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Research ArticleOriginal Research

Effect of Retail Clinic Use on Continuity of Care Among Medicare Beneficiaries

N. Ogechi Abara, Nicole Huang, Mukaila A. Raji and Yong-Fang Kuo
The Journal of the American Board of Family Medicine July 2019, 32 (4) 531-538; DOI: https://doi.org/10.3122/jabfm.2019.04.180349
N. Ogechi Abara
From the Department of Internal Medicine, Division of Geriatrics (NOA, MAR), Sealy Center on Aging (MAR, YFK), School of Medicine (NH), and Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston, TX (MAR, YFK).
MD
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Nicole Huang
From the Department of Internal Medicine, Division of Geriatrics (NOA, MAR), Sealy Center on Aging (MAR, YFK), School of Medicine (NH), and Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston, TX (MAR, YFK).
BSc
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Mukaila A. Raji
From the Department of Internal Medicine, Division of Geriatrics (NOA, MAR), Sealy Center on Aging (MAR, YFK), School of Medicine (NH), and Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston, TX (MAR, YFK).
MD
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Yong-Fang Kuo
From the Department of Internal Medicine, Division of Geriatrics (NOA, MAR), Sealy Center on Aging (MAR, YFK), School of Medicine (NH), and Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston, TX (MAR, YFK).
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Abstract

Purpose: We examined the relationship between retail clinic use and primary care physician (PCP) continuity among Medicare enrollees in the Houston metropolitan area.

Methods: We identified retail clinic providers in the study area using a 2015 health care provider database. Medicare claims data from enrollees who received care from retail clinics in 2015 were compared with propensity score-matched sample of enrollees who received no care from retail clinics.

Results: There were 2.32 retail clinic visits per 1000 beneficiaries in a month. Approximately 1.3% of Medicare beneficiaries used retail clinics. Retail clinic users were more likely to be aged 65 to 74 years, female, White, and Medicaid ineligible. In multivariable analyses with adjustments for covariates, significant predictors of retail clinic use included having ≥3 chronic conditions (Odds Ratio [OR], 1.53 vs no condition), living within 1 mile of a retail clinic (OR, 2.44 vs living ≥5 miles), and having no PCP (OR, 1.11 vs having PCP). Compared with propensity-matched controls, among enrollees with an identified PCP, likelihood of seeing their PCP (OR, 0.82; 95% CI, 0.73 to 0.93) and continuity of care was lower (0.75 ± 0.33 vs 0.80 ± 0.31) if they had retail clinic visits.

Conclusions: Retail clinic use was lower in the elderly population compared with the previously published rate in the younger populations. The lower rate of continuity of care observed among retail clinic users is concerning, especially for those with chronic medical conditions.

  • Ambulatory Care
  • Chronic Disease
  • Medicare
  • Continuity of Patient Care
  • Patient-Centered Care
  • Primary Care Physicians
  • Primary Health Care
  • Retail Clinic
  • Nurse Practitioner

Retail clinics, first established in the United States in 2000,1 have by 2017 expanded to over 1960 US locations.2 Retail clinics represent a shift from traditional care delivery, being staffed mostly by nurse practitioners (NPs) and physician assistants (PAs) and located within retail stores.1 The clinics offer basic primary and acute care, such as vaccinations and treatment for mild acute conditions.3 Advantages of the retail clinic system include walk-in care and after-hour/weekend care.4,5 About 44% of all retail clinic visits occur when traditional primary care physicians' offices are closed.4 These clinics accept a large percentage of insurances and visits may cost less than at a traditional primary care physician's office.6 It is therefore not surprising that retail clinic use is growing quickly especially among the commercially insured working age population.7 This growth is likely to continue, given the recent expansion of multinational retail/pharmacy chains (eg, recent CVS/Aetna merger) into retail clinic business.8,9

While data exist on trends and outcomes of retail clinic use among the younger population and the commercially insured,3,7,10–11 little is known about retail clinic use among elderly Medicare beneficiaries. This population often has multiple coexisting chronic diseases (eg, congestive heart failure and diabetes mellitus) that require coordination and integration of care across many providers and health care settings. The extent of care coordination/integration between the retail clinic providers and the patient's primary care physician (PCP) is not clear. Continuity of primary care is particularly important for the elderly because of its association with fewer hospital/emergency room (ER) visits and lower health care costs.12

Several questions remain regarding retail clinic use by older Medicare beneficiaries. What is the profile of seniors who visit retail clinic for acute and chronic care? What proportion of seniors' retail clinic visit is for chronic disease management (CDM)? Is there any relationship between retail clinic use and continuity of care with the patient usual primary care physician? Answering these questions can guide policy makers, clinicians, health care payers, and health system leaders when developing changes to improve care among older retail clinic users.

