Medical Billing Terms G: Claim Group Codes CO, PR, OA and PI and Other G Terms

Claim group codes CO, PR, OA and PI tell you who owes an adjusted amount on a payer remittance. This page defines the four group codes and the terms from GAD-7 to guarantor, including gold carding, good faith estimate and group NPI. 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

Get a Free Quote Schedule a Consultation

Billing Terms Glossary slide, Terms G: Claim group codes - MCM South Medical Billing Service, LLC

Glossary pages

0-9 A B C D E FGH I J K-L M N-O P Q-R S T U-V W-Z

On this page (22 terms)

GAD-7
Gap Exception
Gatekeeper
Generative AI
Geographic Practice Cost Index (GPCI)
Georgia Families
Georgia Pathways
Ghost Network
Gold Carding
Good Faith Estimate (GFE)
Grace Period (Coverage)
Greenway Health
Gross Collection Rate (GCR)
Group Code CO
Group Code OA
Group Code PI
Group Code PR
Group Enrollment
Group NPI
Group Number
Group Psychotherapy (90853)
Guarantor

How to use these Claim group codes definitions

Use this page as a quick reference for Group codes CO PR OA PI, from GAD-7 to Guarantor. 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 Group codes CO PR OA PI details with the payer before you bill.

Checklist: put the claim group codes definitions to work

Check the claim group codes entries above before you send a claim that depends on them.
Share this claim group codes page with front-desk and billing staff so everyone works from the same definitions.
When a payer letter mentions claim group codes, find the matching entry and note the date you checked it.
Keep your claim group codes notes next to your payer contracts, because a contract can define a term differently.
Ask the payer to confirm in writing how it applies claim group codes before you change a workflow.
Train new staff on claim group codes first, then move on to the rest of the glossary.
Log any claim group codes question that comes up twice, then add the answer to your billing procedures.
Use the source links under the claim group codes entries to confirm the current rule.
Print the claim group codes entries you use most and keep them at the billing desk.
Review your claim group codes notes each quarter, because payer and CMS rules change.
Mark where claim group codes work differently for psychotherapists and for psychiatrists in your own procedures.
If a claim group codes entry does not match what your payer tells you, follow the payer contract and ask for the answer in writing.
A common claim group codes mistake is relying on an old payer bulletin, so check the date on every source.
Another claim group codes mistake is copying a definition into a policy without citing the source.
Send questions about claim group codes to one billing lead so the answer is shared once.
For claim group codes that affect payment, record the claim number and the name of the payer representative.

Share this page

Search this page

GAD-7

General (all payers)

Also called Generalized Anxiety Disorder 7-item scale; anxiety screening questionnaire

Definition: The GAD-7 is a seven-item questionnaire used to screen for and measure the severity of generalized anxiety.
Why it matters: Practices use it for measurement-based care and for billing CPT 96127 per instrument, where the payer allows it.
Illustrative example: A clinician gives the GAD-7 and PHQ-9 at intake and reports two units of 96127.

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

CategoriesBehavioral Health Specific Terms Quality & Risk Adjustment Terms

Gap Exception

General (all payers)

Also called network gap exception; network adequacy exception

Definition: A payer's exception allowing a member to use an out-of-network provider at in-network cost sharing because the network lacks an appropriate provider or timely appointment.
Why it matters: It is a route to in-network benefits for OON therapists and psychiatrists in areas with thin networks.
Illustrative example: A member requests a gap exception because no in-network psychiatrist has an opening.

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

CategoriesContracting & Network Management Eligibility & Benefits

Gatekeeper

General (all payers)

Also called PCP gatekeeper

Definition: A primary care provider who coordinates and approves a member's specialist care under some plans.
Why it matters: Explains referral requirements.
Illustrative example: A member must choose a PCP who refers to specialists.

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

CategoriesEligibility & Benefits

Generative AI

General (all payers)

Also called GenAI; large language model; LLM

Definition: AI that produces new text or other content from prompts, used in areas such as appeal letters and documentation support.
Why it matters: Outputs require review for accuracy and privacy.
Illustrative example: A team drafts an appeal letter with AI and reviews every fact.

