National US Estimates of Recombinant Tissue Plasminogen Activator Use ICD-9 Codes Substantially Underestimate
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1 National US Estimates of Recombinant Tissue Plasminogen Activator Use ICD-9 Codes Substantially Underestimate Dawn Kleindorfer, MD; Christopher J. Lindsell, PhD; Lawrence Brass, MD; Walter Koroshetz, MD; Joseph P. Broderick, MD Background and Purpose Current US estimates of recombinant tissue plasminogen activator (rt-pa) use have been based either on extrapolation of regional studies or on administrative database estimates, both of which may have inherent biases. We sought to compare the utilization of rt-pa in acute ischemic stroke in the MEDPAR database to another national hospital database with drug utilization information. Methods Cases were defined as DRG 14,15, and 524 and ICD-9 code 99.1, which indicates cerebral thrombolysis, for fiscal year 2001 to Additionally, the Premier database was queried for rt-pa utilization documented in pharmacy records in those patients admitted for stroke. Change over time and difference between databases were tested using Poisson regression. Results When comparing databases, rt-pa use, as identified by ICD-9 code 99.1, was only documented in 0.95% of stroke cases in 2004 in MEDPAR, and 1.2% in the Premier database, which slightly increased by 0.04% to 0.09% over time. Analysis of pharmacy billing records increased the estimate to 1.82%. Exclusion of cases younger than 65years excluded 43% of cases treated with rt-pa. In 2004, 12.7% of cases receiving thrombolytic had either a TIA or a hemorrhagic stroke ICD-9 code. Conclusions We estimate the rate of rt-pa use in the United States to be 1.8% to 2.1% of ischemic stroke patients. The rate of thrombolytic use for ischemic stroke was slightly increasing between 2001 and 2004 at a rate of 0.04% to 0.09% per year. A significant proportion of patients treated with rt-pa are likely miscoded as either TIA or hemorrhagic stroke. We conservatively estimate that to patients received rt-pa in (Stroke. 2008;39: ) Key Words: acute stroke treatment epidemiology tpa The only FDA-approved drug treatment for acute ischemic stroke is recombinant tissue plasminogen activator (rt-pa). 1 Multiple studies have confirmed the benefits of rt-pa when appropriate patients are selected, 2 7 yet very few ischemic stroke patients receive rt-pa. Although single centers might report rates as high as 20%, 4,8 national and population-based estimates of rt-pa use range from 1% to 4% of all ischemic stroke patients Determining a true national rate of rt-pa use is quite challenging for several reasons. High rates reported at single centers are likely attributable in part to referral bias of patients who have treatment initiated at outlying hospitals or who are referred for treatment. Administrative database estimates, including those that use the Medicare Provider and Analysis Review (MEDPAR) dataset, depend on billing codes that are likely insensitive and often exclude patients younger than 65 years old. Finally, population-based estimates, which may provide the most accurate rates, represent only a single region and are likely performed in centers with active stroke teams promoting acute treatment. Rates from population-based studies may or may not extrapolate to the nation overall. Therefore, we sought to describe the use of rt-pa in the United States, as well as the temporal trends in the use of rt-pa, without relying on ICD-9 codes or regional estimates of use. We evaluated this within a private nationwide hospital database, the Premier Hospital database, which allows crossreferencing to pharmacy coding. Rates of rt-pa use estimated using the Premier Hospital database were then compared with rates generated from the MEDPAR database. Methods This was a secondary analysis of existing data. Data were extracted from 2 datasets: the MEDPAR dataset and the Premier Hospital database, both described below. MEDPAR is a claims-based dataset that contains every fee-forservice Medicare-eligible hospital discharge in the United States. Nearly all US residents with age greater than or equal to 65 years old Received April 24, 2007; final revision received July 11, 2007; accepted July 26, From the University of Cincinnati College of Medicine (D.K., C.J.L., J.P.B.), Ohio; Yale University (L.B.), New Haven, Conn; and the National Institute of Neurological Disorders and Stroke (W.K.), Bethesda, Md. Correspondence to Dawn Kleindorfer, MD, University of Cincinnati, Department of Neurology, 231 Albert Sabin Way ML 0525, Cincinnati, Ohio dawn.kleindorfer@uc.edu 2008 American Heart Association, Inc. Stroke is available at DOI: /STROKEAHA
