This list was compiled using our general knowledge of workers’ compensation and the Maryland Worker’s Compensation Commission website at:  We often get asked question like “What does MMI mean?” or “What is AWW in workers’ comp” or how does “Nature and Extent relate to my injuries?”  This list is designed to help answer those questions.  For more information on anything workers’ comp related, please feel free to contact us.

This list of abbreviations can also be used in conjunction with our workers’ compensation terms glossary.

AI: Accidental Injury (single traumatic event)

ADL: Activities of Daily Living

AFCS: Agreement of Final Compromise and Settlement

AMA: American Medical Association

AOE: Arising Out of Employment

AWW: Average Weekly Wage

C-06: Form to be filed when cutting off benefits

C-40: Form used to contest all of part of claim

C-1, C-2, C-3, etc.: Cervical Spine

CPRS: Complex Regional Pain Syndrome

CPT: Common Procedure Terminology

CLT: Claimant

CNA: Certified Nursing Assistant

CNS: Central Nervous System

COE: Course of Employment

COLA: Cost of Living Adjustment

Cont.: Continued

CR: Compensation rate

C/R: Causal Relationship

CTS: Carpal Tunnel Syndrome

Cx: Complaints

DC: Doctor of Chiropractic Medicine

DO: Doctor of Osteopathic Medicine

DDS: Doctor of Dental Science

DOE: Department of Employment

DOI: Date of Injury / DOA means date of accident

DORS: Division of Rehabilitative Services

DOS: Date of Service

D/L: Date of Loss

Dx: Diagnosis

ECF: Employee Claim Form

EE: Employee

EFR: Employer’s First Report

EOB: Explanation of Benefits

ER: Employer or Emergency Room

FCE: Functional Capacity Evaluation

FX: Fracture

HCP: Health Care Provider

HRG: Hearing

Hx: History

ICU: Intensive Care Unit

ILU: Industrial Loss of Use

IME: Independent Medical Examination

ISS: Issues

IWIF: Injured Workers’ Insurance Fund, now Chesapeake Employers Insurance Co.

L-1, L-2, L-3, etc.: Lumbar Spine 

Legal: Motion hearing on legal issue

LD: Light Duty

LMS: Labor Market Survey

LOE: Loss of Earnings

LT: Lost Time

MD: Medical Doctor

MI: Myocardial Infarction

MMI: Maximum Medical Improvement

MRI: Magnetic Resonance Imagine

MO: Medical Claim Only

MVA: Motor Vehicle Accident

NCLT: No Compensable Lost Time

NCM: Nurse Case Management

N/E: Nature and Extent of PPD

NLT: No Lost Time

OC/AC: Occupation Accident Insurance

OCC: Occurrence

OD: Occupational Disease

OT: Occupational Therapy

OJT: On the Job Training

OTC: Over-the- Counter Medication

OWC: Office of Workers’ Compensation 

PA: Physician’s Assistant

PI: Private Investigator

PT: Physical Therapy

Px: Prognosis

PPD: Permanent Partial Disability Benefits 

PRN: Patient Return as Needed

PTD: Permanent Total Disability Benefits

PRAC: Practitioner/Member of a Provider Who Provides Vocational Rehabilitation Services

PVDR: Provider/Company That Facilitates Vocational Rehabilitation Services

Rating: Permanent impairment evaluation

ROM: Range of Motion

ROR: Reset on Request (no hearing to be scheduled until requested by a party)

RPT: Registered Physical Therapist

RSD: Reflex Sympathetic Dystrophy (regional pain syndrome)

RTW: Return to Work

Rx: Prescription

SAWW: State Average Weekly Wage

SIF: Subsequent Injury Fund

SIG: Self-insurance Group

SSDI: Social Security Disability Income

SSI: Social Security Income

SSN: Social Security number

STD: Short Term Disability

Subro: Subrogation (third party claim)

Sx: Symptoms

T-2, T-2, T-3, etc.: Thoracic Spine

TENS: Transcutaneous Electrical Nerve Stimulation

TMJ: Temporomandibular Joint Syndrome

TPA: Third Party Administrator

TPD: Temporary Partial Disability

TT: Temporary Total Disability

Tx: Treatment

UEF: Uninsured Employers Fund

VR: Vocational Rehabilitation

VRP: Vocational Rehabilitation/Retraining Plain

WCC: Workers’ Compensation Commission

W/S: Wage Statement

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