A searchable, categorized reference of 124+ medical abbreviations used in clinical records — explained in plain language for paralegals, legal assistants, and litigation attorneys who review medical charts, hospital records, and physician notes.
Abbreviations for the core physiological measurements documented at every clinical visit.
| Abbreviation | Full Term | Legal Context & Notes |
|---|---|---|
| BP | Blood Pressure | Documented as systolic/diastolic (e.g. 120/80). Critical for establishing patient condition at time of injury. |
| HR / P | Heart Rate / Pulse | Beats per minute. Elevated HR can indicate acute distress or pain at time of examination. |
| RR | Respiratory Rate | Breaths per minute. Important in pulmonary injury, drowning, and asphyxia cases. |
| T / Temp | Temperature | Typically in Fahrenheit (°F) in US records. Elevated temp may indicate post-operative infection. |
| SpO₂ / O₂ Sat | Oxygen Saturation | Percentage of hemoglobin carrying oxygen. Below 95% is typically flagged; critical in respiratory and TBI cases. |
| GCS | Glasgow Coma Scale | 3–15 scale measuring consciousness (Eyes, Verbal, Motor). Central metric in traumatic brain injury (TBI) documentation. |
| BMI | Body Mass Index | Weight-to-height ratio. Appears in routine physicals; may be raised in causation arguments re: pre-existing conditions. |
| MAP | Mean Arterial Pressure | Average arterial pressure across one cardiac cycle. Appears in ICU and critical care records. |
| I&O | Intake and Output | Fluid intake vs. urine output. Tracked in inpatient records; relevant to renal injury cases. |
| Wt / Ht | Weight / Height | Recorded at most clinical visits. Used for BMI calculation and medication dosing. |
| ROM | Range of Motion | Degree of movement at a joint (measured in degrees). Key metric in orthopedic and soft-tissue injury documentation. |
| AVPU | Alert, Voice, Pain, Unresponsive | Rapid consciousness scale used by EMS/emergency responders; precursor to GCS. |
Common shorthand for the medical conditions, complaints, and findings that appear throughout clinical records.
| Abbreviation | Full Term | Legal Context & Notes |
|---|---|---|
| Dx | Diagnosis | The identified medical condition. Appears in assessment sections of SOAP notes and discharge summaries. |
| Hx | History | Patient's prior medical history. 'PMH' (past medical history) and 'FH' (family history) are common variants. |
| CC | Chief Complaint | The patient's primary stated reason for the visit. Opens the Subjective section of a SOAP note. |
| HPI | History of Present Illness | Narrative of how and when the current complaint began. Crucial for timeline reconstruction. |
| PMH | Past Medical History | Documented prior conditions. Frequently cited in defense arguments about pre-existing conditions. |
| r/o | Rule Out | The clinician is testing to exclude a diagnosis. A 'ruled out' condition was considered but not confirmed. |
| c/o | Complains Of | The patient reports this symptom. Subjective — not yet examined or confirmed. |
| TBI | Traumatic Brain Injury | Any brain injury caused by external force. Classified mild/moderate/severe by GCS and imaging findings. |
| LOC | Loss of Consciousness | Documented duration is critical in TBI classification; even brief LOC elevates injury severity. |
| MVA | Motor Vehicle Accident | The precipitating event. Check records for DOI (date of injury) correlation with accident date. |
| HNP | Herniated Nucleus Pulposus | Disc herniation — nucleus gel pushes through outer fibrous ring. Common PI finding in spine injury. |
| DDD | Degenerative Disc Disease | Age-related disc wear. Defendants frequently cite DDD as a pre-existing condition. |
| HTN | Hypertension | High blood pressure. Common pre-existing condition; can affect vascular injury cases. |
| DM | Diabetes Mellitus | Type 1 (autoimmune) or Type 2 (metabolic). Affects wound healing; relevant in surgical complication cases. |
| fx | Fracture | A break in a bone. Classified as open/closed, displaced/non-displaced, comminuted, etc. |
| lac | Laceration | A cut or tear in skin or tissue. Depth and repair method should be documented. |
| CVA | Cerebrovascular Accident (Stroke) | Interruption of blood flow to the brain. Distinguish from TIA (transient ischemic attack). |
| PTSD | Post-Traumatic Stress Disorder | Psychiatric diagnosis following traumatic events. Increasingly documented in PI and mass tort cases. |
| CRPS | Complex Regional Pain Syndrome | Chronic pain condition, formerly RSD (Reflex Sympathetic Dystrophy). Common in protracted PI cases. |
| SOB / DOE | Shortness of Breath / Dyspnea on Exertion | Respiratory complaint. 'DOE' indicates SOB only with physical activity. |
| N/V | Nausea and Vomiting | Frequently documented post-accident and post-operatively; relevant to concussion/TBI workup. |
Abbreviations for the diagnostic tests, surgical procedures, and therapies referenced across medical records.