2 Kleindorfer et al ICD-9 Codes Substantially Underestimate 925 Table 1. Estimation of Thrombolytic Use for Acute Ischemic Stroke (ICD-9 433, 434, 436), Premier and MEDPAR National Databases FY 2001 FY 2002 FY 2003 FY 2004 MedPAR Total number of ischemic stroke cases DRGs /15/524 Number with ICD-9 code (%) 2362 (0.81%) 2344 (0.82%) 2344 (0.86%) 2502 (0.95%) Premier DATABASE (sample) Total number of ischemic stroke cases, DRGs /15/524, age 65yo Number with ICD-9 code (%) 354 (0.88%) 403 (0.93%) 386 (0.92%) 421 (1.05%) Number with pharmacy billing for thrombolytic (%)* 510 (1.30%) 563 (1.30%) 553 (1.31%) 579 (1.45%) Total number of cases, DRG 14/15/524, all ages Number with ICD-9 code 99.1 (%) 572 (1.04%) 632 (1.06%) 616 (1.05%) 646 (1.20%) Number with pharmacy billing for thrombolytic (%)* 875 (1.60%) 1002 (1.67%) 956 (1.63%) 1021 (1.82%) *Including Alteplase 100 mg, Alteplase 50 mg, Alteplase 20 mg, Alteplase misc, retavase, tenectaplase, urokinase, excluding streptokinase and Alteplase 1 mg. are eligible for Medicare, as are all patients with end-stage renal disease or solid organ transplant, and all patients that have been totally disabled for more than 24 months. Medicare beneficiaries in managed care plans (roughly 15% of Medicare enrollment in 2005) are not captured in the MedPAR data. Hospitalizations are categorized by the Diagnosis Related Group (DRG), which describes the primary reason for admission as determined by the billing personnel. The DRG is based on the primary and secondary International Classification of Diseases, version 9 (ICD-9) codes, which identifies diagnoses and procedures for patients, both old and new. Reimbursement to hospitals is based primarily on the DRG weights. The Premier Hospital dataset is a privately-owned dataset that contains data from 506 hospitals across the United States. Premier is currently partnered with the FDA to study drug utilization in hospitalized patients. Therefore, all billing and administrative coding information can be cross-linked to hospital pharmacy billing records. The Premier database represents approximately 1 in 6 hospital discharges in the United States each year, and preliminary comparisons between participating Premier hospitals and patient characteristics and those of the probability sample of hospitals and patients selected for the National Hospital Discharge Survey (NHDS) proved to be very similar with regard to patient age, gender, length of stay, mortality, primary discharge diagnosis, and primary procedure groups. 12 All hospitalizations are entered into the database for all payors, not just Medicare. Cases potentially eligible for rt-pa treatment based on diagnosis were defined as those patient visits with a hospital discharge code of 433, 434, or 436, within DRG 14 and 15 (DRG 14: intracranial hemorrhage or stroke with infarct and DRG 15: nonspecific CVA and precerebral occlusion without infarct), and DRG 524 (transient cerebral ischemia). DRG 524 was created in 2003 and aims to identify TIA as distinct from DRGs 14 and 15. Those patient visits with hemorrhagic stroke or TIA ICD-9 codes (430, 431, 432, and 435) were excluded. Cases receiving thrombolysis were identified by having an ICD-9 code of 99.1, which denotes thrombolytic use. In addition, pharmacy billing codes within the Premier database were searched for all thrombolytics, which included alteplase, reteplase, urokinase, and tenecteplase. Finally, to estimate thrombolytic therapy specific to stroke treatment, the query was limited to alteplase, 50 mg and 100 mg vials, to rule out use for declotting central lines, for example. For fiscal years (FY) 2001 to 2004, the total number of cases, and the proportion of cases treated with rt-pa, was estimated for each database. For the Premier database, estimates were based on the entire sample, and separately for those aged 65 years so that rates could be compared directly between Premier and MEDPAR. A sensitivity analysis was conducted to explore how the estimated rate of thrombolytic usage would be impacted by including patients coded with a diagnosis of TIA or hemorrhagic stroke, ie, those cases with DRG 14, 15, and 524 that received thrombolysis and had either a TIA (435) or a hemorrhagic stroke (430, 431, and 432) ICD-9 code. Diagnoses that might have warranted thrombolytic therapy were evaluated in patients with these diagnoses, including acute myocardial infarction, acute pulmonary embolus, acute thrombosis in extremity, and dialysis catheter declotting (ICD x1, 996.7x, , ). Differences in proportions were tested using the Chi-square statistic. To test for trends, the Chi-square was partitioned into that attributable to regression over time and that attributable to other sources of heterogeneity. 