The frequency ranking of pet insurance claims has been stable enough across the published industry data that it now functions as a buying-decision input rather than trivia. Across the reviewed insurer claim reports and NAPHIA's industry data, the same five categories occupy the top five almost every year: gastrointestinal disorders, skin conditions, ear infections, dental disease, and orthopedic injuries [NAPHIA: State of the Industry, Top Conditions, 2024]. The order shifts between species and between carriers' policyholder mixes, but the cast does not.
Two things make the ranking useful at the buying stage. First, the top five are all conditions a buyer can underwrite on the policy terms (waiting period, pre-existing rule, dental-illness clause) rather than the headline premium. Second, the bottom of the ranking (the rare, high-cost cancer or neurological claims) is where the upper end of an annual payout cap actually matters, which flips the conventional advice on "cap size."
The ranking from cited claims data
The published NAPHIA and insurer claim summaries put the top categories in roughly this order on US dog policies, with year-to-year shuffling between adjacent positions [NAPHIA: State of the Industry, Top Conditions, 2024]:
-
Gastrointestinal disorders. Vomiting, diarrhea, and foreign-body cases are the most frequently filed claim category on dog policies year after year. The cost per case runs from low-three-figure consultations to the $1,873-to-$7,976 range CareCredit prices on intestinal foreign-body surgery [CareCredit: How Much Does Foreign Body Surgery for Dogs Cost?, 2025].
-
Skin and ear conditions. Allergic skin disease, otitis, hot spots, and chronic dermatology cases. These are the highest-frequency, lowest-per-case claims on most insurer books, and the category where the curable-vs-incurable pre-existing distinction matters most.
-
Dental disease. Periodontal disease and gingivitis sit near the top because the prevalence in adult dogs and cats is high. Whether the claim pays depends entirely on the carrier's dental-illness clause; Embrace covers it to $1,000 a year on the base policy, Pets Best covers it without a mandatory prior dental exam, Trupanion excludes it [Embrace: Dental illness coverage, 2026-05].
-
Orthopedic injuries. Cruciate ligament tears, luxating patella, hip dysplasia. Lower frequency than GI or skin but materially higher cost per case: cruciate repair runs $2,793 to $6,417 per knee on cited 2025 cost data [CareCredit: How Much Does CCL (ACL) Surgery for Dogs Cost?, 2025]. The category drives a disproportionate share of total payout.
-
Cancer. The highest per-case cost category. Chemotherapy runs $3,000 to $10,000 for a full protocol on cited cost data; radiation $4,500 to $6,000 for a curative course and up to $10,000 or more for some cases on the same source [CareCredit: How Much Does Chemotherapy for Dogs Cost?, 2025]. Lower frequency on the under-7 dog population, much higher frequency past 7.
The cat ranking shuffles the dental and skin positions up and pushes orthopedics down, because the cat surgical-claim base rate is lower. Urinary tract conditions land in a senior-cat-prominent slot the dog ranking does not have.
Why the top claims are what they are
The ranking is not arbitrary. Each of the top five categories shares a structural feature: it is high-prevalence in the general pet population, and it tends to recur once it has started. That recurrence is what makes the curable-vs-incurable pre-existing distinction the most expensive sentence in most policy contracts.
A first ear infection, GI episode, UTI, or skin flare-up can be classed as curable at the named reviewed carriers and re-qualify for coverage after 12 consecutive months symptom-free at Embrace [Embrace: What is a curable pre-existing condition, 2026]. The same conditions, if they recur within that window, become incurable in the policy's eyes and stay excluded for the life of the policy. The top five claim categories are exactly the ones where this distinction bites most often. The full mechanic is on pre-existing conditions.
The orthopedic and cancer categories, ranked four and five by frequency, account for a disproportionate share of total claim payout because the per-case cost is so much higher than the top three. A buyer reading the ranking as "GI and skin are what insurance is for" is missing the math: the policy's economic value comes mostly from the rare four-and-five claims, not the frequent one-and-two ones.
The cited NAPHIA industry data, plus the consumer-buying-guide context, both flag that the most-frequent claim categories are not the same as the highest-payout categories [NAPHIA: State of the Industry, Top Conditions, 2024]. Consumer Reports surveyed 3,583 policyholders and found that only 44% received full reimbursement at their chosen policy level after the copay, which on a frequency-weighted book skews toward the small-claim categories where deductibles and copay-rate erosion eat the most relative value [Brian Vines, Consumer Reports Pet Insurance Buying Guide, 2026].
What the ranking implies for a buyer
Three structural implications fall out of the top-five ranking once a buyer reads it as a buying input.
First, on a frequency basis, dental cover is one of the most-used clauses in the contract. A buyer for whom dental is a likely claim category should treat the dental-illness clause as a load-bearing buying term, not a marginal one. Embrace and Pets Best clear that bar; Trupanion does not.
Second, on a per-case-cost basis, orthopedic and cancer are where the policy's annual payout cap actually matters. A buyer choosing a tunable annual limit at the lower tunable tiers (Lemonade's lower tiers, for example) is trading the right-tail upside for cost savings, exactly the trade a buyer of a cancer-prone or orthopedic-prone breed should think twice about. Trupanion's no-cap structure pays a premium specifically to keep the right tail open.
Third, the top three categories (GI, skin, ear) are recurrence-prone, which means the curable-condition window is the single most valuable concession a carrier makes to a buyer of a typical dog. Embrace's named 12-month symptom-free reclassification is the cleanest version of this in the reviewed set [Embrace: What is a curable pre-existing condition, 2026].
The full "is pet insurance worth it" math, run against this ranking, is at is pet insurance worth it. The five terms that decide three-year cost across this ranking are at how to choose pet insurance. The review method is at /methodology/.