| Abbreviation | Full Term | Legal Context & Notes |
|---|---|---|
| MRI | Magnetic Resonance Imaging | Best soft-tissue imaging. Standard for disc herniations, ligament tears, and brain injuries. No radiation. |
| CT / CAT | Computed Tomography | Cross-sectional X-ray imaging. Preferred for acute trauma (brain bleeds, fractures) due to speed. |
| XR / CXR | X-ray / Chest X-ray | Standard bone imaging. CXR is chest-specific. Poor soft-tissue detail vs. MRI. |
| EMG / NCS | Electromyography / Nerve Conduction Study | Tests nerve and muscle function. Used to document radiculopathy and nerve damage. |
| EEG | Electroencephalogram | Measures brain electrical activity. Used in seizure evaluation following TBI. |
| EKG / ECG | Electrocardiogram | Records heart electrical activity. Ordered with chest pain; relevant in cardiac injury cases. |
| US / U/S | Ultrasound | Real-time soft tissue and vascular imaging. Used for DVT diagnosis and abdominal injury. |
| ESI | Epidural Steroid Injection | Steroid injected into epidural space to reduce nerve inflammation. Common PI pain management step. |
| PT | Physical Therapy | Rehabilitation for musculoskeletal injuries. Treatment plan length and frequency are important chronology data points. |
| OT | Occupational Therapy | Focuses on restoring functional daily activities. Relevant to disability and wage-loss calculations. |
| TENS | Transcutaneous Electrical Nerve Stimulation | Electrical stimulation for pain management. Appears in PT and pain clinic records. |
| ORIF | Open Reduction Internal Fixation | Surgical repair of a fracture with hardware (plates, screws, rods). Significant procedure for damages calculation. |
| Sx / surg | Surgery | Shorthand for any surgical procedure. Review the operative report for CPT codes and intraoperative findings. |
| debridement | Debridement | Removal of necrotic/contaminated tissue. Common in wound care and infection treatment records. |
| FCE | Functional Capacity Evaluation | Standardized assessment of physical work ability. Used to set restrictions and quantify disability. |
| IME | Independent Medical Examination | Examination by a physician not treating the patient — typically retained by the defense or insurer. |
| MMI | Maximum Medical Improvement | The point at which the physician certifies the patient has recovered as much as expected. Triggers settlement timing. |
Facility types, care settings, and administrative shorthand that determine where and when care was delivered.
| Abbreviation | Full Term | Legal Context & Notes |
|---|---|---|
| ER / ED | Emergency Room / Emergency Department | First point of care for acute injuries. ER records document initial presentation and are key timeline anchors. |
| ICU | Intensive Care Unit | Critical care setting. ICU admission indicates severe injury; length of stay is a major damages factor. |
| CCU | Cardiac Care Unit | Specialized ICU for cardiac patients. |
| OR | Operating Room | Where surgical procedures are performed. Operative reports include start/stop times, findings, and complications. |
| PACU | Post-Anesthesia Care Unit | Recovery room immediately following surgery. Documents any immediate post-operative complications. |
| DC / d/c | Discharge / Discontinued | Context-dependent: 'd/c home' = discharge; 'd/c Tylenol' = discontinue medication. Check context carefully. |
| A&E | Accident and Emergency | British equivalent of ER/ED. May appear in records from Canadian or international facilities. |
| SOAP | Subjective, Objective, Assessment, Plan | Standard outpatient note format. Subjective = patient report; Objective = exam findings; Assessment = diagnosis; Plan = treatment. |
| H&P | History and Physical | The initial comprehensive exam note. Produced on hospital admission and for surgical clearance. |
| Dc Summary / Disch Sum | Discharge Summary | Comprehensive document prepared when a patient leaves inpatient care. Contains admission Dx, treatment course, and follow-up instructions. |
| PRN | Pro Re Nata (As Needed) | Medication ordered to be taken only when required, not on a fixed schedule. |
| STAT | Immediately (Statim) | Indicates urgent action required at once. |
| NPO | Nil Per Os (Nothing by Mouth) | Patient must not eat or drink. Pre-operative requirement; also used in severe GI illness. |
| Bates | Bates Number / Bates Stamp | Sequential page identifier applied to records in litigation. Used for citation in medical chronologies. |
Who documented the record matters as much as what it says — specialty determines clinical authority.
