Identifying newly approved medications in Medicare claims data: a case study using tocilizumab

ABSTRACT Background After U.S. licensure, parenterally administered medications are identified using non‐specific drug codes. Accurately identifying these medications is critical to safety and effectiveness research. Methods to identify medications prior to assignment of specific drug codes have not...

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Published inPharmacoepidemiology and drug safety Vol. 22; no. 11; pp. 1214 - 1221
Main Authors Curtis, Jeffrey R., Xie, Fenglong, Chen, Rui, Chen, Lang, Kilgore, Meredith L, Lewis, James D., Yun, Huifeng, Zhang, Jie, Wright, Nicole C., Delzell, Elizabeth
Format Journal Article
LanguageEnglish
Published Chichester Blackwell Publishing Ltd 01.11.2013
Wiley
Wiley Subscription Services, Inc
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Online AccessGet full text
ISSN1053-8569
1099-1557
1099-1557
DOI10.1002/pds.3475

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Abstract ABSTRACT Background After U.S. licensure, parenterally administered medications are identified using non‐specific drug codes. Accurately identifying these medications is critical to safety and effectiveness research. Methods to identify medications prior to assignment of specific drug codes have not been well described. Objectives To describe a generalized approach using non‐specific drug codes to identify parenteral therapies in Medicare claims and to assess the ability of that approach to identify tocilizumab (TCZ), a new biologic agent approved in 2010. Methods We used 2008–2010 Medicare data for a cohort of rheumatoid arthritis patients for algorithm development. Our algorithm classified non‐specific drug codes based upon: 1) ICD9 codes; 2) unit values (i.e. dose); 3) codes for infusion/injection procedures; 4) expected versus observed total reimbursement amount and reimbursement per unit. We assessed algorithm performance by linking to an arthritis registry to examine external validity. Results Of 472 803 claims with non‐specific drug codes, 9762 claims satisfied the TCZ algorithm. 74.3% of 9762 claims were classified as TCZ by exact unit price or allowed amount, 4.4% by unique doses, 21.3% by diagnosis code and small deviation from unit price or allowed amount. The algorithm demonstrated good performance characteristics: sensitivity 94% (95% CI 80–99), specificity 100% (99–100) and PPV 97% (84–100). Conclusion Claims‐based algorithms in Medicare or similar data systems can accurately identify newly approved biologics administered parenterally prior to the assignment of specific drug codes. Copyright © 2013 John Wiley & Sons, Ltd.
AbstractList After U.S. licensure, parenterally administered medications are identified using non-specific drug codes. Accurately identifying these medications is critical to safety and effectiveness research. Methods to identify medications prior to assignment of specific drug codes have not been well described. To describe a generalized approach using non-specific drug codes to identify parenteral therapies in Medicare claims and to assess the ability of that approach to identify tocilizumab (TCZ), a new biologic agent approved in 2010. We used 2008-2010 Medicare data for a cohort of rheumatoid arthritis patients for algorithm development. Our algorithm classified non-specific drug codes based upon: 1) ICD9 codes; 2) unit values (i.e. dose); 3) codes for infusion/injection procedures; 4) expected versus observed total reimbursement amount and reimbursement per unit. We assessed algorithm performance by linking to an arthritis registry to examine external validity. Of 472 803 claims with non-specific drug codes, 9762 claims satisfied the TCZ algorithm. 74.3% of 9762 claims were classified as TCZ by exact unit price or allowed amount, 4.4% by unique doses, 21.3% by diagnosis code and small deviation from unit price or allowed amount. The algorithm demonstrated good performance characteristics: sensitivity 94% (95% CI 80-99), specificity 100% (99-100) and PPV 97% (84-100). Claims-based algorithms in Medicare or similar data systems can accurately identify newly approved biologics administered parenterally prior to the assignment of specific drug codes.
ABSTRACT Background After U.S. licensure, parenterally administered medications are identified using non‐specific drug codes. Accurately identifying these medications is critical to safety and effectiveness research. Methods to identify medications prior to assignment of specific drug codes have not been well described. Objectives To describe a generalized approach using non‐specific drug codes to identify parenteral therapies in Medicare claims and to assess the ability of that approach to identify tocilizumab (TCZ), a new biologic agent approved in 2010. Methods We used 2008–2010 Medicare data for a cohort of rheumatoid arthritis patients for algorithm development. Our algorithm classified non‐specific drug codes based upon: 1) ICD9 codes; 2) unit values (i.e. dose); 3) codes for infusion/injection procedures; 4) expected versus observed total reimbursement amount and reimbursement per unit. We assessed algorithm performance by linking to an arthritis registry to examine external validity. Results Of 472 803 claims with non‐specific drug codes, 9762 claims satisfied the TCZ algorithm. 74.3% of 9762 claims were classified as TCZ by exact unit price or allowed amount, 4.4% by unique doses, 21.3% by diagnosis code and small deviation from unit price or allowed amount. The algorithm demonstrated good performance characteristics: sensitivity 94% (95% CI 80–99), specificity 100% (99–100) and PPV 97% (84–100). Conclusion Claims‐based algorithms in Medicare or similar data systems can accurately identify newly approved biologics administered parenterally prior to the assignment of specific drug codes. Copyright © 2013 John Wiley & Sons, Ltd.