13 Results The total number of DRG 14, 15, and 524 admissions contained within each database are presented in Table 1 (excluding hemorrhagic stroke and TIA ICD-9 codes), as well as the estimated rates of thrombolytic use based on the ICD-9 code For each year, the rate of thrombolytic use tended to be lower when estimated using the MEDPAR database than when using the comparable subset of the Premier database (patients aged greater than or equal to 65), but this was only significant in 2002 (P 0.029). Within the Premier database, consideration of pharmacy billing codes also increased the rate of thrombolytic use, to a maximum of 1.82% in Exclusion of patients younger than 65 missed 43% of thrombolytic treatments in FY Within MEDPAR, the rate of thrombolytic use increased by 0.04% per year (P 0.001). Within the Premier database, when considering only ICD-9 and DRG codes and patients aged 65 years, the rate increased by 0.08% per year (P 0.003). When considering pharmacy billing codes in those aged 65 years, the rate increased by 0.09% per year (P 0.006). A similar rate was observed when including all patients (P 0.002). Patterns of thrombolytic therapy drug utilization within the Premier database are presented in Table 2. All thrombolytic use (including such drugs as tenectoplase and urokinase) was substantially higher than the use of Alteplase, 50 mg or 100 mg vials. However, even using the most conservative estimate with only Alteplase 50 mg or 100 mg, the estimated rate
3 926 Stroke March 2008 Table 2. Thrombolytic Drug Utilization Stratified by ICD-9 Classification, and DRG: Ischemic vs Nonischemic Coded Cases, Premier Database, FY 2004 DRG 14 Intracranial hemorrhage or stroke with infarct Thrombolytic of use in 2004 was still substantially higher than that based on the ICD-9 code 99.1: 901 treatments of alteplase 50 mg or100 mg versus 646 treatments based on ICD-9 codes (28% missed). Within MEDPAR, we found 681 patients during the 4-year period that were coded as either TIA or hemorrhagic stroke and also coded as receiving thrombolytic therapy (681/ claims total). Of these 681, 34% were given TIA codes, 56% were given intracerebral hemorrhage codes, and 10% were given either subarachnoid hemorrhage or other hemorrhagic stroke codes. The sensitivity analysis found that inclusion of these patients as ischemic stroke patients receiving rt-pa increased our estimated rate of thrombolytic therapy to 2.1%. None of these patients were given ICD-9 codes for other conditions that might have warranted thrombolysis (such as pulmonary embolus, acute MI, etc). Within Premier, during 2004 alone we found 130 of cases coded as either TIA or hemorrhagic stroke that received Ischemic Stroke Cases ICD-9 433, 434, 436 TIA or Hemorrhagic Stroke Cases ICD-9 430, 431, 432, 435 Total discharges Billed for thrombolytic ALTEPLASE MISC 1 2 ALTEPLASE, ACTIVASE VL 100MG ALTEPLASE, ACTIVASE VL 20MG 26 4 ALTEPLASE, ACTIVASE VL 50MG RETEPLASE MISC 2 1 RETEPLASE, RETAVASE 1 VIAL 10.8IU(18.8MG) RETEPLASE, RETAVASE 2 VIAL 10.8IU(18.8MG) 2 0 TENECTEPLASE, TNKASE VL 50MG 11 2 UROKINASE, ABBOKINASE VL 250,000U 31 4 UROKINASE, ABBOKINASE VL 5,000U Nonspecific CVA or Total discharges precerebral occlusion w/o infarct Billed for thrombolytic ALTEPLASE, MISC ALTEPLASE, ACTIVASE VL 100MG ALTEPLASE, ACTIVASE VL 20MG 1 ALTEPLASE, ACTIVASE VL 50MG 29 2 RETEPLASE, RETAVASE 1 VIAL 10.8IU(18.8MG) 1 RETEPLASE, RETAVASE 2 VIAL 10.8IU(18.8MG) 5 TENECTEPLASE, TNKASE VL 50MG 1 UROKINASE, ABBOKINASE VL 250,000U 4 1 UROKINASE, ABBOKINASE VL 5,000U Transient cerebral ischemia Total discharges Billed for thrombolytic 2 41 ALTEPLASE, ACTIVASE VL 100MG 2 31 ALTEPLASE, ACTIVASE VL 20MG 2 ALTEPLASE, ACTIVASE VL 50MG 8 RETEPLASE, RETAVASE 1 VIAL 10.8IU(18.8MG) TENECTEPLASE, TNKASE VL 50MG 1 UROKINASE, ABBOKINASE VL 250,000U 1 some form of thrombolytic, which accounts for 12.7% of total thrombolytic treatments (Table 2). Four of these patients had a complications of dialysis catheter diagnosis code that might have referred to thrombolytic therapy to recanalize occluded dialysis shunts, but none had codes for other acute disease processes that might require thrombolysis. Discussion We found that the rate of thrombolytic use for ischemic stroke in the United States slightly increased between 2001 and 2004, which was statistically significant, no matter how the treatment rates were assessed; however, the increases in treatment rates of 0.04 to 0.09% per year were disappointingly small. We also discovered that by analyzing pharmacy billing records, we were able to detect 25% to 30% more patients treated with thrombolytic than by using administrative ICD-9 codes to estimate rates of use. Finally, exclusion of younger patients from administrative databases risks miss-