| Abbreviation | Full Term | Legal Context & Notes |
|---|---|---|
| MD | Medical Doctor (Allopathic) | Licensed physician. Opinion carries significant weight in causation and IME contexts. |
| DO | Doctor of Osteopathic Medicine | Equivalent licensure to MD in most US states. Often noted separately in records. |
| NP | Nurse Practitioner | Advanced practice RN with prescribing authority. Common in primary care settings. |
| PA / PA-C | Physician Assistant / Certified | Licensed mid-level provider who works under physician supervision. |
| RN | Registered Nurse | Documents nursing assessments, medication administration, and vitals in inpatient records. |
| LPN / LVN | Licensed Practical / Vocational Nurse | Performs clinical care under RN supervision. Notes may appear in long-term care records. |
| PT / DPT | Physical Therapist / Doctor of Physical Therapy | Provides and documents physical rehabilitation. Progress notes track functional improvement. |
| OT / OTR | Occupational Therapist / Registered | Documents functional capacity and ADL (Activities of Daily Living) limitations. |
| DC | Doctor of Chiropractic | Chiropractor. Common in soft-tissue PI cases; records include SOAP notes and spinal assessments. |
| Ortho | Orthopedic Surgeon / Orthopedics | Bone, joint, and musculoskeletal specialist. Often the treating and/or IME physician in fracture cases. |
| Neuro | Neurologist / Neurosurgeon / Neurology | Brain and nervous system specialist. Involved in TBI, stroke, and radiculopathy cases. |
| Psych | Psychiatrist / Psychologist / Psychiatry | Mental health providers. Psychiatrists (MD/DO) prescribe; psychologists (PhD/PsyD) provide therapy. |
| PM&R | Physical Medicine and Rehabilitation | Physiatry — coordinates long-term rehabilitation following severe injury. Issues disability and MMI determinations. |
| PCP | Primary Care Provider / Physician | The patient's regular doctor — often the source of pre-incident health records. |
How medications are ordered, how often, and by what route — critical for tracing pain management and treatment compliance.
| Abbreviation | Full Term | Legal Context & Notes |
|---|---|---|
| po / PO | By Mouth (Per Os) | Oral administration. Most common medication route. |
| IV | Intravenous | Administered directly into a vein. Used in emergency, inpatient, and infusion settings. |
| IM | Intramuscular | Injected into muscle. Common for certain vaccines and emergency medications. |
| SQ / SubQ / SC | Subcutaneous | Injected under the skin. Common for insulin and anticoagulants (e.g. Lovenox). |
| qd / QD | Once Daily (Quaque Die) | One dose per day. Often written as 'daily' in modern records to reduce transcription errors. |
| BID | Twice Daily (Bis In Die) | Two doses per day, typically morning and evening. |
| TID | Three Times Daily (Ter In Die) | Three doses per day, usually spaced ~8 hours apart. |
| QID | Four Times Daily (Quater In Die) | Four doses per day. Common for around-the-clock pain management. |
| PRN | As Needed (Pro Re Nata) | Take only when symptom occurs. Indicates the condition is intermittent or patient-managed. |
| HS | At Bedtime (Hora Somni) | Medication taken at sleep time. Common for sleep aids and certain muscle relaxants. |
| NSAIDs | Non-Steroidal Anti-Inflammatory Drugs | Ibuprofen, naproxen, etc. First-line for musculoskeletal pain. Risks with long-term use. |
| APAP | Acetaminophen (Tylenol) | Pain reliever / fever reducer. Liver toxicity risk at high doses; documented in overdose cases. |
| opioids | Opioid Analgesics | Morphine (MS, MSO4), oxycodone, hydrocodone, fentanyl. Prescription tracking is important in PI and WC cases. |
| mg / mcg / mL | Milligram / Microgram / Milliliter | Standard dose units. mcg = 1/1000 mg. Transcription errors in dose units can indicate documentation quality issues. |
| DC / d/c | Discontinued | In medication context: the drug was stopped. Distinguish from patient discharge (same abbreviation). |
Location and system shorthand that pinpoints where in the body an injury, finding, or condition exists.
