We earn net service revenue through our home health and hospice care centers by providing a variety of services almost exclusively in the homes of our patients. This net service revenue is earned and billed either on an episode of care basis, on a per visit basis or on a daily basis depending upon the payment terms and conditions established with each payor for services provided. We refer to home health revenue earned and billed on a 60-day episode of care as episodic-based revenue.

When we record our service revenue, we record it net of estimated revenue adjustments and contractual adjustments to reflect amounts we estimate to be realizable for services provided, as discussed below. We believe, based on information currently available to us and based on our judgment, that changes to one or more factors that impact the accounting estimates (such as our estimates related to revenue adjustments, contractual adjustments and episodes in progress) we make in determining net service revenue, which changes are likely to occur from period to period, will not materially impact our reported consolidated financial condition, results of operations, cash flows or our future financial results.

Net service revenue is recorded under the Medicare prospective payment system (“PPS”) based on a 60-day episode payment rate that is subject to adjustment based on certain variables including, but not limited to: (a) an outlier payment if our patient's care was unusually costly (capped at 10% of total reimbursement per provider number); (b) a low utilization payment adjustment (“LUPA”) if the number of visits was fewer than five; (c) a partial payment if our patient transferred to another provider or we received a patient from another provider before completing the episode; (d) a payment adjustment based upon the level of therapy services required (with various incremental adjustments made for additional visits, with larger payment increases associated with the sixth, fourteenth and twentieth visit thresholds); (e) adjustments to payments if we are unable to produce documentation for the face-to-face encounter requirement; (f) adjustments to payments if we are unable to perform periodic therapy assessments; (g) the number of episodes of care provided to a patient, regardless of whether the same home health provider provided care for the entire series of episodes; (h) changes in the base episode payments established by the Medicare Program; (i) adjustments to the base episode payments for case mix and geographic wages; and (j) recoveries of overpayments.

We make adjustments to Medicare revenue on completed episodes to reflect differences between estimated and actual payment amounts, an inability to obtain appropriate billing documentation or authorizations acceptable to the payor and other reasons unrelated to credit risk. We estimate the impact of such adjustments based on our historical experience, which primarily includes a historical collection rate of over 99% on Medicare claims, and record this estimate during the period in which services are rendered as an estimated revenue adjustment and a corresponding reduction to patient accounts receivable. In addition, management evaluates the potential for revenue adjustments and, when appropriate, provides allowances based upon the best available information. Therefore, we believe that our reported net service revenue and patient accounts receivable will be the net amounts to be realized from Medicare for services rendered.

In addition to revenue recognized on completed episodes, we also recognize a portion of revenue associated with episodes in progress. Episodes in progress are 60-day episodes of care that begin during the reporting period, but were not completed as of the end of the period. We estimate this revenue on a monthly basis based upon historical trends. The primary factors underlying this estimate are the number of episodes in progress at the end of the reporting period, expected Medicare revenue per episode and our estimate of the average percentage complete based on visits performed. As of June 30, 2013 and 2012, the difference between the cash received from Medicare for a request for anticipated payment (“RAP”) on episodes in progress and the associated estimated revenue was immaterial and, therefore, the resulting credits were recorded as a reduction to our outstanding patient accounts receivable in our condensed consolidated balance sheets for such periods.

Episodic-based Revenue. We recognize revenue in a similar manner as we recognize Medicare revenue for episodic-based rates that are paid by other insurance carriers, including Medicare Advantage programs; however, these rates can vary based upon the negotiated terms.

Non-episodic based Revenue. Gross revenue is recorded on an accrual basis based upon the date of service at amounts equal to our established or estimated per-visit rates, as applicable. Contractual adjustments are recorded for the difference between our standard rates and the contracted rates to be realized from patients, third parties and others for services provided and are deducted from gross revenue to determine net service revenue and are also recorded as a reduction to our outstanding patient accounts receivable. In addition, we receive a minimal amount of our net service revenue from patients who are either self-insured or are obligated for an insurance co-payment.

Gross revenue is recorded on an accrual basis based upon the date of service at amounts equal to the estimated payment rates. The estimated payment rates are daily or hourly rates for each of the four levels of care we deliver. The four levels of care are routine care, general inpatient care, continuous home care and respite care. Routine care accounts for 99% of our total net Medicare hospice service revenue for the three and six-month periods ended June 30, 2013, as compared to 97% and 98% for the three and six-month periods ended June 30, 2012, respectively. We make adjustments to Medicare revenue for an inability to obtain appropriate billing documentation, acceptable authorizations or face to face documentation and other reasons unrelated to credit risk. We estimate the impact of these adjustments based on our historical experience, which primarily includes our historical collection rate on Medicare claims, and record it during the period services are rendered as an estimated revenue adjustment and as a reduction to our outstanding patient accounts receivable.

Additionally, as Medicare hospice revenue is subject to an inpatient cap limit and an overall payment cap for each provider number, we monitor these caps and estimate amounts due back to Medicare if a cap has been exceeded. We record these adjustments as a reduction to revenue and an increase in other accrued liabilities. We have settled our Medicare hospice reimbursements for all fiscal years through October 31, 2011. For the Federal cap years ended October 31, 2012 and October 31, 2013, we have $4.0 million and $4.8 million recorded for estimated amounts due back to Medicare in other accrued liabilities as of June 30, 2013 and December 31, 2012, respectively. As a result of our adjustments, we believe our revenue and patients accounts receivable are recorded at amounts that will be ultimately realized.

