Medical Terminology: Common Terms, Word Parts, and Documentation Examples

Medical terminology is the language clinicians use to describe the body, symptoms, findings, conditions, tests, and care plans. You do not need a complete medical dictionary to read a note or referral. The highest-value terms are the ones that tell the next person what happened, where, when, how serious it appears, and what should happen next.

This guide focuses on the medical terminology used in clinical notes, intake, referrals, and handoffs. It includes a practical medical terminology list, the word parts that make unfamiliar terms easier to understand, and examples of clear documentation.

Use this as a learning guide, not as clinical advice or a substitute for local policy. A term can have a specialty- or organization-specific meaning. Verify any term that could affect treatment, coding, a medication, or a handoff.

On this page:

What is medical terminology?
Word parts
Anatomy and direction
Documentation terms
Documentation examples
Abbreviations
Patient-centered language
Look up a term
FAQs

What is medical terminology?

Medical terminology is a shared, precise vocabulary. It can turn several vague words into one specific term: bilateral lower-extremity edema says swelling is present in both legs; acute dyspnea says shortness of breath is new or sudden.

The point is not jargon. Good terminology makes documentation accurate, concise, and useful to the next clinician, staff member, patient, or caregiver who reads the record.

Medical terminology word parts: prefixes, roots, and suffixes

Many medical terms can be decoded from reusable components. Start with the suffix, then work backward.

Word part	Role	Example
Prefix	At the beginning; modifies location, timing, amount, or speed.	brady-cardia = slow heart rate
Root	Central meaning, often a body part or system.	cardi/o = heart
Suffix	At the end; often names a condition, process, procedure, or specialty.	cardi-itis = inflammation of the heart
Combining vowel	Usually “o”; links parts for pronunciation.	neur/o/logy

For example, nephrectomy breaks down to nephr- (kidney) + -ectomy (surgical removal): surgical removal of a kidney. This works for many Greek- and Latin-based terms, but not all. Eponyms, acronyms, and local shorthand should be checked in a trusted reference.

Common medical prefixes

Prefix	Meaning	Example
a- / an-	without	afebrile = without fever
brady- / tachy-	slow / fast	bradycardia; tachypnea
dys-	difficult, painful, or abnormal	dysuria
hyper- / hypo-	above / below normal	hypertension; hypoglycemia
intra- / inter-	within / between	intravenous; intercostal
peri-	around	periorbital
pre- / post-	before / after	preoperative; postoperative

Common medical roots and suffixes

Word part	Meaning	Example
cardi/o	heart	cardiology
derm/at/o	skin	dermatitis
gastr/o	stomach	gastroenterology
hemat/o, hem/o	blood	hematology; hematuria
neur/o	nerve or nervous system	neurology
nephr/o	kidney	nephrology
oste/o	bone	osteoporosis
pulmon/o, pneum/o	lung	pulmonary; pneumonia
arthr/o	joint	arthritis
-algia	pain	neuralgia
-ectomy	surgical removal	appendectomy
-emia	blood condition	hypoglycemia
-itis	inflammation	otitis
-megaly	enlargement	cardiomegaly
-opathy	disease or disorder	neuropathy
-pnea	breathing	apnea; dyspnea
-scopy	visual examination with a scope	colonoscopy

Anatomy terminology and directional terms in medical notes

Directional terms let every member of a care team describe the same location consistently. Laterality—right, left, or bilateral—is especially important in referrals, imaging, procedures, and handoffs.

Term	Meaning	Example
anterior / posterior	toward the front / back	posterior neck tenderness
superior / inferior	above / below	inferior to the umbilicus
medial / lateral	toward the midline / toward the side	lateral ankle swelling
proximal / distal	closer to / farther from the trunk or point of origin	distal pulses intact
superficial / deep	near the surface / farther inside	deep tissue injury
ipsilateral / contralateral	same side / opposite side	ipsilateral arm weakness
unilateral / bilateral	one side / both sides	bilateral lower-extremity edema

Medical terminology list for documentation, referrals, and handoffs

The terms below are high-frequency in clinical records. They describe the structure of a note, the status of a problem, and the current plan—not just a diagnosis.

Term	Meaning in a clinical record
Chief concern (CC)	The main reason for the visit, ideally in the patient’s own words. “Chief complaint” is also common.
History of present illness (HPI)	The current problem’s onset, location, quality, timing, severity, associated symptoms, and context.
Review of systems (ROS)	Symptoms discussed across body systems; it is different from the physical exam.
Past medical history (PMH)	Relevant prior diagnoses, surgeries, medications, allergies, and history.
Subjective / objective	Information reported by the patient or caregiver / measured or observed findings.
Assessment	The clinician’s synthesis or clinical impression; it can include uncertainty.
Differential diagnosis	Possible explanations under consideration—not confirmed diagnoses.
Plan	Tests, treatment, monitoring, consultation, follow-up, and education.
Referral / consult	A request for another clinician or service to evaluate or advise on a defined issue. Local workflows may use the terms differently.
Disposition	Where the patient goes next: home, observation, admission, transfer, or another care setting.

