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TeDia - A Telemedicine-Based Treatment Model for Inpatient and Interprofessional Diabetes Care

Authors Röhling M, Redaélli M, Simic D, Lorrek K, Samel C, Schneider P, Kempf K, Stock S, Martin S

Received 5 September 2019

Accepted for publication 25 October 2019

Published 29 November 2019 Volume 2019:12 Pages 2479—2487


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Prof. Dr. Juei-Tang Cheng

Martin Röhling,1,* Marcus Redaélli,2,* Dusan Simic,2 Kristina Lorrek,2 Christina Samel,3 Paul Schneider,4 Kerstin Kempf,1 Stephanie Stock,2 Stephan Martin1,5

1West-German Center of Diabetes and Health, Düsseldorf Catholic Hospital Group, Düsseldorf, Germany; 2Institute of Health Economics and Clinical Epidemiology, University Hospital of Cologne, Cologne, Germany; 3Institute of Medical Statistics and Computational Biology, Faculty of Medicine, University of Cologne, Cologne, Germany; 4Düsseldorf Catholic Hospital Group, Düsseldorf, Germany; 5Faculty of Medicine, Heinrich Heine University Düsseldorf, Düsseldorf, Germany

*These authors contributed equally to this work

Correspondence: Martin Röhling
West-German Centre of Diabetes and Health, Düsseldorf Catholic Hospital Group, Hohensandweg 37, Düsseldorf 40591, Germany
Tel +49 211-56 60 360 76
Fax +49 211-56 60 360 72

Introduction: The proportion of hospitalized patients with diabetes as a secondary diagnosis increases continuously. Therefore, we have developed a team-based interprofessional and telemedicine-based diabetes management system named TeDia (“Telemedical Diabetology”) and implemented it in an inpatient setting. The aim of the retrospective real-world study was to show the clinical impact of TeDia following its implementation.
Material and methods: TeDia is characterized by an interpersonal and telemedicine-based exchange of hospital routine data between specially trained nurses (“diabetes managers”) and external diabetologists. It was implemented in three acute hospitals of the Düsseldorf Catholic Hospital Group in Düsseldorf, Germany. Clinical awareness of diabetes, diabetes-related complications and diagnosis-related group (DRG)-based revenues were analyzed using ICD routine coding. Furthermore, the frequency of HbA1c determinations as well as hospitalization days were investigated.
Results: Before (2010), during (2012) and after the implementation of TeDia (2014), the number of patients with ICD coding for diabetes, decompensated diabetes, diabetic neuropathy, diabetic nephropathy as well as complicated diabetes increased by +18%, +93%, +101%, +113% and +89%, respectively. Using the same DRG grouper, revenues increased by +53% (from 27 (2013) to 42 (2014) DRG points). Frequency of HbA1c determinations rose by +85%, whereas the time for an average length of stay decreased by −12% (−0, 91 days) in comparison to patients without diabetes.
Conclusion: TeDia improved clinical awareness for diabetes and its complications. This new treatment model increased revenues and reduced hospital days indicating enhanced treatment quality. Our findings emphasize the necessity of novel technologies in inpatient settings for the improvement of efficacy, safety and efficiency of diabetes care.

Keywords: telemedicine, diabetes, inpatient care


Since its introduction in 2003 and 2004, the German diagnosis-related group (G-DRG) has been used to bill inpatient service.1 The DRG distinguishes between main (reason for inpatient stay) and secondary diagnoses. While patients with the main diagnosis diabetes receive quality-assured care according to their metabolic state, those with the secondary diagnosis diabetes are treated on the reason for the admission. Moreover, the prevalence of patients with a secondary diagnosis of diabetes has steadily increased in German hospitals in the past decades.24 Nevertheless, diabetes has lost its importance as a primary diagnosis for hospital admissions and changed into a predominant field of outpatient care at the same time.5 These changes have contributed to serious consequences, as recent studies show that uncontrolled hyperglycemia in hospitalized patients with or without a previous diagnosis of diabetes is associated with adverse outcomes and extended hospital days.6 Furthermore, it is known that adequate diabetes treatment can delay or even prevent complications resulting in a decrease of morbidity and mortality in addition to substantial cost savings.710 However, many diabetes patients do not receive adequate treatment, such as a treatment based on the “insulin sliding scale”,5 or no treatment at all.11 Therefore, a substantial proportion of patients remain undiagnosed during their hospital stay.12,13 Further factors, which are disadvantageous for an adequate inpatient diabetes treatment, comprise: (i) lack of time of physicians for providing diabetes-related information,14 (ii) an inefficient screening procedure, and (iii) coding of diabetes and its complications.15 However, there is evidence that the collaboration of an interprofessional and interdisciplinary team, consisting of physicians and non-physician staff, can improve patient education and diabetes care in an inpatient setting.16,17 Moreover, a recently published study demonstrated that a multidisciplinary team approach could reduce the rate of readmission into hospitals caused by acute glycaemic events.18 Additionally, previous studies have shown that appropriately trained or specialised non-medical staff can also provide high quality care in comparison to physicians.1923 Based on this background, we have developed an interprofessional and telemedicine-based diabetes management system named TeDia (“telemedical diabetology”) and implemented it in three hospitals of the Düsseldorf Catholic Hospital Group in Düsseldorf, Germany. In the present study we hypothesized that the implementation of TeDia: (i) improves awareness of diabetes, (ii) reduces hospital days as a consequence of improved treatment quality, and (iii) leads to improved revenues due to a better ICD coding.