Related termsAI Scribe Appeal

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

CategoriesAI & Healthcare Automation Terms

Geographic Practice Cost Index (GPCI)

Medicare

Also called GPCI; Medicare locality adjustment; geographic adjustment

Definition: A geographic practice cost index is a Medicare adjustment that changes payment to reflect differences in the cost of work, practice expense, and malpractice insurance across localities.
Why it matters: It is one reason the same code pays different Medicare amounts in different places. It works with relative value units and the conversion factor.
Illustrative example: Two practices bill the same code, and Medicare pays them different amounts because their localities have different GPCIs.

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

CategoriesMedicare & Medicaid Terms Payment & Reimbursement

Georgia Families

Medicaid (state-specific)

Also called Georgia Medicaid managed care; Georgia CMO

Definition: Georgia's Medicaid managed care program, delivered by care management organizations (CMOs).
Why it matters: Georgia is a served state; the CMO landscape is a known moving target.
Illustrative example: A Georgia provider contracts with each CMO.

Reference sourceMedicaid.govchecked 10/9/26

CategoriesMedicare & Medicaid Terms BCBS, UHC & Commercial Payer Terms

Georgia Pathways

Medicaid (state-specific)

Also called Pathways to Coverage

Definition: A Georgia Medicaid coverage program with work and activity requirements, operating under a state waiver.
Why it matters: The program has a scheduled expiration that is a known moving target.
Illustrative example: A patient's Pathways coverage status is checked before service.

Related termsMedicaid 1115 Waiver

Reference sourceMedicaid.govchecked 10/9/26

CategoriesMedicare & Medicaid Terms Eligibility & Benefits

Ghost Network

General (all payers)

Also called phantom network; inaccurate network

Definition: A network whose directory lists providers who are not actually available, accepting new patients, or in network.
Why it matters: Ghost networks are a known access problem in behavioral health and a regulatory focus.
Illustrative example: A member calls ten listed therapists and none accepts new patients.

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

CategoriesProvider Data Management Terms Contracting & Network Management

Gold Carding

General (all payers)

Also called gold card program; authorization exemption

Definition: A payer program that exempts providers with a strong approval history from certain prior authorization requirements.
Why it matters: Reduces administrative burden where offered.
Illustrative example: A payer waives authorization for qualifying providers.

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

CategoriesPrior Authorization Terminology

Good Faith Estimate (GFE)

General (all payers)

Also called GFE; good faith estimate requirement

Definition: A written estimate of expected charges that providers must give to uninsured or self-pay patients before scheduled services under the No Surprises Act.
Why it matters: Missing or wrong estimates can create compliance exposure.
Illustrative example: A therapist gives a self-pay client an estimate for the first month of sessions.

Related termsNo Surprises Act Self-Pay

Reference sourceCMS (Centers for Medicare & Medicaid Services)CMS No Surprises Actchecked 10/9/26

CategoriesPatient Financial Responsibility Terms Audits & Compliance

Grace Period (Coverage)

General (all payers)

Also called premium grace period; ACA grace period

Definition: A period during which an enrollee who has missed a premium payment may still have coverage, though claims may be pended or later denied if premiums are not paid.
Why it matters: Claims during a grace period can be pended, then denied retroactively.
Illustrative example: A marketplace enrollee is in a grace period; claims pend until payment posts.

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

CategoriesEligibility & Benefits

Greenway Health

General (all payers)

Also called Greenway; Intergy

Definition: A vendor of EHR and practice management software for ambulatory practices. Listed for reference; not an endorsement or partnership.
Why it matters: Used in some multispecialty practices.
Illustrative example: A practice uses Greenway for billing.

Reference sourceGreenway Healthchecked 10/9/26

CategoriesEHR & Healthcare Technology Terms

Gross Collection Rate (GCR)

General (all payers)

Also called GCR; gross collection percentage

Definition: The percentage of total billed charges that a practice collects, before adjusting for contractual write-offs.
Why it matters: Less meaningful than net collection rate because it includes write-offs.
Illustrative example: A practice collects 60% of gross charges.

Reference sourceHFMAchecked 10/9/26

CategoriesRevenue Cycle Metrics

Group Code CO

General (all payers)

Also called CO group code; contractual obligation

Definition: A group code on an ERA meaning the adjustment is a contractual obligation, generally not billable to the patient.
Why it matters: Helps determine if a balance can be billed to the patient.
Illustrative example: A CO adjustment is written off.

Reference sourceX12checked 10/9/26

CategoriesDenials & Appeals Payment & Reimbursement

Group Code OA

General (all payers)

Also called OA group code; other adjustment

Definition: A group code on an ERA for adjustments not classified as CO, PR, or PI.
Why it matters: Requires reading the CARC to decide next steps.
Illustrative example: An OA adjustment appears with a reason code that requires review.