| Abbreviation | Full Term | Legal Context & Notes |
|---|---|---|
| L / R / bilat | Left / Right / Bilateral | Side of body. 'Bilat' means both sides. Always confirm laterality — mixing L and R is a common documentation error. |
| C1–C7 | Cervical Vertebrae 1–7 | Neck region. C-spine injuries common in MVA. C3–C5 innervate the diaphragm; high cervical injuries can be fatal. |
| T1–T12 | Thoracic Vertebrae 1–12 | Mid-back. T-spine fractures often result from high-energy trauma (falls, MVA). |
| L1–L5 | Lumbar Vertebrae 1–5 | Lower back. Most common site of disc herniation and degenerative disease in PI cases. |
| S1 | First Sacral Vertebra | Top of the sacrum. L5–S1 is the most commonly herniated disc level. |
| c-spine / cx | Cervical Spine | Neck vertebrae. Standard XR or MRI ordered after MVA with neck pain or neurological symptoms. |
| l-spine / lx | Lumbar Spine | Lower back. 'Lumbar radiculopathy' = nerve pain radiating from lumbar disc into leg. |
| CNS | Central Nervous System | Brain and spinal cord. CNS injuries have long-term disability implications. |
| PNS | Peripheral Nervous System | Nerves outside brain and spinal cord. Peripheral neuropathy documented with EMG/NCS. |
| MSK | Musculoskeletal | Muscles, bones, joints, tendons, and ligaments. The system most commonly injured in PI cases. |
| GI | Gastrointestinal | Digestive system. Relevant in abdominal trauma, medication side effects, and toxic exposure cases. |
| CV | Cardiovascular | Heart and blood vessels. Relevant in cardiac injury, DVT (deep vein thrombosis) post-injury. |
| HEENT | Head, Eyes, Ears, Nose, and Throat | Standard physical exam section. Documents facial trauma, vision, and hearing in the examination. |
| UE / LE | Upper Extremity / Lower Extremity | Arms and legs. Bilateral LE weakness is a red flag for spinal cord involvement. |
| L/R hip / knee / shoulder / elbow / wrist / ankle | Joint locations | Always recorded with laterality (L or R). Joint injuries documented by anatomy for CPT billing. |
The codes, standards, and legal-medical concepts that connect clinical records to litigation strategy.
| Abbreviation | Full Term | Legal Context & Notes |
|---|---|---|
| ICD-10 | International Classification of Diseases, 10th Revision | The diagnosis coding system used for billing and records in the US since 2015. Every Dx on a bill has an ICD-10 code (e.g. M54.5 = low back pain). |
| CPT | Current Procedural Terminology | Procedure codes used for billing (e.g. CPT 99284 = high-complexity ER visit). Appears on every Explanation of Benefits (EOB). |
| EOB | Explanation of Benefits | Insurance document showing what was billed, what the insurer paid, and what remains owed. Critical for damages calculation. |
| HIPAA | Health Insurance Portability and Accountability Act | Federal law governing privacy and security of protected health information (PHI). Governs how records are requested and stored. |
| PHI | Protected Health Information | Any identifiable health information covered by HIPAA. All medical records in litigation are PHI. |
| BAA | Business Associate Agreement | Required HIPAA contract when sharing PHI with a vendor. Any software used to process records must have a signed BAA. |
| DOI | Date of Injury | The date the incident or accident occurred. Anchors the before/after comparison in the medical chronology. |
| DOA | Date of Accident | Same as DOI; used interchangeably in many records and legal documents. |
| MMI | Maximum Medical Improvement | Clinical certification that the patient has reached maximum expected recovery. Triggers permanent impairment rating. |
| IME | Independent Medical Examination | Exam by a physician retained by the insurer or defense. IME reports often conflict with treating physician opinions. |
| FCE | Functional Capacity Evaluation | Standardized occupational assessment of physical work capacity. Used to set permanent work restrictions. |
| WC | Workers' Compensation | No-fault insurance system covering workplace injuries. Separate from PI litigation; different legal standards. |
| PI | Personal Injury | Legal claim for physical or psychological harm caused by another's negligence. |
| UM / UIM | Uninsured / Underinsured Motorist | Insurance coverage when the at-fault driver lacks adequate insurance. Common in MVA cases. |
| PIP | Personal Injury Protection | No-fault auto insurance coverage for medical bills regardless of who caused the accident. |
| pre-existing | Pre-Existing Condition | A condition documented before the date of injury. Defense commonly argues pre-existing conditions mitigate damages. |
Medical records are written by clinicians for clinicians — full of abbreviations, shorthand, and specialty-specific codes. For a paralegal reviewing hundreds of pages of records, decoding this shorthand is one of the first and most time-consuming tasks.
This glossary covers the abbreviations most commonly encountered in personal injury, workers' compensation, and medical malpractice records. When an abbreviation has context-dependent meanings (like "DC" meaning both discharge and discontinue), the context column explains both.
For deeper guidance, see our guide on how to read medical records for litigation.
ICD-10 diagnosis codes and CPT procedure codes appear on every bill and in many clinical notes. They're the most standardized data points in a medical record — and the most directly linked to damages.
A well-built medical chronology captures the ICD-10 and CPT codes alongside the clinical narrative, linking each charge back to the visit record. This lets attorneys calculate total billed charges, identify the cost of each procedure, and trace the treatment arc from DOI to MMI.
AI-assisted tools like Chronos extract and structure these codes automatically. See how purpose-built AI compares to manual review.
Chronos reads every page of your records, extracts every abbreviation, and builds a cited, editable chronology — so your team spends time on strategy, not medical dictionaries.
A practical walkthrough of record types, SOAP notes, imaging reports, and what to look for.
From page-by-page manual review to AI-assisted extraction — the full process explained.
Chronos vs Superinsight vs InPractice vs Tavrn — and how AI compares to manual review.