Materials and Methods

TeDia System

The TeDia system consists of two components: (1) screening for diabetes-related complications such as nephropathy or foot ulcers in known diabetes (secondary diagnosis) or screening for unknown diabetes through conspicuous laboratory findings or anamnesis, and (2) telemedical therapy support for diabetes and its complications during hospitalization. The inpatient care was provided by 2 senior physicians with additional diabetes qualifications (diabetologists ≙ internists who are specially trained in diabetes) and 5 nurses who have been trained in diabetes (not academic). Approximately 50–60 patients were treated per day in the three acute hospitals, of which only 8–10% were not followed-up. The main reasons for not performing follow-ups were that family doctors did not want it or the patients had no interest in it. All patients with the secondary diagnosis diabetes were visited by nurses specially trained in diabetes (“diabetes managers”) at their day of hospital admission. In addition to this, all patients were screened for undiagnosed diabetes by performing glucose monitoring at admission day. The diabetes managers conducted a personal interview with the patients with the secondary diagnosis diabetes including questions about diabetes history, current therapy and diabetes-related complications. These data were transferred in a structured manner into the database (‘Diabetes-Information-System (DIS)) of TeDia. Moreover, foot inspection and screening for diabetic neuropathy were performed and the results were incorporated into an electronic file in DIS. In case of insulin therapy, injections sites were inspected. Furthermore, diabetes managers had the permission to request HbA1c, blood lipid and microalbuminuria measurements. All diabetes-related laboratory values were automatically transferred to TeDia, including the blood glucose values at the wards. These data were checked by a team of diabetologist and specialized nurses of the West-German Centre of Diabetes and Health in Düsseldorf, Germany, which had an external access to DIS. After checking the data, diabetes therapy was adjusted by the diabetologists, when necessary. In case of a conventional insulin therapy or decompensated metabolic control, patients received a basal-bolus regimen. Insulin adaptation plans were created and adapted day-to-day telemedically based on the current blood glucose monitoring at the ward during the hospital stay by diabetologists. The diabetes managers at the ward ensured that adaptations of insulin dosing were implemented and discussed with the resident physician. All internal and external information, including changes of diabetes therapy, were documented and transferred to TeDia. A comprehensive report for the family doctors was prepared at the end of the hospital stay. The TeDia system and its interrelationships are illustrated in Figure 1.

Figure 1 Model of the TeDia system and its interrelationships. Diabetes managers are nurses specially trained in diabetes.

Study Design and Population

The design of a retrospective observational study in a pre-post-interventional format was chosen to investigate the effects of telemedical diabetes care. The TeDia system was implemented in three acute hospitals of the Düsseldorf Catholic Hospital Group from 2011 to 2012. General routine data were analyzed to evaluate TeDia using age, sex, hospital division, diagnosis-related group (DRG) coding, time of hospital stay and laboratory data (e.g. HbA1c). These data were recorded from all patients with a secondary diagnosis of diabetes and an inpatient stay before (2010), during (2012), and after (2014) implementation of TeDia. We chose 2010 as baseline, as this year was a representative year for the three acute hospitals before the implementation of TeDia. The year 2012 can be seen as a midpoint of our study and further interpreted as a “learning year” for implementing all “TeDia processes” into daily clinical practice. Persons were verified as diabetes patients by either their medical or personal anamnesis as well as via HbA1c determination. HbA1c analyses were performed when one single elevated blood glucose value was larger than 150 mg/dl during the hospital stay. Calculations of G-DRG-based revenues were performed with the identical DRG grouper within the observation period. DRG coding guarantees - in principle fixed - prices for invoices and each DRG code has a specific economic case value, which is multiplied with a base rate which is up to now specific for each hospital. Furthermore, the study investigators had full access to all routine data. The present retrospective observational study was conducted in accordance with the current ethical standards laid down in the 2013 Declaration of Helsinki. Approval of the research protocol was obtained from the ethics committee of the Medical Council North Rhine (Ärztekammer Nordrhein No. 2011294).


