Tyler R. Ross

The HMO Research Network Virtual Data Warehouse: A Public Data Model to Support Collaboration

The HMO Research Network (HMORN) Virtual Data Warehouse (VDW) is a public, non-proprietary, research-focused data model implemented at 17 health care systems across the United States. The HMORN has created a governance structure and specified policies concerning the VDW’s content, development, implementation, and quality assurance. Data extracted from the VDW have been used by thousands of studies published in peer-reviewed journal articles. Advances in software supporting care delivery and claims processing and the availability of new data sources have greatly expanded the data available for research, but substantially increased the complexity of data management. The VDW data model incorporates software and data advances to ensure that comprehensive, up-to-date data of known quality are available for research. VDW governance works to accommodate new data and system complexities. This article highlights the HMORN VDW data model, its governance principles, data content, and quality assurance procedures. Our goal is to share the VDW data model and its operations to those wishing to implement a distributed interoperable health care data system.

Spreading a Medical Home Redesign: Effects on Emergency Department Use and Hospital Admissions

PURPOSE The patient-centered medical home (PCMH) is being rapidly deployed in many settings to strengthen US primary care, improve quality, and control costs; however, evidence supporting this transformation is still lacking. We describe the Group Health experience in attempting to replicate the effects on health care use seen in a PCMH prototype clinic via a systemwide spread using Lean as the change strategy. METHODS We used an interrupted time series analysis with a patient-month unit of analysis over a 4-year period that included baseline, implementation, and stabilization periods for 412,943 patients. To account for secular trends across these periods, we compared changes in use of face-to-face primary care visits, emergency department visits, and inpatient admissions with those of a nonequivalent comparison group of patients served by community network practices. RESULTS After accounting for secular trends among network patients, patients empaneled to the PCMH clinics had 5.1% and 6.7% declines in primary care office visits in early and later stabilization years, respectively, after the implementation year. This trend was accompanied by a 123% increase in the use of secure electronic message threads and a 20% increase in telephone encounters. Declines were also seen in emergency department visits at 1 and 2 years (13.7% and 18.5%) compared with what would be expected based on secular trends in network practices. No statistically significant changes were found for hospital admissions. CONCLUSIONS The Group Health experience shows it is possible to reduce emergency department use with PCMH transformation across a diverse set of clinics using a clear change strategy (Lean) and sufficient resources and supports.

Impact on Seniors of the Patient-Centered Medical Home: Evidence From a Pilot Study

PURPOSE To assess the impact on health care cost and quality among seniors of a patient-centered medical home (PCMH) pilot at Group Health Cooperative, an integrated health care system in Washington State. DESIGN AND METHODS A prospective before-and-after evaluation of the experience of seniors receiving primary care services at 1 pilot clinic compared with seniors enrolled at the remaining 19 primary care clinics owned and operated by Group Health. Analyses of secondary data on quality and cost were conducted for 1,947 seniors in the PCMH clinic and 39,396 seniors in the 19 control clinics. Patient experience with care was based on survey data collected from 487 seniors in the PCMH clinic and of 668 in 2 specific control clinics that were selected for their similarities in organization and patient composition to the pilot clinic. RESULTS After adjusting for baseline, seniors in the PCMH clinic reported higher ratings than controls on 3 of 7 patient experience scales. Seniors in the PCMH clinic had significantly greater quality outcomes over time, but this difference was not significant relative to control. PCMH patients used more e-mail, phone, and specialist visits but fewer emergency services and inpatient admissions for ambulatory care sensitive conditions. At 1 and 2 years, the PCMH and control clinics did not differ significantly in overall costs. IMPLICATIONS A PCMH redesign can be associated with improvements in patient experience and quality without increasing overall cost.

Implementing Group Medical Visits for Older Adults at Group Health Cooperative

In a pair of randomized controlled trials in the Kaiser Permanente delivery system in Colorado in the 1990s, group visits for older adults (monthly non‐disease‐specific group medical appointments for a cohort of patients led by primary care teams) were proven to reduce costs, decrease hospitalizations, and improve patient and provider satisfaction. As part of a translational effort, this group visit intervention was replicated in a delivery system in Seattle, Washington, and the log of total healthcare costs was measured in the first year of the intervention. Utilization and patient and physician satisfaction were secondary outcomes. For the cost and utilization analysis, a retrospective case–control design compared 221 case patients aged 65 and older with high outpatient usage in the previous 18 months with 1,015 control patients selected randomly from clinics not participating in the intervention. Controls were matched to cases on the number of primary care visits in the prior 18 months. Total costs were not statistically different for intervention patients and controls (

Changes in Office Visit Use Associated With Electronic Messaging and Telephone Encounters Among Patients With Diabetes in the PCMH

8,845 vs

Spreading a Patient-Centered Medical Home Redesign A Case Study

10,288, P=.11), nor were there statistically significant differences in utilization, including hospital admissions and outpatient visits, but patient and provider satisfaction with the intervention was high. This translational effort did not demonstrate the cost savings of the original efficacy trials. Possible explanations for these divergent results may have to do with differences between those who participated and differences between the two delivery systems.

