How Much Do Cat Allergy Shots Cost? A Payer-by-Payer Breakdown

This page is entirely about allergy shots (subcutaneous immunotherapy, or SCIT) given to HUMANS who are allergic to cats — not about veterinary products given to cats. If you searched for treatment for your cat's skin allergy, Apoquel, or oclacitinib-class drugs prescribed by a veterinarian, you are in the wrong place. Veterinary products for feline atopic dermatitis are a separate category, billed to pet insurance or paid as pet expenses, and have nothing to do with human allergy CPT codes 95117, 95165, or 95004. This page covers the HUMAN billing breakdown for IgE-mediated cat allergy immunotherapy, including what your insurance plan will pay and what you will owe out of pocket per visit and per year.

With Original Medicare Part B and the 2025 annual deductible of $257 met, a maintenance visit for CPT 95117 (injection only) carries a Medicare-allowed amount of $11.97 (CY 2025 PFS, FR Doc 2024-25382); the patient owes 20% coinsurance, or approximately $2.39. On a day when a 10-dose vial is also prepared (CPT 95165 × 10 doses at $13.91/dose = $139.10), the combined allowed is $151.07 and the patient owes $30.21. Annually, a maintenance year of 14 visits averages approximately $61 in 20% coinsurance (no vial-prep visits counted separately). A Medigap supplemental policy eliminates the 20% coinsurance entirely, making every visit $0 after the deductible. The 2026 Part B deductible rises to $283 (CMS announcement November 14, 2025).

Year 1 includes approximately 39 visits — 26 weekly build-up visits plus 13 early maintenance — per Cox 2011 PP3 (JACI 2011;127[1 Suppl]:S1-S55). At 2025 Medicare-allowed rates: 39 × $11.97 (95117) = $466.83 plus two vial preparations (20 doses × $13.91) = $278.20, totaling approximately $745 Medicare-allowed. The patient owes 20% = $149 after the $257 deductible (Medigap = $0). For commercial PPO post-deductible patients, Year 1 patient cost is approximately $300–$900 in stacked copays ($15–$40 × 39 visits). For HDHP enrollees, Year 1 can run $1,500–$3,000 depending on when the deductible resets. Cash retail at freestanding offices: $2,000–$4,500. At an HOPD: $5,000–$24,000+ for testing alone.

The lowest out-of-pocket cost for cat SCIT is achieved through Kaiser Permanente HMO ($0/visit per Caltech 2024 Kaiser SoCal Plan Chart), Tricare Prime at a military treatment facility ($0/visit per TPM15 Ch. 7 §14.1), or Original Medicare Part B with a Medigap supplemental policy ($0/visit after the annual $257 deductible). For patients without those plans, the cost-minimizing strategies are: (1) confirm the allergist practice is freestanding, not an HOPD — the HOPD facility fee is the single largest cost driver; (2) if on an HDHP, schedule the build-up phase start in January so the deductible is met early in the calendar year; (3) apply HSA or FSA funds, which the IRS designates as qualifying medical expenses under IRC §213(d) per IRS Publication 502.

Partially. California Medi-Cal covers the injection code CPT 95117 but explicitly excludes the antigen preparation codes CPT 95120 through 95134 and CPT 95145 through 95165 as non-benefits under the DHCS Medi-Cal Allergy Manual Part 2 (Allergy Testing and Desensitization). This means a Medi-Cal beneficiary can receive the shot itself, but the antigen (the cat-hair extract vial) must be supplied by another means or absorbed by the practice. In practical terms, many California allergist offices decline to take Medi-Cal SCIT patients specifically because of this exclusion. Patients who are enrolled in Medi-Cal managed care (Covered California Medi-Cal expansion) should verify with the specific health plan and allergist before scheduling.

Year 1 is more expensive for three reasons. First, the build-up phase requires approximately 26 weekly visits versus only 14 per year in maintenance — nearly double the visit frequency. Second, the initial skin-test panel (CPT 95004 per allergen) is performed in Year 1, adding a diagnostic cost of $140–$400+ per 40-allergen panel at allowed rates. Third, for HDHP enrollees, Year 1 is when the annual deductible is first burned through, creating pre-deductible exposure on the earliest visits when frequency is highest. Stachler et al. (AAOA, December 2, 2020) documented this burden: the minimum 3-year OOP projection is $3,120 at $20/visit weekly. Once in maintenance, the 14-visit annual frequency makes each year materially cheaper — typically $140–$560/year in copays for most commercial plans.

FDA standardization affects clinical predictability but not the Medicare allowed amount. Both FDA-standardized cat extracts (cat-hair and cat-pelt at 10,000 BAU/mL, Greer license #308) and non-standardized allergens bill under the same CPT codes (95165, 95117) at the same 2025 Medicare-allowed rates of $13.91/dose and $11.97/visit. The practical cost difference is indirect: because FDA-standardized cat-hair extract has verified lot-to-lot consistency, patients are more likely to progress through the build-up protocol on schedule — fewer unexpected dose adjustments, fewer extra visits, and a more predictable timeline to maintenance. The 2016 Annals of Allergy review of dog SCIT noted 'poor and conflicting results' attributed partly to extract variability; cat SCIT's FDA-standardized extract removes that variable. Same per-dose Medicare rate, structurally lower probability of cost-inflating extra visits.