The purposes of this study are to examine the geographic distribution and type of retail clinic providers (NP, PA, vs MD) in Houston metropolitan area, the sociodemographic and health characteristics associated with retail clinic use, and the relationship between retail clinic use and continuity of care.

Methods

Source of Data

We used the 100% Texas Medicare Claims (2014–2015), including Medicare beneficiary summary files, Medicare Provider Analysis and Review (MedPAR) files, Outpatient Standard Analytic Files, and Medicare Carrier files. Health care providers including physicians, NPs and PAs who practiced in retail clinics in the Houston Metropolitan area in 2015 were identified through a health care provider database from IMS Health. This database was generated primarily from National Provider Identifier (NPI) files, medical boards, state licensing, Drug Enforcement Administration (DEA), and provider directory from insurance companies. It includes provider NPI, practice identifier, practice name and address. We searched practice name for RediClinic, MinuteClinic, Health care Clinic, Walmart Care Clinic, Target Clinic, and The Little Clinic to identify health care providers with a primary practice location in retail clinics.

Study Cohorts

We selected Medicare beneficiaries residing in 9 counties of the Houston metropolitan area. Only those with Parts A and B coverage and not in a health maintenance organization (HMO) in 2015 were included (n = 366,225). Among these beneficiaries, 4706 had at least 1 retail clinic visit in 2015. To assess patients' chronic disease conditions, previous continuity of care, and whether they had an identified PCP, the study cohort was further restricted to those who had Part A and B coverage and were not in an HMO in 2014 as well (n = 322,994 including 4105 enrollees with retail clinic visits). Therefore, this cohort represents beneficiaries with continuous coverage in 2014 and 2015, allowing for analysis of beneficiaries' comorbidities, evidence of a PCP before the retail clinic visit in study year of 2015 and continuity of care.

Patient Characteristics

Medicare enrollment files provided information on patient age, gender, and race/ethnicity. We used a Medicaid indicator in the enrollment file as proxy for low income. We defined and classified 15 chronic conditions according to the classification scheme developed by the Department of Health and Human Services.13 Chronic conditions, number of hospitalizations, and number of provider visits were generated from the claims in 2014. We then assigned each patient to a PCP. We defined a PCP as a generalist (general practitioner, family physician, internist or geriatrician) who saw a given beneficiary on 2 or more occasions in an outpatient setting in 2014.14 If more than 1 PCP met criteria, the 1 who saw the beneficiary most often was assigned. If more than 1 PCP saw the beneficiary with the same frequency, the 1 saw the beneficiary most recently was assigned. For patients with at least 2 PCP visits in 2014, the Bice-Boxerman Continuity of Care Index (COC) for primary care was calculated.15 The distance between the nearest retail clinic and beneficiary's residential zip code was calculated and grouped as ≤1 mile, >1 to ≤5 miles, and >5 miles.

Study Outcome

Continuity of care assessed by determining whether beneficiaries had a visit to his/her identified PCP in 2015, and by their primary care COC in 2015. To reduce selection bias between beneficiaries who visited retail clinics and those who did not, we performed propensity score matching. The propensity score of having retail clinic visits was generated using 2 logistic regression models—one for those patients had an identified PCP, and another for those patients without an identified PCP. Patient characteristics including age, gender, race/ethnicity, Medicaid eligibility, number of chronic conditions, hospitalizations and health care provider visits in previous year, and distance to nearest retail clinic were included in each model. For each beneficiary with retail clinic visits, we performed greedy matching to select 3 beneficiaries without retail clinic visits.16 For this, a patient with retail clinic visit is first randomly selected. Then 3 patients without a retail clinic visit, each whose propensity score is closest to that of this randomly selected retail clinic patient, are chosen for matching to the retail clinic patient. This process is repeated for each retail clinic patient. Balance of covariates after propensity matching was assessed by standardized difference and by the overlap of propensity score.17

Statistical Analyses

Proportions of beneficiaries with retail clinic visits were calculated by each patient characteristic. The adjusted odds ratio (OR) and 95% confidence interval (CI) for each patient characteristic associated with retail clinic visit was estimated from a multivariate logistic regression model. For outcomes of study, a conditional logistic regression model was built to examine the association between retail clinic visits and whether patients saw their PCP in the propensity match cohort. All tests of statistical significance were 2-sided and analyses were performed with SAS 9.4 (SAS Inc., Cary, NC).