Reference sourceX12checked 10/9/26

CategoriesDenials & Appeals

Group Code PI

General (all payers)

Also called PI group code; payer-initiated reduction

Definition: A group code on an ERA for a payer-initiated reduction not attributed to the provider's contract or the patient.
Why it matters: Signals a payer decision that may be appealable.
Illustrative example: A PI adjustment is reviewed for appeal potential.

Related termsGroup Code CO Group Code OA

Reference sourceX12checked 10/9/26

CategoriesDenials & Appeals

Group Code PR

General (all payers)

Also called PR group code; patient responsibility group

Definition: A group code on an ERA meaning the adjustment is the patient's responsibility, such as copay, deductible, or coinsurance.
Why it matters: Drives patient billing.
Illustrative example: A PR line for $30 is billed to the patient.

Reference sourceX12checked 10/9/26

CategoriesDenials & Appeals Patient Financial Responsibility Terms

Group Enrollment

General (all payers)

Also called group contract enrollment; group participation

Definition: Enrolling a group practice (its Type 2 NPI and tax ID) with a payer, then linking individual clinicians to that group.
Why it matters: Individual clinicians often cannot bill under the group until both the group and the linking are complete.
Illustrative example: A new therapist is added to the group's contract after the payer processes a roster update.

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

CategoriesCredentialing & Enrollment Contracting & Network Management

Group NPI

General (all payers)

Also called billing NPI; organizational billing NPI

Definition: The Type 2 NPI a group uses as its billing provider identifier.
Why it matters: It must match the group's tax ID and payer enrollment or claims will not pay to the right entity.
Illustrative example: A group enrolls with a payer under its group NPI and tax ID.

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

CategoriesProvider Data Management Terms Credentialing & Enrollment

Group Number

General (all payers)

Also called group ID; employer group number

Definition: An identifier for the employer or plan sponsor that provides the coverage.
Why it matters: Helps identify the correct plan and benefit set.
Illustrative example: Two employees have the same payer but different group numbers and different benefits.

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

CategoriesEligibility & Benefits

Group Psychotherapy (90853)

General (all payers)

Also called 90853; group therapy code

Definition: A CPT code for group psychotherapy other than of a multiple-family group.
Why it matters: Coverage, documentation, and unit rules vary by payer.
Illustrative example: A therapist bills 90853 per patient in a group session.

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

CategoriesClaims Processing Behavioral Health Specific Terms

Guarantor

State law (varies by state)

Also called responsible party; financially responsible person; bill payer

Definition: A guarantor is the person who agrees to be financially responsible for a patient's charges, such as a parent for a child or an adult for their own account.
Why it matters: For a minor, the parent is usually the guarantor. Several states say a parent who did not consent to a minor's outpatient mental health care, or who was not informed, is not liable for its cost. Examples are Connecticut, Texas, Florida, and Illinois. Confirm who signs the financial agreement before you bill.
Illustrative example: A 13-year-old in Florida consents to an evaluation on their own, so the practice does not list the parent as guarantor.

Reference sourceNational Center for Youth Law, Minor Consent Compendium 2024: Connecticut National Center for Youth Law, Minor Consent Compendium 2024: Texas National Center for Youth Law, Minor Consent Compendium 2024: Florida National Center for Youth Law, Minor Consent Compendium 2024: Illinoischecked 10/9/26

CategoriesPatient Financial Responsibility Terms Eligibility & Benefits

Quick answer: Claim group codes

What do group codes CO, PR, OA and PI mean?

Group Code CO is a group code on an ERA meaning the adjustment is a contractual obligation, generally not billable to the patient. Helps determine if a balance can be billed to the patient.

Frequently asked questions: Claim group codes

What is gold carding?

Gold Carding is a payer program that exempts providers with a strong approval history from certain prior authorization requirements. Reduces administrative burden where offered.

What is a good faith estimate?

Good Faith Estimate (GFE) is a written estimate of expected charges that providers must give to uninsured or self-pay patients before scheduled services under the No Surprises Act. Missing or wrong estimates can create compliance exposure.

What is a group NPI?

The Type 2 NPI a group uses as its billing provider identifier. It must match the group's tax ID and payer enrollment or claims will not pay to the right entity.

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.

Get a free mental health billing quote

MCM SouthGet a Free Quote