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1. Assessing the Impact of Indexing Performance Measure Codes on the Perceived Value of EPC Reports to Health Systems | Effective Health Care (EHC) Program
   effectivehealthcare.ahrq.gov/products/performance-measure-codes/method-report

2. S81 (pdf file)
   effectivehealthcare.ahrq.gov/sites/default/files/s81.pdf
   October 01, 2007 - Given approximately 20,000 ICD-9-CM codes in use, individual codes possibly predictive of a type of ADE … The complete list of codes is available from the authors. … These fields included adverse event codes. … We created dummy variables that aggregated the codes. … Because the at-risk indicator was positive if any of the selected codes were present, all codes had equal

3. Computerized Definitions Showed High Positive Predictive Values for Identifying Reasons for Hospitalizations in a Medicaid Population with Rheumatoid Arthritis (pdf file)
   effectivehealthcare.ahrq.gov/sites/default/files/pdf/rheumatoid-arthritis-hospitalizations_research.pdf
   October 01, 2008 - ICD9-CM Codes Used in Computerized Definitions ................................................... 8 … The PPV for pneumonia codes listed in the primary diagnosis field was 95% (95% CI: 90-98). … The PPV for codes in secondary fields was 75% (95% CI: 58-88). … diagnosis codes among hospitalized veterans. … Validation of diagnostic codes within medical services claims.

4. Diabetes-Foot-Ulcer-Amputation-Prevalence Research (pdf file)
   effectivehealthcare.ahrq.gov/sites/default/files/pdf/diabetes-foot-ulcer-amputation-prevalence_research.pdf
   February 01, 2011 - Algorithm 2: An individual was determined to have diabetes if he or she had two or more ICD-9 codes … consistent with diabetes or at least one inpatient claim with ICD-9 codes consistent with diabetes … consistent with diabetes or at least one inpatient claim with ICD-9 codes consistent with diabetes … PAD was ascertained based on the following ICD-9 codes: 250.70, 440.20-24, 443.9. … PAD was ascertained based on the following ICD-9 codes: 250.70, 440.20-24, 443.9. REFERENCES 1.

5. Diabetes-Foot-Ulcer-Amputation-Incidence Research (pdf file)
   effectivehealthcare.ahrq.gov/sites/default/files/pdf/diabetes-foot-ulcer-amputation-incidence_research.pdf
   January 01, 2011 - consistent with diabetes or at least one inpatient claim with ICD-9 codes consistent with diabetes … (84.10-17, 84.3), or ICD-9 diagnosis codes (895.0, 895.1, 896.0-3, 897.0-7, V497.0-6) and a previous … 6-month period without any of these CPT codes or ICD-9 codes. … The former set of ICD-9 codes represents the following macrovascular diseases: peripheral arterial … The latter set of ICD-9 codes represents the following microvascular diseases: diabetic renal disease

6. Icd-Categories-Prevalence-Reimbursement Research (pdf file)
   effectivehealthcare.ahrq.gov/sites/default/files/pdf/icd-categories-prevalence-reimbursement_research.pdf
   January 01, 2011 - supplementary classification of factors influencing health status and contact with health services (V-codes … The total per claim reimbursement was also greatest for V-codes, nearly $5,200 per skilled nursing … For each of the 18 ICD-9 chapters (plus E-codes), Table 2 lists the 3-digit ICD-9 categories representing … an d Neoplasms Nervous system diseases Complications of pregnancy, childbirth, and puerperium E-codes … ICD-9 chapters among skilled nursing facility claims 40 30 20 10 0 % 2006 2007 2008 2009 V-codes

7. Geographic Variation in Carotid Endarterectomy and Carotid Stenting Among Medicare Beneficiaries, 2003-2006 (pdf file)
   effectivehealthcare.ahrq.gov/sites/default/files/pdf/cardiology-health-outcomes_research.pdf
   July 01, 2010 - (codes 70498, 75660, 75662, 75665, 75671, 75676, and 75680). … , and 425.4-425.9), coronary artery disease (codes 410.x-414.x, 429.2, and V45.81), dementia (codes … 290.x, 294.1, and 331.2), diabetes mellitus (code 250), hypertension (codes 401-405 and 437.2), and … V43.4) and cerebrovascular disease (codes 434.x-438.x). … Accuracy of ICD-9-CM codes for identifying cardiovascular and stroke risk factors.

