Pet insurance policies contain specialized terminology that can be confusing to first-time buyers. This glossary defines every key term you will encounter when comparing plans, reading policy documents, or filing claims.

A

Accident
An unexpected physical injury caused by an external event — broken bone, laceration, ingested foreign object, bite wound, hit by car. Covered by all A+I and accident-only plans.
Accident-Only Plan
A pet insurance policy that covers only injuries from accidents, not illnesses. Cheapest policy type ($9–$20/month) but excludes cancer, infections, chronic disease, hereditary conditions, and all illnesses.
Accident and Illness (A+I) Plan
The standard comprehensive pet insurance product. Covers accidents, illnesses, hereditary conditions, cancer, dental illness, and chronic disease. Most pet owners should choose A+I rather than accident-only.
Annual Deductible
The amount you pay out-of-pocket per policy year before insurance reimbursement begins. Once met, all subsequent eligible claims in that policy year are reimbursed at your reimbursement rate. Resets at each annual renewal.
Annual Limit
The maximum total dollar amount your insurer will pay in covered claims during a single policy year. Common options: $5,000, $10,000, $15,000, unlimited. Unlimited means no cap on total reimbursement per year.

B

Benefit Schedule
A reimbursement method where the insurer pays a fixed dollar amount per procedure rather than a percentage of your actual invoice. Example: the schedule pays $150 for an X-ray regardless of what your vet charges. Used by Nationwide's Major Medical plan — generally inferior to actual invoice reimbursement.
Bilateral Condition
A condition that can affect both sides of the body — both hips (bilateral hip dysplasia), both knees (bilateral CCL tear), both eyes. Some insurers (Trupanion is the exception) exclude the second side as pre-existing if the first side was treated before enrollment or during a waiting period. Always check a provider's bilateral exclusion policy for breeds prone to bilateral conditions.

C

Claim
A formal request submitted to your insurer for reimbursement of a covered veterinary expense. You submit the claim after paying your vet, with the invoice and medical records attached.
Coinsurance
The percentage of eligible costs you pay after your deductible. If your reimbursement rate is 80%, your coinsurance is 20%. On a $1,500 eligible claim: you pay $300, insurance pays $1,200.
Congenital Condition
A condition present from birth, regardless of whether it becomes apparent later. Examples: heart defects, cleft palate, portosystemic shunts. Covered by most A+I policies as hereditary/congenital if not pre-existing at enrollment.
Curable Pre-Existing Condition
A condition that was pre-existing at enrollment but has since been treated and resolved. Some insurers (Embrace, Nationwide, ASPCA) will re-evaluate curable pre-existing conditions after 6–24 months symptom-free and remove the exclusion. Incurable conditions (allergies, diabetes, most hereditary conditions once manifested) cannot be removed from the exclusion list.

D

Deductible
See Annual Deductible or Per-Condition Deductible.
Direct Vet Payment
A payment model where the insurer pays the veterinarian directly, eliminating the need for the owner to pay upfront and wait for reimbursement. Trupanion is the only major U.S. pet insurer that offers direct vet payment at participating hospitals.

E

Effective Date
The date your insurance coverage begins. Any conditions with symptoms before the effective date are pre-existing and excluded. The effective date is typically the day after you enroll; waiting periods then apply from this date.
Exclusion
A condition, treatment, or situation not covered by your policy. Common exclusions: pre-existing conditions, routine wellness, breeding costs, cosmetic procedures, prescription food. Exclusions are listed in your policy document.

H

Hereditary Condition
A condition with a genetic component, commonly predisposed in specific breeds. Examples: hip dysplasia (Labs, German Shepherds), IVDD (Dachshunds, Corgis), HCM (Maine Coons, Sphynx), BOAS (French Bulldogs). Covered by all major A+I plans as long as not pre-existing at enrollment.

I

Illness
Any medical condition not caused by an external accident. Includes infections, cancer, diabetes, allergies, hereditary diseases, chronic conditions, and organ failure. Covered by A+I plans; not covered by accident-only plans.
IVDD (Intervertebral Disc Disease)
A spinal condition common in chondrodystrophic breeds (Dachshunds, Corgis, Basset Hounds, French Bulldogs). Covered by all A+I policies as hereditary — surgery costs $3,500–$7,000.

P

Per-Condition Deductible
A deductible applied per condition per lifetime rather than annually. Used by Trupanion: you pay the deductible once per condition for the life of the policy. Subsequent treatments for the same condition incur no additional deductible. Advantageous for pets managing multiple chronic conditions long-term.
Pre-Existing Condition
Any illness, injury, or symptom that existed before your policy's effective date. Excluded permanently by most insurers (some allow curable conditions to be reconsidered after a symptom-free period). The most important reason to enroll pets young and healthy.
Premium
The monthly (or annual) amount you pay to maintain your pet insurance policy, regardless of whether you file any claims.

R

Reimbursement Model
The standard pet insurance payment system: you pay the vet, then submit a claim to receive reimbursement from your insurer. Contrast with direct vet payment (Trupanion).
Reimbursement Rate
The percentage of eligible vet costs (after deductible) that your insurer pays. Common rates: 70%, 80%, 90%, 100% (Figo, Pumpkin). Higher rates mean higher monthly premiums.

W

Waiting Period
The time between your policy's effective date and when coverage for a specific condition type begins. Claims during the waiting period are denied. Typical waiting periods: 2–5 days for accidents, 14 days for illnesses, 14 days to 12 months for orthopedic conditions.
Wellness Add-On
An optional policy addition that covers routine preventive care — vaccines, annual exams, dental cleaning, flea/tick prevention, heartworm testing. Not included in base A+I plans; purchased separately and priced as an additional monthly cost.