4 Kleindorfer et al ICD-9 Codes Substantially Underestimate 927 Figure. Change in DRG structure for ischemic stroke treatment with thrombolytic agent. ing a substantial portion of rt-pa treated ischemic stroke patients, in our study the proportion was up to 43%. We also unexpectedly found that 12.7% of patients that received thrombolytic therapy for ischemic stroke were likely miscoded as hemorrhagic stroke or TIA. Although we cannot be certain that the thrombolytic was not given for another reason, such as an intracranial bleed after receiving thrombolytics for myocardial infarction, the lack of any other diagnostic coding for these other acute vascular thromboses suggests that the lytic was given primarily for ischemic stroke symptoms. Patients coded with hemorrhagic stroke codes may represent hemorrhagic transformation after receiving lytics, as we suspect the distinction between hemorrhagic transformation and primary intracerebral hemorrhage were not well understood by administrative billing staff. Future estimations of hemorrhagic transformation rates using administrative data would be extremely difficult without detailed record review. For TIA, we note that by excluding those patients labeled as TIA by billing administrators, we are likely excluding those patients with the best clinical response to the medication. However, including all TIAs in the denominator for rt-pa utilization, when resolving symptoms is a contraindication to rt-pa use, does not seem reasonable. Retrospective analyses of TIA need to examine DRGs 14, 15, and 524, because TIA was included in DRG 14 and 15 until Our best US national estimate of rt-pa use for ischemic stroke is 1.8 to 2.1% in The upper limit includes those patients that we believe were miscoded ischemic stroke patients in the numerator, whereas the lower limit excludes them. If these estimates are extrapolated to current national estimates of stroke incidence of about ischemic strokes in the United States each year, we conservatively estimate that to patients received rt-pa in Limitations of our analysis include the use of administrative databases for rt-pa use estimates. Both the Premier and MEDPAR databases are based on DRG coding, which is determined by billing personnel, and not medical personnel chart review. We note that there is no other way to obtain national level estimates of use, and regional estimates are often subject to referral biases. Another limitation is that we are not able to distinguish the mode of delivery for the rt-pa. The ICD-9 code 99.1 likely is mostly intravenous rt-pa, but may include intraarterial as well. There is a slight difference in the payor mix between the MEDPAR and Premier databases, as approximately 15% of Medicare beneficiaries with managed care plans were excluded from MEDPAR, whereas all payors were included in Premier. However, the impact of patient insurance status on rates of tpa use is unknown, further studies should evaluate socioeconomic factors in rt-pa use for ischemic stroke. The recent approval of the new DRG 559 in October of 2005 for acute stroke patients treated with rt-pa in October of 2005 by CMS increased the payment to hospitals for acute stroke patients by an average of $6700 to more than $ (Figure). A recent study has confirmed that the new DRG significantly improves the cost-to-reimbursement ratio at a hospital in Scottsdale, Arizona, for patients treated with rt-pa. 14 The institution of the new DRG, the establishment of formal primary stroke centers, and the various state-wide initiatives to standardize acute stroke care may lead to increased rt-pa use over time. Artifactual increases may also occur as billing personnel become more aware of the rt-pa treatment codes now linked to increased hospital reimbursement. However, we are hopeful that the increased reimbursement will cover the hospital costs for these sicker, resource needy patients. We also hope that it will stimulate the growth of organized stroke systems of care, and eventually improve patient outcome.