Results

Among 126 retail clinic providers (75% NPs) in Houston metropolitan area in 2015, 56% were in Harris County and about 12% in each of the suburban counties including Brazoria, Ford Bend, and Montgomery counties. Most of these providers practiced near the boundary of Harris County. Table 1 demonstrates profiles of retail clinic users in 2015. Overall, 1.3% of users were Medicare beneficiaries. Retail clinic users were more likely to be female, White, aged 65 to 74 years of age, and Medicaid ineligible. In the multivariable analyses, residents within 1 mile of the nearest retail clinic had nearly 2.5 times higher odds of using a retail clinic as those residing more than 5 miles away (OR, 2.47; 95% CI, 2.09 to 2.92). Patients without chronic conditions had lower odds of visiting retail clinics (OR, 0.70; 95% CI, 0.63 to 0.77) compared with those with 1 chronic condition). Medicare beneficiaries who had an identified PCP had lower odds of visiting a retail clinic in 2015 (OR, 0.9; 95% CI, 0.84 to 0.97). Seventy-one percent of patients with an identified PCP had only 1 PCP. Their COC index was much higher than those without an identified PCP (0.84 ± 0.26 vs 0.004 ± 0.059).

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Table 1.

Characteristics Associated with Retail Clinic Visits in the Entire Study Cohort

On a monthly basis in 2015, there were 2.32 retail clinic visits versus 242 PCP visits made per 1000 beneficiaries. About 24% of patients who went to retail clinics had received care over the weekend. The commonest reason for retail clinic was for vaccination (24.2% of total retail clinic visits), mostly against Influenza. When analyzed based on acuity and complexity, 36.8% were visits for simple acute conditions such as urinary tract infection, acute sinusitis, otitis media, allergic rhinitis, pneumonia, respiratory infection, and skin conditions. Chronic conditions (including congestive heart failure, hypertension, diabetes and chronic obstructive pulmonary disease), and preventive care accounted for about 13% of retail clinic visits (10% and 2.7% of visits, respectively).

As shown in Table 2, propensity score match analyses balanced baseline covariates between patients with and without retail clinic visits for both patients with an identified PCP and for patients without an identified PCP. Propensity scores between the 2 groups completely overlapped. However, the proportion of patients with a retail clinic visit who failed to see their PCP in 2015 was greater than that for those without visits to retail clinics (21.4% vs 18.3%). From the conditional logistic regression model, among beneficiaries with an identified PCP, the odds of seeing their PCP decreased if they had retail clinic visits (OR, 0.82; 95% CI, 0.73 to 0.93). We also found average COC indices in 2015 were lower in beneficiaries who used retail clinics, regardless of whether patients had an identified PCP or not (0.75 ± 0.33 vs 0.80 ± 0.31, P < .001, and 0.64 ± 0.40 vs 0.74 ± 0.37, P < .001).

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Table 2.

Comparisons Between Patients With Retail Clinic Visits and Patients Without Retail Clinic Visits Matched by Propensity Score

The type of care sought may be a significant factor contributing to patterns and magnitude of retail clinic use. This is important when considering its impact on continuity of care. In Table 3, we review data regarding the type of visit obtained (chronic/preventive care, simple/acute condition, or vaccination) at a retail clinic by Medicare beneficiaries in the study. A greater proportion (83.1%) of beneficiaries who sought care at a retail clinic for vaccination saw their PCP compared with the proportion of those who saw care for simple, acute conditions such as urinary tract infection and upper respiratory tract infection or for chronic conditions and preventive care (75.4% and 72.5%, respectively; P = .012). A greater continuity of care (COC) index was also demonstrated in the vaccination group at 0.8 (+0.31) while the COC for those seeking care for chronic conditions was 0.68 (+0.36; P = .0002).