We record gross revenue on an accrual basis based upon the date of service at amounts equal to our established rates or estimated per day rates, as applicable. Contractual adjustments are recorded for the difference between our established rates and the amounts estimated to be realizable from patients, third parties and others for services provided and are deducted from gross revenue to determine our net service revenue and patient accounts receivable.

Our patient accounts receivable are uncollateralized and consist of amounts due from Medicare, Medicaid, other third-party payors and patients. There is no single payor, other than Medicare, that accounts for more than 10% of our total outstanding patient receivables, and thus we believe there are no other significant concentrations of receivables that would subject us to any significant credit risk in the collection of our patient accounts receivable. We fully reserve for accounts which are aged at 365 days or greater. We write off accounts on a monthly basis once we have exhausted our collection efforts and deem an account to be uncollectible.

We believe the credit risk associated with our Medicare accounts, which represent 71% and 68% of our net patient accounts receivable at June 30, 2013 and December 31, 2012, respectively, is limited due to our historical collection rate of over 99% from Medicare and the fact that Medicare is a U.S. government payor. Accordingly, we do not record an allowance for doubtful accounts for our Medicare patient accounts receivable, which are recorded at their net realizable value after recording estimated revenue adjustments as discussed above. During the three and six-month periods ended June 30, 2013, we recorded $2.8 million and $6.6 million, respectively, in estimated revenue adjustments to Medicare as compared to $2.1 million and $4.7 million during the three and six-month periods ended June 30, 2012, respectively.

We believe there is a certain level of credit risk associated with non-Medicare payors. To provide for our non-Medicare patient accounts receivable that could become uncollectible in the future, we establish an allowance for doubtful accounts to reduce the carrying amount to its estimated net realizable value.

For our home health patients, our pre-billing process includes verifying that we are eligible for payment from Medicare for the services that we provide to our patients. Our Medicare billing begins with a process to ensure that our billings are accurate through the utilization of an electronic Medicare claim review. We submit a RAP for 60% of our estimated payment for the initial episode at the start of care or 50% of the estimated payment for any subsequent episodes of care contiguous with the first episode for a particular patient. The full amount of the episode is billed after the episode has been completed (“final billed”). The RAP received for that particular episode is then deducted from our final payment. If a final bill is not submitted within the greater of 120 days from the start of the episode, or 60 days from the date the RAP was paid, any RAPs received for that episode will be recouped by Medicare from any other claims in process for that particular provider number. The RAP and final claim must then be re-submitted.

For our hospice patients, our pre-billing process includes verifying that we are eligible for payment from Medicare for the services that we provide to our patients. Our Medicare billing begins with a process to ensure that our billings are accurate through the utilization of an electronic Medicare claim review. Once each patient has been confirmed for eligibility, we will bill Medicare on a monthly basis for the services provided to the patient.

For our non-Medicare patients, our pre-billing process primarily begins with verifying a patient's eligibility for services with the applicable payor. Once the patient has been confirmed for eligibility, we will provide services to the patient and bill the applicable payor. Our review and evaluation of non-Medicare accounts receivable includes a detailed review of outstanding balances and special consideration to concentrations of receivables from particular payors or groups of payors with similar characteristics that would subject us to any significant credit risk. We estimate an allowance for doubtful accounts based upon our assessment of historical and expected net collections, business and economic conditions, trends in payment and an evaluation of collectibility based upon the date that the service was provided. Based upon our best judgment, we believe the allowance for doubtful accounts adequately provides for accounts that will not be collected due to credit risk

Fair Value of Financial Instruments

The following details our financial instruments where the carrying value and the fair value differ (amounts in millions):

		Fair Value at Reporting Date Using
Financial Instrument		As of June 30, 2013		Quoted Prices in Active Markets for Identical Items (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Long-term obligations	$	74.8	$	0	$	75.1	$	0

The estimates of the fair value of our long-term debt are based upon a discounted present value analysis of future cash flows. Due to the existing uncertainty in the capital and credit markets the actual rates that would be obtained to borrow under similar conditions could materially differ from the estimates we have used.

The fair value hierarchy is based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value. The three levels of inputs are as follows:

For our other financial instruments, including our cash and cash equivalents, patient accounts receivable, accounts payable and accrued expenses, we estimate the carrying amounts' approximate fair value. Our deferred compensation plan assets are recorded at fair value.

Net income per share attributable to Amedisys, Inc. common stockholders, calculated on the treasury stock method, is based on the weighted average number of shares outstanding during the period. The following table sets forth, for the periods indicated, shares used in our computation of the weighted-average shares outstanding, which are used to calculate our basic and diluted net income attributable to Amedisys, Inc. common stockholders (amounts in thousands):

		For the Three-Month Periods Ended June 30,		For the Six-Month Periods Ended June 30,
		2013	2012	2013	2012
Weighted average number of shares outstanding - basic		31,160	29,780	30,900	29,584
Effect of dilutive securities:
	Stock options	12	23	17	16
	Non-vested stock and stock units	317	223	381	303
Weighted average number of shares outstanding - diluted		31,489	30,026	31,298	29,903
Anti-dilutive securities		217	531	217	595