Table 1. Cost Estimation Accuracy Rate Among Patients Who Used the Sutter Cost Estimator Tool With Matching EOB Statements .

Category	No. (%)
	Survey Respondent (n = 125)	Survey Nonrespondent (n = 217)	Total (N = 342)
Accurate or patient less than estimatea	103 (82.4)	184 (84.8)	287 (83.9)
Estimate matched with billed amount: difference between estimate and billed amount was ≤$10 or ≤5%	70 (56.0)	118 (54.4)	188 (55.0)
Patients had different or additional services at the time of visit owing to medical necessity; no payment by patient necessary	7 (5.6)	18 (8.3)	25 (7.3)
Estimated copay higher than copay in the EOB; no payment by patient necessary	0	2 (0.9)	2 (0.6)
Estimated deductible less than deductible in the EOB owing to timing issues; patient may have met their deductible after their estimate was created	22 (17.6)	33 (15.2)	55 (16.1)
Estimated coinsurance less than coinsurance in the EOB owing to timing issues; patient may have met their deductible after their estimate was created	4 (3.2)	13 (6.0)	17 (5.0)
Not accurate: patient paid more than estimate	22 (17.6)	33 (15.2)	55 (16.1)
Patients had different or additional services at the time of visit owing to medical necessity; payment by patient necessary	11 (8.8)	18 (8.3)	29 (8.5)
Estimated copay less than copay in the EOB; payment by patient necessary	2 (1.6)	2 (0.9)	4 (1.2)
Payer denied the claim owing to services not being covered or coding issues	1 (0.8)	0	1 (0.3)
Insurance changed from the time the estimate was created to when the service was provided	0	1 (0.5)	1 (0.3)
Estimated deductible less than deductible in the EOB; payment by patient necessary	4 (3.2)	9 (4.1)	13 (3.8)
Estimated coinsurance less than coinsurance in the EOB; payment by patient necessary	2 (1.6)	2 (0.9)	4 (1.2)
Contracted payers provided different contracted rates on the EOB compared with the estimate	2 (1.6)	1 (0.5)	3 (0.9)

Abbreviation: EOB, explanation of benefit.

^aAccuracy was defined as a difference between the estimate and billed amount of less than $10 or 5%.