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Table 3.

Comparisons Between Type of Retail Clinic Visit and Continuity of Care for Medicare Beneficiaries in 2015

Discussion

Our study revealed that in 2015, retail clinic providers in the Houston metropolitan area were located primarily in Harris County and 3 other suburban counties, and about 75% were NPs. The geographic distribution is similar to a 2010 study18 which found about 88% of retail clinic locations in urban high-income areas and about 13% in Health Profession Shortage Areas.18 This is concerning given that projections have considered retail clinic expansion as a means to increase health care access for the poor and the uninsured who are at high risk of unplanned ER visits for nonemergent care.18⇓–20

Our study population of elderly Medicare beneficiaries had 2.32 retail clinic visits per 1000 persons per month in 2015, a lower rate than that for the population aged 18 to 64 years (6.5 retail clinic visits per 1000 persons per month).7 Most retail clinic visits were for vaccinations and simple acute infections. However, 10% of seniors used retail clinic for CDM. Retail clinic users are more likely to be female, White, aged 65 to 74 years of age, and Medicaid ineligible; the reasons for these findings are unclear. However, prior research has shown that women and those aged 66 to 74 years had a greater likelihood of receiving care from NPs.21 It is also possible that Medicaid-eligible beneficiaries reside further away from the retail clinics, 88% of which are located in urban high-income areas.18 Living near a retail clinic was also associated with higher odds of use, a finding similar prior research in working age population.7

As expected, sicker seniors visited retail clinic more than healthy seniors. Those with a PCP had lower odds of retail clinic use while those without a PCP were more likely to use retail clinics, mostly for acute illnesses, similar to findings from prior research.3,7,10 Among beneficiaries with an identified PCP, the odds of seeing their PCP decreased if they had retail clinic visits. While retail clinic use was lower in the elderly population compared with the younger populations,7 our findings of minimal PCP followup raise concern about quality, coordination, and outcome of care among elderly retail clinic users.22,23 Prior research has published on the variability and pattern of PCP follow-up rates among retail clinic users.18

The finding of 10% retail clinic visits for CDM was unexpected. Optimal CDM for conditions, such as congestive heart failure, require a stable PCP to establish long-term patient-PCP interpersonal trust, to coordinate care and informational translation across multiple providers for preventive, acute, and chronic care needs.19,24 Continuity of care is key to health maintenance and the patient centered medical home, especially in Medicare patients with multimorbidity. There is potential for poor outcomes among those using retail clinics for CDM: comprehensive care approaches are less likely in the setting of a walk-in retail clinic visit model. Optimal CDM in elders often requires serial followup of guideline-recommended therapy, tests, medication reconciliation, consultant referrals, and advance directive discussion—tasks not easily accomplished in retail clinics. Our findings of retail clinic association with lower care continuity raise concern for care fragmentation and potential for missed diagnoses due to inadequate test followup, requiring additional health care services, including urgent ER transfer and subsequent hospitalizations.23,25

We acknowledge our finding that only 1.3% Medicare beneficiaries used retail clinics and that among that number, 10% of visits were for management of chronic conditions. This represents up to 0.13% of the studied Medicare beneficiaries who sought care at a retail clinic for chronic care management. While this number is small, if we extrapolate our result to the total 58 million Medicare beneficiaries in 2015, this represents nearly 75,400 patients potentially seeking care at retail clinics for chronic care. Overall, the population of Americans aged 65 years and older is expected to substantially increase as baby boomers (those born between 1945 and 1965) reach the age to qualify for Medicare. In addition, retail clinic use is also expected to increase as insurance companies encourage their use over the more expensive care sites such as emergency rooms or urgent care centers. Finally, our study is limited to 1 state and moreover, to 1 metropolitan region, Houston. Majority of care in retail clinics are provided by NPs; however, NP scope of practice in Texas is limited compared with other states in which NPs have autonomy. Thus, we believed the estimated 75,400 patients seeking care at a retail clinic for chronic care management may in fact be underestimated for the entire Medicare population. A national study covering retail clinics in states with different scope of practice regulations for NPs is needed.