Background After U.S. licensure, parenterally administered medications are identified using non-specific drug codes. Accurately identifying these medications is critical to safety and effectiveness research. Methods to identify medications prior to assignment of specific drug codes have not been well described. Objectives To describe a generalized approach using non-specific drug codes to identify parenteral therapies in Medicare claims and to assess the ability of that approach to identify tocilizumab (TCZ), a new biologic agent approved in 2010. Methods We used 2008-2010 Medicare data for a cohort of rheumatoid arthritis patients for algorithm development. Our algorithm classified non-specific drug codes based upon: 1) ICD9 codes; 2) unit values (i.e. dose); 3) codes for infusion/injection procedures; 4) expected versus observed total reimbursement amount and reimbursement per unit. We assessed algorithm performance by linking to an arthritis registry to examine external validity. Results Of 472803 claims with non-specific drug codes, 9762 claims satisfied the TCZ algorithm. 74.3% of 9762 claims were classified as TCZ by exact unit price or allowed amount, 4.4% by unique doses, 21.3% by diagnosis code and small deviation from unit price or allowed amount. The algorithm demonstrated good performance characteristics: sensitivity 94% (95% CI 80-99), specificity 100% (99-100) and PPV 97% (84-100). Conclusion Claims-based algorithms in Medicare or similar data systems can accurately identify newly approved biologics administered parenterally prior to the assignment of specific drug codes. Copyright © 2013 John Wiley & Sons, Ltd. [PUBLICATION ABSTRACT]
After U.S. licensure, parenterally administered medications are identified using non-specific drug codes. Accurately identifying these medications is critical to safety and effectiveness research. Methods to identify medications prior to assignment of specific drug codes have not been well described.BACKGROUNDAfter U.S. licensure, parenterally administered medications are identified using non-specific drug codes. Accurately identifying these medications is critical to safety and effectiveness research. Methods to identify medications prior to assignment of specific drug codes have not been well described.To describe a generalized approach using non-specific drug codes to identify parenteral therapies in Medicare claims and to assess the ability of that approach to identify tocilizumab (TCZ), a new biologic agent approved in 2010.OBJECTIVESTo describe a generalized approach using non-specific drug codes to identify parenteral therapies in Medicare claims and to assess the ability of that approach to identify tocilizumab (TCZ), a new biologic agent approved in 2010.We used 2008-2010 Medicare data for a cohort of rheumatoid arthritis patients for algorithm development. Our algorithm classified non-specific drug codes based upon: 1) ICD9 codes; 2) unit values (i.e. dose); 3) codes for infusion/injection procedures; 4) expected versus observed total reimbursement amount and reimbursement per unit. We assessed algorithm performance by linking to an arthritis registry to examine external validity.METHODSWe used 2008-2010 Medicare data for a cohort of rheumatoid arthritis patients for algorithm development. Our algorithm classified non-specific drug codes based upon: 1) ICD9 codes; 2) unit values (i.e. dose); 3) codes for infusion/injection procedures; 4) expected versus observed total reimbursement amount and reimbursement per unit. We assessed algorithm performance by linking to an arthritis registry to examine external validity.Of 472 803 claims with non-specific drug codes, 9762 claims satisfied the TCZ algorithm. 74.3% of 9762 claims were classified as TCZ by exact unit price or allowed amount, 4.4% by unique doses, 21.3% by diagnosis code and small deviation from unit price or allowed amount. The algorithm demonstrated good performance characteristics: sensitivity 94% (95% CI 80-99), specificity 100% (99-100) and PPV 97% (84-100).RESULTSOf 472 803 claims with non-specific drug codes, 9762 claims satisfied the TCZ algorithm. 74.3% of 9762 claims were classified as TCZ by exact unit price or allowed amount, 4.4% by unique doses, 21.3% by diagnosis code and small deviation from unit price or allowed amount. The algorithm demonstrated good performance characteristics: sensitivity 94% (95% CI 80-99), specificity 100% (99-100) and PPV 97% (84-100).Claims-based algorithms in Medicare or similar data systems can accurately identify newly approved biologics administered parenterally prior to the assignment of specific drug codes.CONCLUSIONClaims-based algorithms in Medicare or similar data systems can accurately identify newly approved biologics administered parenterally prior to the assignment of specific drug codes.
Author Yun, Huifeng
Curtis, Jeffrey R.
Xie, Fenglong
Chen, Lang
Lewis, James D.
Wright, Nicole C.