Common charting terms and clinical descriptors

Term	Meaning
acute / chronic	new, sudden, or short in duration / ongoing or long-standing
exacerbation	worsening or flare of an existing condition
resolved	no longer present or active at the time documented
afebrile	without fever at the time assessed
ambulatory	able to walk; document the device or assistance needed when relevant
intact	present or preserved, such as skin, sensation, or pulses
unremarkable	no notable abnormal finding in the stated context; say what was examined when possible
stable	not meaningfully changing in the stated measure or condition; name the measure when possible
tolerated	completed or received an intervention without an observed problem; state the intervention and response
pending	ordered or expected but not yet available or completed

Medical terminology examples in clinical documentation

Clear notes connect patient-reported information, observed facts, the clinician’s assessment, and the next action. These examples are illustrative only; document the actual encounter and follow local requirements.

Symptom history

Documentation-style sentence: “Patient reports acute, intermittent right lower-quadrant abdominal pain beginning this morning, associated with nausea; does not report vomiting or fever.”

This identifies onset, pattern, location, associated symptoms, and relevant negatives without implying a diagnosis.

Objective finding

Documentation-style sentence: “Temperature 37.1°C; patient afebrile. Ambulates 50 feet with a front-wheeled walker and one-person assist; gait unsteady.”

This supports “afebrile” with a measurement and makes the patient’s mobility status observable and actionable.

Assessment and plan

Documentation-style sentence: “Assessment: dyspnea with differential including respiratory infection and fluid overload. Plan: obtain ordered testing, monitor oxygen saturation, and reassess after results are available.”

The differential states possibilities under evaluation; it does not present them as established diagnoses.

Referral or handoff

Documentation-style sentence: “Referred to cardiology for evaluation of recurrent palpitations. Receiving clinician informed of symptom frequency, ECG result, current medications, and return precautions.”

For a verbal or written handoff, a structured format such as SBAR—Situation, Background, Assessment, Recommendation—can help ensure essential information is transferred.

Medical terms vs. medical abbreviations

A medical term is the full word or phrase: shortness of breath, hypertension, magnetic resonance imaging. An abbreviation is a shortened form: SOB, HTN, MRI.

Abbreviations are not automatically safe just because they are familiar in one department. Follow your organization’s approved list, spell out unfamiliar terms for a mixed audience, and never invent shorthand. This is especially important in medication-related documentation.

The Joint Commission’s “Do Not Use” guidance includes U or u for unit, IU, QD, QOD, a trailing zero such as 1.0 mg, a missing leading zero such as .5 mg, and ambiguous abbreviations for morphine or magnesium sulfate. Write the intended word or number clearly instead. Read our guide to medical abbreviations for more.

Use patient-centered medical terminology

Notes increasingly have more than one audience. Clinical terminology should state what was observed, what the patient said, and what was done—without adding assumptions about credibility, motivation, or character.

Instead of	Use more specific, neutral language
“noncompliant”	“has not taken the medication for two weeks; reports cost as the barrier”
“poor historian”	“history limited by acute pain” or “details provided by caregiver”
“patient refused”	“patient declined after discussion of [intervention]; stated [reason, if offered]”
“stable”	“blood pressure and heart rate unchanged from prior assessment”
“normal labs”	name the relevant result and value, or the results within the reference range

Traditional terms such as “denies,” “endorses,” and “complains” are common, but can be interpreted differently by patients who read their notes. The AMA’s open-notes toolkit recommends minimizing jargon, acronyms, and language that may be misinterpreted. “Reports,” “does not report,” “states,” and direct quotations can be equally precise and more neutral.

How to look up medical terminology safely

Do not infer a term’s meaning from word parts alone when it could change care. Use this short check:

Read the context. Is it a symptom, diagnosis, medication, test, procedure, or plan?
Check the source. A specialist note, imaging report, medication order, and referral can use the same term differently.
Use an authoritative reference. MedlinePlus is a good starting point for plain-language definitions; use your EHR’s approved dictionary or a recognized clinical reference for work-related decisions.
Check local policy. Confirm approved abbreviations and specialty conventions.
Clarify, do not guess. Ask the responsible clinician if ambiguity could affect treatment, routing, coding, or safety.

A diagnosis term in a note is not automatically an ICD-10 code, and a procedure name is not automatically a CPT code. See coding explained for that distinction, or continue with medical documentation and nursing documentation for practical note-writing guidance.

Medical terminology FAQs

What are the most common medical terminology word parts?

High-value starting points include hyper-, hypo-, brady-, tachy-, and peri-; cardi/o, neur/o, gastr/o, and derm/at/o; and -itis, -ectomy, -algia, -emia, and -pnea. Learn them through real examples rather than as isolated lists.

What is the difference between an assessment and a diagnosis?

A diagnosis names a condition. An assessment is the clinician’s synthesis of the available information and may include a confirmed diagnosis, a suspected condition, a differential diagnosis, or a statement of uncertainty. It supports the plan of care.

Does “negative” mean bad in a medical note?

Usually, no. In documentation, “negative” often means a symptom, test, or finding was not present—for example, “negative for chest pain” or “negative test result.” Read the surrounding phrase.

Can I use medical abbreviations in documentation?

Use only abbreviations approved by your organization and appropriate for the setting and audience. Avoid unsafe or ambiguous forms, particularly in medication documentation. When uncertain, spell it out.