Implications of Reassigning Patients for the Medical Home: A Case Study

PURPOSE Telephone- and Internet-based communication are increasingly common in primary care, yet there is uncertainty about how these forms of communication affect demand for in-person office visits. We assessed whether use of copay-free secure messaging and telephone encounters was associated with office visit use in a population with diabetes. METHODS We used an interrupted time series design with a patient-quarter unit of analysis. Secondary data from 2008–2011 spanned 3 periods before, during, and after a patient-centered medical home (PCMH) redesign in an integrated health care delivery system. We used linear regression models to estimate proportional changes in the use of primary care office visits associated with proportional increases in secure messaging and telephone encounters. RESULTS The study included 18,486 adults with diabetes. The mean quarterly number of primary care contacts increased by 28% between the pre-PCMH baseline and the postimplementation periods, largely driven by increased secure messaging; quarterly office visit use declined by 8%. In adjusted regression analysis, 10% increases in secure message threads and telephone encounters were associated with increases of 1.25% (95% CI, 1.21%–1.29%) and 2.74% (95% CI, 2.70%–2.77%) in office visits, respectively. In an interaction model, proportional increases in secure messaging and telephone encounters remained associated with increased office visit use for all study periods and patient subpopulations (P <.001). CONCLUSIONS Before and after a medical home redesign, proportional increases in secure messaging and telephone encounters were associated with additional primary care office visits for individuals with diabetes. Our findings provide evidence on how new forms of patient-clinician communication may affect demand for office visits.

Accuracy and complexities of using automated clinical data for capturing chemotherapy administrations: implications for future research.

Health care leaders and policymakers are turning to the patient-centered medical home (PCMH) model to contain costs, improve the quality of care, and create a more positive primary care work environment. We describe how Group Health, an integrated delivery system, developed and implemented a PCMH intervention that included standardized structural and practice level changes. This intervention was spread to a diverse set of 26 primary care practices in 14 months using Lean Management principles. Group Healths experience provides valuable insights that can be used to improve the design and implementation of future PCMH models.

Effects of transitioning from conventional methods to liquid-based methods on unsatisfactory Papanicolaou tests: results from a multicenter US study

PURPOSE Improving patient-doctor continuity is one goal of the medical home, but achieving this goal may require physicians to reduce panel size. This article examines the impact on patient experience and utilization of Group Health Cooperative’s process of reassigning patients to new physicians as part of their medical home demonstration project. METHODS This work represents a subanalysis of the Group Health medical home pilot evaluation. Study participants include 8,005 adults who received primary care in 2006 and 2007 at an urban practice owned and operated by a not-for-profit integrated delivery system. Approximately one-quarter of patients were selected to be reassigned to a new physician. Primary care, emergency department, secure messaging, and telephone utilization were captured through automated sources. Patients’ experience was measured before and after implementation of the medical home for a subset of 1,098 patients. RESULTS Patients who were retained by their existing physicians were older, sicker, and had longer preexisting patient-doctor relationships. After reassignment, reassigned patients were less likely to use primary care services but equally likely to use the emergency department. They were no less satisfied with their care experience. CONCLUSIONS Informational and managerial continuity may mitigate deleterious effects of reassignment, but more must be done to actively bind reassigned patients to the medical home to improve relational continuity with younger, healthier patients.

Barriers and Facilitators to Team-Based Care in the Context of Primary Care Transformation

Background:Chemotherapy data are important to almost any study on cancer prognosis and outcomes. However, chemotherapy data obtained from tumor registries may be incomplete, and abstracting chemotherapy directly from medical records can be expensive and time consuming. Methods:We evaluated the accuracy of using automated clinical data to capture chemotherapy administrations in a cohort of 757 ovarian cancer patients enrolled in 7 health plans in the HMO Cancer Research Network. We calculated sensitivity and specificity with 95% confidence intervals of chemotherapy administrations extracted from 3 automated clinical data sources (Health Care Procedure Coding System, National Drug Codes, and International Classification of Diseases) compared with tumor registry data and medical chart data. Results:Sensitivity of all 3 data sources varied across health plans from 79.4% to 95.2% when compared with tumor registries, and 75.0% to 100.0% when compared with medical charts. The sensitivities using a combination of 3 data sources were 88.6% (95% confidence intervals: 85.7–91.1) compared with tumor registries and 89.5% (78.5–96.0) compared with medical records; specificities were 91.5% (86.4–95.2) and 90.0% (55.5–99.7), respectively. There was no difference in accuracy between women aged <65 and ≥65 years. Using one set of codes alone (eg, Health Care Procedure Coding System alone) was insufficient for capturing chemotherapy data at most health plans. Conclusions:While automated data systems are not without limitations, clinical codes used in combination are useful in capturing chemotherapy more comprehensively than tumor registry and without the need for costly medical record abstraction.