Kilgore, Meredith L
Zhang, Jie
Chen, Rui
Delzell, Elizabeth
AuthorAffiliation 1 University of Alabama at Birmingham; Birmingham AL
2 Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania
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CitedBy_id crossref_primary_10_3899_jrheum_191326
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10.1002/art.23417
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Issue 11
Keywords Tocilizumab
Diseases of the osteoarticular system
Autoimmune disease
Inflammatory joint disease
Monoclonal antibody
linkage
Epidemiology
Drug
Immunopathology
Health insurance
registry
Medicare
biologics
Treatment efficiency
Part D
certolizumab
Pharmacovigilance
Denosumab
Parenteral administration
pharmacoepidemiology
Case study
Immunomodulator
Chronic
Treatment
Register
Rheumatoid arthritis
Immunosuppressive agent
tocilizumab
rheumatoid arthritis
denosumab
Language English
License http://onlinelibrary.wiley.com/termsAndConditions#vor
CC BY 4.0
Copyright © 2013 John Wiley & Sons, Ltd.
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References Curtis JR, Jain A, Askling J, Bridges SL, Jr., Carmona L, Dixon W, et al.A comparison of patient characteristics and outcomes in selected European and U.S. rheumatoid arthritis registries. Semin Arthritis Rheum 2010; 40(1): 2-14 e1.
Kremer JM. The CORRONA database. Autoimmun Rev 2006; 5(1): 46-54.
DiMartino LD, Curtis LH, Williams RL, et al. Using medicare administrative data to conduct postmarketing surveillance of follow-on biologics: issues and opportunities. Food Drug Law J 2008; 63(4): 891-900.
Cohen SB, Dore RK, Lane NE, Ory PA, Peterfy CG, Sharp JT, et al. Denosumab treatment effects on structural damage, bone mineral density, and bone turnover in rheumatoid arthritis: a twelve-month, multicenter, randomized, double-blind, placebo-controlled, phase II clinical trial. Arthritis Rheum 2008;58(5):1299-1309.
Curtis JR, Yun H, Matthews R, Saag KG, Delzell E. Adherence with intravenous zoledronate and intravenous ibandronate in the United States Medicare population. Arthritis Care Res (Hoboken) 2012; 64(7): 1054-1060.
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References_xml – reference: Curtis JR, Jain A, Askling J, Bridges SL, Jr., Carmona L, Dixon W, et al.A comparison of patient characteristics and outcomes in selected European and U.S. rheumatoid arthritis registries. Semin Arthritis Rheum 2010; 40(1): 2-14 e1.
– reference: Kremer JM. The CORRONA database. Autoimmun Rev 2006; 5(1): 46-54.
– reference: Cohen SB, Dore RK, Lane NE, Ory PA, Peterfy CG, Sharp JT, et al. Denosumab treatment effects on structural damage, bone mineral density, and bone turnover in rheumatoid arthritis: a twelve-month, multicenter, randomized, double-blind, placebo-controlled, phase II clinical trial. Arthritis Rheum 2008;58(5):1299-1309.
– reference: DiMartino LD, Curtis LH, Williams RL, et al. Using medicare administrative data to conduct postmarketing surveillance of follow-on biologics: issues and opportunities. Food Drug Law J 2008; 63(4): 891-900.
– reference: Curtis JR, Yun H, Matthews R, Saag KG, Delzell E. Adherence with intravenous zoledronate and intravenous ibandronate in the United States Medicare population. Arthritis Care Res (Hoboken) 2012; 64(7): 1054-1060.
– volume: 58
  start-page: 1299
  issue: 5
  year: 2008
  end-page: 1309
  article-title: Denosumab treatment effects on structural damage, bone mineral density, and bone turnover in rheumatoid arthritis: a twelve‐month, multicenter, randomized, double‐blind, placebo‐controlled, phase II clinical trial
  publication-title: Arthritis Rheum
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  article-title: Using medicare administrative data to conduct postmarketing surveillance of follow‐on biologics: issues and opportunities
  publication-title: Food Drug Law J
– volume: 64
  start-page: 1054
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Snippet ABSTRACT Background After U.S. licensure, parenterally administered medications are identified using non‐specific drug codes. Accurately identifying these...
After U.S. licensure, parenterally administered medications are identified using non-specific drug codes. Accurately identifying these medications is critical...
Background After U.S. licensure, parenterally administered medications are identified using non-specific drug codes. Accurately identifying these medications...
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SubjectTerms Algorithms
Antibodies, Monoclonal, Humanized - administration & dosage
Antibodies, Monoclonal, Humanized - therapeutic use
Arthritis, Rheumatoid - drug therapy
Biological and medical sciences
biologics
certolizumab
Clinical Coding
Clinical trial. Drug monitoring
Cohort Studies
Databases, Factual
denosumab
Diseases of the osteoarticular system
Drug Approval
Drug therapy
General pharmacology
Humans
Inflammatory joint diseases
Injections
Insurance, Health, Reimbursement - statistics & numerical data
linkage
Medical coding
Medical sciences
Medicare
Part D
pharmacoepidemiology
Pharmacoepidemiology - methods
Pharmacology. Drug treatments
Registries
registry
rheumatoid arthritis
Sensitivity and Specificity
tocilizumab
United States
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Title Identifying newly approved medications in Medicare claims data: a case study using tocilizumab
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