8. Reduction in Medication Use after Bariatric Surgery (pdf file)
   effectivehealthcare.ahrq.gov/sites/default/files/pdf/bariatric-surgery_research.pdf
   June 01, 2010 - Classification of Disease-9 Clinical Modification (ICD-9-CM) codes, National Drug Codes (NDC) or … Diagnosis Related Group (DRG) codes. … , prescription NDC codes, and costs and charges (submitted, allowed, and paid). … Bariatric Operations DRG codes 288 Procedures for Obesity Other CPT codes 43644 Laparoscopy, … treatment for disease who may not have been identified using ICD diagnosis codes).

9. REQUEST FOR TASK ORDER (pdf file)
   effectivehealthcare.ahrq.gov/sites/default/files/pdf/cancer-end-of-life-quality-meaures_research.pdf
   April 01, 2010 - Cancer type was defined by SEER histology codes. … retrospective cohort using Medicare J-codes for drugs used by Earle.8 Additional J-codes for chemotherapy … • PACE/ PAAD NDC codes for drugs listed in Appendix 2. … • PACE/ PAAD NDC codes for drugs listed in Appendix 2. … • Medicare claims ICD-9 diagnosis codes DRGs (36) Codes are documented in Appendix C.

10. Standardized Library of Asthma Outcome Measures (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/wysiwyg/white-paper-library-asthma.pdf
    April 01, 2019 - ) 2.16.840.1.113883.3.117.1.7.1.271 • Asthma (PCPI Foundation, 83 codes) 2.16.840.1.113883.3.526.3.362 … • Asthma Diagnosis Grouping (AAAAI, 104 codes) 2.16.840.1.113762.1.4.1047.309 • Preferred Asthma … Therapy (NCQA, 105 codes) 16.840.1.113883.3.464.1003.196.12.1212  Reasons for differences include … • +/- inclusion of retired codes. • Different groups find different codes. … • +/- inclusion on non-billable ICD codes.

11. Radiotherapy-Proton-Beam Research (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/radiotherapy-proton-beam_research.pdf
    May 01, 2012 - LCDs, which specify conditions for payment of claims, includ- ing acceptable procedure and diagnosis codes … APC codes 664 and 667 and HCPCS codes 77520, 77522, 77523, and 77525 are used to bill for proton beam … In cases where multiple diagnosis codes are associated with proton beam radiotherapy for a single … patient, we choose the most common diagnosis code within the neo- plasm range of ICD-9 codes (140-239 … We assigned proton beam recipients to their provider by matching ZIP Codes for service provid- ers

12. Diabetes-Foot-Ulcer-Amputation-Economics Research (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/diabetes-foot-ulcer-amputation-economics_research.pdf
    January 01, 2011 - diabetes if he or she had two or more claims with International Classification of Diseases (ICD-9) codes … consistent with diabetes or at least one inpatient claim with ICD-9 codes consistent with diabetes … nonprimary) diagnosis of foot ulcer during the given calendar year (based on the fol- lowing ICD-9 codes … Any benefi- ciary with diabetes and a venous leg ulcer (based on the following ICD-9 codes: 454.0, 454.1 … populations by the presence in an outpatient or carrier claim with one of the following procedure codes

13. Cancer-Drugs-Utilization-Cost Research (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/cancer-drugs-utilization-cost_research.pdf
    January 01, 2011 - HCPCS and CPT codes used to identify biologics of interest during the study period Biologic HCPCS … (e.g., J codes, A codes) and Current Procedural Terminology (CPT) codes (see Table 2). … Biologics were identified in Medicare Part D claims via National Drug Codes (NDCs) (codes available … When biologics are introduced to the market, they are often assigned nonspecific HCPCS codes (e.g … throughout the year; (b) used the CWF to extract all Parts A and B claims containing HCPCS or CPT codes

14. Ch 8-User-Guide-To-Ocer 130129 (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/ch_8-user-guide-to-ocer_130129.pdf
    October 01, 2013 - The ICD, Ninth Revision, Clinical Modification (ICD-9-CM) is the official system of assigning codes … The validity of codes for procedures exceeds the validity of diagnostic codes, as procedural billing … For diagnosis codes, however, a diagnosis that is under evaluation (e.g., a medical visit or a test … Food and Drug Administration (FDA) has authority over the NDC codes. … Validation of ICD-9-CM diagnostic codes for inflammatory bowel disease among veterans.