5 928 Stroke March 2008 Acknowledgments We thank Christopher Hogan, PhD for his assistance with MEDPAR data analysis and Tonja Curtis and Greg White for their help in obtaining the Premier data for this analysis. Sources of Funding Fees for obtaining the Premier database data, and the MEDPAR analysis, were funded by Johnson and Johnson Inc. None. Disclosures References 1. NINDS rt-pa Stroke Study Group. Tissue plasminogen activator for acute ischemic stroke. N Engl J Med. 1995;333: NINDS rt-pa Stroke Trial Investigators and Coordinators. A systems approach to immediate evaluation and management of hyperacute stroke: Experience at 8 centers and implications for community practice and patient care. Stroke. 1997;28: Reeves MJ, Arora S, Broderick JP, Frankel M, Heinrich JP, Hickenbottom S, Karp H, LaBresh KA, Malarcher A, Mensah G, Moomaw CJ, Schwamm L, Weiss P. Acute stroke care in the us: Results from 4 pilot prototypes of the paul coverdell national acute stroke registry. Stroke. 2005;36: Grotta JC, Burgin WS, El-Mitwalli A, Long M, Campbell M, Morgenstern LB, Malkoff M, Alexandrov AV. Intravenous tissue-type plasminogen activator therapy for ischemic stroke: Houston experience 1996 to Arch Neurol. 2001;58: Gilligan AK, Thrift AG, Sturm JW, Dewey HM, Macdonell RA, Donnan GA. Stroke units, tissue plasminogen activator, aspirin and neuroprotection: Which stroke intervention could provide the greatest community benefit? Cerebrovasc Dis. 2005;20: NINDS t-pa Stroke Study Group. Generalized efficacy of t-pa for acute stroke: Subgroup analysis of the ninds t-pa stroke trial. Stroke. 1997;28: Stettler BA KJ, Alwell K, Kleindorfer D, Miller R, Moomaw C, Broderick JP, Kissela BM. Rt pa treatment of acute ischemic stroke is associated with lower mortality and better functional outcome in a biracial population. Stroke abstract. 2006;37: Engelstein E, Margulies J, Jeret JS. Lack of t-pa use for acute ischemic stroke in a community hospital: High incidence of exclusion criteria. Am J Emerg Med. 2000;18: Katzan IL, Hammer MD, Hixson ED, Furlan AJ, Abou-Chebl A, Nadzam DM. Utilization of intravenous tissue plasminogen activator for acute ischemic stroke. Arch Neurol. 2004;61: Kleindorfer D, Kissela B, Schneider A, Woo D, Khoury J, Miller R, Alwell K, Gebel J, Szaflarski J, Pancioli A, Jauch E, Moomaw C, Shukla R, Broderick JP. Eligibility for recombinant tissue plasminogen activator in acute ischemic stroke: A population-based study. Stroke. 2004;35: e Qureshi AI, Suri MF, Nasar A, He W, Kirmani JF, Divani AA, Prestigiacomo CJ, Low RB. Thrombolysis for ischemic stroke in the united states: Data from national hospital discharge survey Neurosurgery. 2005;57: ; discussion Staffa JA. Gutierrez B KC. Outcome-based evaluation of a method for obtaining u.s. National estimates of inpatient drug utilization. Pharmacoepidemiology Drug Safety. 2003;12:S Steel RGD, Torrie JH, Dickey DA. Principles and Procedures of statistics. A biomedical approach. McGraw Hill; Demaerschalk BM, Durocher DL. How diagnosis-related group 559 will change the us medicare cost reimbursement ratio for stroke centers. Stroke. 2007;38:
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