourceNCQAchecked 10/9/26

CategoriesCredentialing & Enrollment

In-Network

General (all payers)

Also called in network; network provider

Definition: Describes a provider or facility with a contract with the patient's plan, so the patient pays in-network cost sharing.
Why it matters: Patients and payers use the term to decide costs; practices must confirm status per plan, not per payer name.
Illustrative example: A patient's plan lists a therapist as in-network under its PPO but not under its HMO product.

Reference sourceCMS (Centers for Medicare & Medicaid Services)checked 10/9/26

CategoriesContracting & Network Management Eligibility & Benefits

In-Person Requirement (Medicare Mental Health)

General (all payers)

Also called in-person visit requirement; six-month in-person rule

Definition: A Medicare rule that has required an in-person visit within a set period for certain mental health telehealth services, with timing and exceptions subject to change.
Why it matters: Missing an in-person requirement can jeopardize payment.
Illustrative example: A provider schedules an in-person visit before the deadline.

Reference sourceCMS (Centers for Medicare & Medicaid Services)checked 10/9/26

CategoriesTelehealth Terms Medicare & Medicaid Terms

InstaMed

General (all payers)

Also called InstaMed payments

Definition: A health care payments company, part of J.P. Morgan, offering payer and provider payment delivery and patient payment tools. Listed for reference; not an endorsement or partnership.
Why it matters: Some payers and providers use it for payments and remittances.
Illustrative example: A payer delivers ERA and EFT through InstaMed.

Reference sourceInstaMedchecked 10/9/26

CategoriesPayment & Reimbursement

Institutions for Mental Diseases (IMD) Exclusion

Medicaid (state-specific)

Also called IMD exclusion; Medicaid IMD rule; IMD waiver

Definition: The IMD exclusion is a Medicaid rule that generally bars federal Medicaid payment for services for adults age 21 to 64 in an institution for mental diseases, which is a facility of more than 16 beds primarily engaged in treating mental illness or substance use disorders. States can seek waivers and other exceptions.
Why it matters: It affects coverage for residential and inpatient behavioral health care in Medicaid. Coverage and exceptions vary by state.
Illustrative example: A state uses a waiver to pay for short-term residential treatment despite the IMD rule.

Reference sourceMedicaid.gov CMS (Centers for Medicare & Medicaid Services)checked 10/9/26

CategoriesMedicare & Medicaid Terms Behavioral Health Specific Terms

Insurance Card

General (all payers)

Also called ID card; member card

Definition: The card a member carries showing payer name, member ID, group number, and often billing addresses and phone numbers.
Why it matters: Both sides must be collected at intake; the back often shows the behavioral health contact.
Illustrative example: A practice scans both sides of the card at intake.

Reference sourceCMS (Centers for Medicare & Medicaid Services)checked 10/9/26

CategoriesEligibility & Benefits

InSync

General (all payers)

Also called InSync Healthcare Solutions

Definition: A vendor of EHR and practice management software for behavioral health practices. Listed for reference; not an endorsement or partnership.
Why it matters: Used by some behavioral health groups.
Illustrative example: A group uses InSync for scheduling and billing.

Reference sourceInSync Healthcare Solutionschecked 10/9/26

CategoriesEHR & Healthcare Technology Terms

Intensive Outpatient Program (IOP)

General (all payers)

Also called IOP; intensive outpatient

Definition: A structured behavioral health program that provides several hours of treatment per week without an overnight stay.
Why it matters: Billed with specific codes and authorization, often by revenue code or HCPCS, and payer rules differ.
Illustrative example: A payer authorizes IOP for three days a week.

Reference sourceSAMHSAchecked 10/9/26

CategoriesBehavioral Health Specific Terms

Interactive Complexity (90785)

General (all payers)

Also called 90785; interactive complexity add-on

Definition: A CPT add-on code for psychiatric diagnostic or psychotherapy services when specific communication factors make the service more complex.
Why it matters: Payers audit it; it applies only when documented factors are met.
Illustrative example: A session involves a third party with conflict that complicates the service.

Reference sourceAmerican Medical Association (AMA)checked 10/9/26

CategoriesClaims Processing Behavioral Health Specific Terms

Internal Appeal

General (all payers)

Also called plan internal review; first-level plan appeal

Definition: A member or provider appeal handled inside the health plan, the first step under many plans and laws.
Why it matters: Exhausting internal appeals is usually required before external review.
Illustrative example: A plan upholds its denial on internal appeal.

Related termsExternal Review Appeal

Reference sourceCMS (Centers for Medicare & Medicaid Services)checked 10/9/26

CategoriesDenials & Appeals

Internal Control Number (ICN)

General (all payers)

Also called ICN; claim control number; DCN; payer claim number

Definition: The identifier a payer assigns to a claim when it receives it, used to reference the claim on calls, appeals, and corrected claims.
Why it matters: Needed for replacement and void claims and for follow-up.
Illustrative example: A corrected claim lists the original payer claim number.

Reference sourceCMS (Centers for Medicare & Medicaid Services)checked 10/9/26

CategoriesClaims Processing EDI & Clearinghouse Terms

Interoperability

General (all payers)

Also called health information exchange; data exchange

Definition: The ability of systems to exchange and use health information.
Why it matters: Enables data sharing between EHRs, payers, and other systems.
Illustrative example: An EHR shares data with a payer through an API.

Related termsFHIR HL7 TEFCA

Reference sourceHL7 International HL7 FHIRchecked 10/9/26

CategoriesEHR & Healthcare Technology Terms EDI & Clearinghouse Terms

Quick answer: Incident-To Billing

What is incident-to billing?

A Medicare rule that lets certain services of non-physician staff be billed under a supervising physician when specific conditions are met. Commercial payers often differ. Misusing incident-to is an audit and repayment risk, so payer policy must be confirmed.

Frequently asked questions: Incident-To Billing

What is ICD-10-CM?

ICD-10-CM is the diagnosis code set used in U.S. outpatient settings, maintained by CMS and the National Center for Health Statistics. Mental health diagnoses are in the F chapter. The diagnosis code supports medical necessity for the CPT code billed.

What is an intensive outpatient program (IOP)?

Intensive Outpatient Program (IOP) is a structured behavioral health program that provides several hours of treatment per week without an overnight stay. Billed with specific codes and authorization, often by revenue code or HCPCS, and payer rules differ.

What does in-network mean?

Describes a provider or facility with a contract with the patient's plan, so the patient pays in-network cost sharing. Patients and payers use the term to decide costs; practices must confirm status per plan, not per payer name.

Related resources

Where MCM South works

MCM South serves psychotherapists and psychiatrists in ten states: Georgia, Massachusetts, Connecticut, Texas, Florida, New York, Colorado, Tennessee, North Carolina and Illinois.

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