15. Use of and access to health care by Medicare beneficiaries with diabetes: impact of diabetes type and insulin use, 2007-2011 (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/diabetes-medicare-use_research.pdf
    January 01, 2014 - Persons with type 2 diabetes who had evidence of insulin use from HCPCS† codes in either the Carrier … eligibility status of each beneficiary, us- ing the monthly State Reported Dual Eligibility Status Codes … 90724, 90658, 90659, G0008, and 90656 to identify flu shots, and CPT codes 67028, 67030, 67031, 67036 … CPT codes 83036, 83037, 3044F, 3045F, 3046F, and 3047F were used to identify HbA1c tests, and CPT codes … First, our classification of diabetics is based on diagnosis codes and procedure codes related to insulin

16. Comparative Effectiveness of β-Adrenergic Antagonists on the Risk of Rehospitalization in Adults with Heart Failure (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/heart-failure-rehospitalization_research.pdf
    November 01, 2007 - These codes have been shown to have a positive predictive value of more than 95% for clinical heart … Relevant diagnoses were identified using ICD-9 codes and procedures were identified using both ICD-9 … - CM and current procedural terminology (CPT) codes. … ) Drugs: PIMS (Kaiser outpatient pharmacy database) (NDC Codes and AHFS Classifications) Harvard … Drugs: Pharmacy claims for filled prescriptions (NDC Codes and AHFS Classifications) 29 3

17. Enhanced Functionality for the Distributed Research Network Pilot (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/distributed-network-expansion_research.pdf
    April 01, 2012 - , inpatient procedure codes, and enrollment. … Changed “Outpatient Procedure Codes” to “ICD-9 Procedure Codes” throughout. … , inpatient procedure codes, and enrollment. … Parameters for ICD-9 procedure codes query Parameter Description Procedure Code List of procedure codes … codes and names.

18. Assessing the Impact of Indexing Performance Measure Codes on the Perceived Value of EPC Reports to Health Systems (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/methods-assessing-impact.pdf
    September 01, 2018 - Assessing the Impact of Indexing Performance Measure Codes on the Perceived Value of EPC Reports to Health … Systems Methods Research Report Assessing the Impact of Indexing Performance Measure Codes on the … Systems Methods Research Report Assessing the Impact of Indexing Performance Measure Codes … Assessing the Impact of Indexing Performance Measure Codes on the Perceived Value of EPC Reports to … University Health System Raleigh-Durham, NC vi Assessing the Impact of Indexing Performance Measure Codes

19. PHS 398 (Rev. 9/04), Continuation Page (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/pdf/administrative-data-validity_research.pdf
    January 01, 2007 - Table 1 includes diagnosis codes of interest and was developed in concert with an expert cardiologist … with attention to codes utilized in similar studies. … SCD/VA ICD-9 diagnosis codes ICD-9 Code Description 427.1 Paroxysmal Ventricular Tachycardia; Ventricular … Discussion: The positive predictive value (PPV) of SCD/VA diagnosis codes of 18% was much lower than

20. PHS 398 (Rev. 9/04), Continuation Page (pdf file)
    effectivehealthcare.ahrq.gov/sites/default/files/upenn-final-report-2005-certs-ce-supplement.pdf
    January 01, 2005 - Table 1 includes diagnosis codes of interest and was developed in concert with an expert cardiologist … with attention to codes utilized in similar studies. … SCD/VA ICD-9 diagnosis codes ICD-9 Code Description 427.1 Paroxysmal Ventricular Tachycardia; Ventricular … Discussion: The positive predictive value (PPV) of SCD/VA diagnosis codes of 18% was much lower than