Retail clinic use by Medicare beneficiaries will likely grow, so approaches to improve care coordination and communication between retail clinic providers and PCPs are needed. Possible approaches include the development of a visit scoring system to ensure that high-risk patients see their PCP within a week of retail clinic visit, provision of a clinic note record to the patient, informing the patient's PCP via email or text, and implementing integrated, portable, patient-accessible electronic medical records (EMRs) that communicate with other EMRs. Such EMR and care integration may be 1 advantage of the CVS/Aetna merger. The Aetna patient who visits a retail clinic in CVS may have their health data in 1 system. Another suggested approach is the expansion of hospital-based retail clinic models, which allow for easier, more direct access to specialists and other health care services for patients who have chronic disease exacerbations that do not require in-hospital care.27

Limitations in our study include the singular focus on older Medicare patients in the Houston metropolitan area and exclusion of HMO patients, thus limiting generalizability of our findings to younger patients or patients with fee-for-service Medicare coverage outside of Houston. The proportion of Medicare patients with both Part A and B coverage under fee-for-service was somewhat lower compared with National Medicare population (47.0% vs 54.5%). Study results are from 2015, and given the recent changes in health care landscape, the results may not necessarily be extrapolated to the current period. We may also have missed some patients who received care at previously operational retail clinics which have since closed. We lack key data on retail clinic practice: social/ functional measures of users, presence of EMR, NP experience, and care quality by NP versus MDs. These factors may potentially affect access to and quality of retail clinic care.

We acknowledge that patients who visit retail clinics may be referred for further care through emergency rooms and perhaps inpatient hospitalizations. While data exist regarding hospitalizations, cross-sectional analysis does not allow us to tease out timing related to the retail clinic visit (ie, whether a beneficiary was seen in emergency room/hospital before or after retail clinic visit). Further studies would benefit from longitudinal analysis over many years and of additional US states to enable review of longitudinal patterns and to ensure validity of any associations.

Nevertheless, our findings have health care policy implications, given the rapid rise in retail clinic use and the potential for care fragmentation in clinically complex elderly Medicare users. Primary care discontinuity among elderly retail clinic users in our study underscore the need for better systems to improve integration and coordination of retail clinic care. Such systems are key to reducing hospital, ER visits, and health care costs. Our findings also highlight the need for long-term national studies of the impact of retail clinic use and uncoordinated care or “visit entropy” on rehospitalizations and other outcomes that matter to clinically complex elders.28 Data from such studies can guide policy makers, health system leaders and clinicians on ways to improve quality and continuity of care among retail clinic users.

Notes

  • This article was externally peer reviewed.

  • Funding: This work was supported by Grants R01-HS020642 from the Agency for Healthcare Research and Quality, P30-AG024832 from the National Institute on Aging, and UL1-TR001439 from the National Center for Advancing Translational Sciences, National Institutes of Health. The funders had no role in the design and conduct of study; the collection, management, analysis, and interpretation of the data; or the preparation, review, or approval of the manuscript.

  • Conflict of interest: none declared.

  • To see this article online, please go to: http://jabfm.org/content/32/4/531.full.

  • Received for publication November 22, 2018.
  • Revision received February 10, 2019.
  • Accepted for publication February 11, 2019.

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The Journal of the American Board of Family     Medicine: 32 (4)
The Journal of the American Board of Family Medicine
Vol. 32, Issue 4
July-August 2019
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Effect of Retail Clinic Use on Continuity of Care Among Medicare Beneficiaries
N. Ogechi Abara, Nicole Huang, Mukaila A. Raji, Yong-Fang Kuo
The Journal of the American Board of Family Medicine Jul 2019, 32 (4) 531-538; DOI: 10.3122/jabfm.2019.04.180349

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Effect of Retail Clinic Use on Continuity of Care Among Medicare Beneficiaries
N. Ogechi Abara, Nicole Huang, Mukaila A. Raji, Yong-Fang Kuo
The Journal of the American Board of Family Medicine Jul 2019, 32 (4) 531-538; DOI: 10.3122/jabfm.2019.04.180349
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Keywords

  • Ambulatory Care
  • Chronic Disease
  • Medicare
  • Continuity of Patient Care
  • Patient-Centered Care
  • Primary Care Physicians
  • Primary Health Care
  • Retail Clinic
  • Nurse Practitioner

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