In order to analyze the efficiency and quality of care provided by TeDia, the change in service delivery in the secondary diagnosis of diabetes and the quality of coding for the diagnosis of diabetes were observed. In detail, we investigated our data regarding: (i) absolute and relative change of the secondary diagnosis diabetes, (ii) uncomplicated and complicated as well as (iii) decompensated diabetes. Furthermore, we have analyzed the coding of (iv) diabetic nephropathy and diabetic neuropathy diagnoses as well as the amount of (v) HbA1c determinations, which can be used as a surrogate marker for care quality. To evaluate the economic change due to the implementation of TeDia, we analyzed the (vi) absolute and relative change of time for a hospital stay as well as the (vii) revenues as a result of an improved coding.

All treatment cases per calendar year were taken into account. Patients who have been re-admitted within 30 days of discharge were treated as the same treatment case. Patients who were above the turn of the year were assigned to the payroll year and, as consequence, double treatment cases are excluded.


Data are presented as means or percentages. We did not perform a priori sample size calculation, as we intended to examine all patients with a secondary diagnosis diabetes within the implementation phase of TeDia from 2010 to 2014. The collective was recruited from three acute hospitals. Unlike special clinics, these hospitals do not allow patients to plan ahead. Therefore, no standardization was possible. As a result, an exclusively descriptive evaluation without significance representation was chosen. Thus, only clinical trends were described in this article. All analyses were performed using SPSS 22.0 (SPSS Inc., Chicago, IL, USA) and GraphPad Prism 6.04 (GraphPad Software, San Diego, CA, USA).


The baseline survey (before the introduction of TeDia) is 2010, from which, with the exception of the coding of “uncomplicated diabetes”, a steady increase can be read over the dates (2012 and 2014) (Figure 2). The number of secondary diagnoses “diabetes” rose by 18% or by 1028 treatment cases in 2014 compared with the base year 2010. The diagnoses “decompensated diabetes” or “complicated diabetes” also almost doubled. The diagnosis “complicated diabetes” increased by 89% or 1468 treatment cases, “decompensated diabetes” by 93% or 960 treatment cases. On the other hand, the diagnosis “uncomplicated diabetes” decreased continuously by 605 treatment cases. This corresponds to a decrease of 13% from the base year 2010 to 2014. For a comparison of the coding change of the study collective, reference is made to the prevalence compared to the number of treatment cases. While treatment cases increased by 4% between 2010 and 2014, diabetes was diagnosed 16% more frequently during the same period.

Figure 2 Frequency of diabetes-related diagnoses. Illustrated are absolute changes from 2010 to 2014 regarding (A) secondary diagnosis diabetes, (B) uncomplicated diabetes, (C) complicated diabetes, (D) decompensated diabetes, (E) neuropathy and (F) nephropathy.

In addition, the TeDia system also increased the identification rate of diabetes-related complications such as neuropathy and nephropathy. The identification rate of neuropathy increased by +101% or 273 cases from 2010 to 2014. Diabetes-related nephropathy was more than doubled with an increase of +113% and 624 cases respectively. After adjustment of the number of diagnosed diabetes-related complications to the frequency of the secondary diagnosis diabetes, the frequency of the complications considered here per diabetes diagnosis increased by +4%, +8% and +12% respectively for neuropathy, nephropathy and decompensated diabetes (Supplementary Figure 1).

A look at the length of hospital stay shows that the trend towards shorter hospital stays among patients with diabetes is stronger. While a decrease of 9% or 0.54 days can be observed in patients without diabetes, patients with diabetes have a shortened length of stay of 12% or 0.91 days (Figure 3). Accordingly, the revenue for patients with diabetes also shifted. The cost weight points (G-DRG points) increased relatively (absolutely) by +53% (from 27.36 (2013) to 41.95 (2014) DRG points) and the frequency of HbA1c determinations rose relatively (absolutely) by +85% (n=6900) as illustrated in Figure 4.

Figure 3 Length and relative change of hospital stay. Illustrated are the (A) absolute values and (B) the relative change of time from 2010 to 2014 regarding the average hospital stay for patients with or without diabetes.

Figure 4 Treatment quality and revenues. Both graphs show the (A) absolute change of HbA1c determination and (B) revenues by adjusted coding from 2010 to 2014.


In the present study, the implementation of TeDia, a team-based interprofessional and telemedicine-based diabetes management system, led to an improved awareness of diabetes and its complications in an inpatient setting. Previously published works24 underpin our findings showing that a transition from a paper-based approach to a virtual glucose management service can reduce the proportion of hyperglycemic and hypoglycemic episodes in patients with diabetes by −39% and −36%, respectively.25,26

Furthermore, the results indirectly indicate an improved inpatient diabetes treatment quality due to the reduction of the length of hospital stay in patients with diabetes compared to patients without diabetes. These findings are supported by another telemedicine-based intervention study, which took place in an outpatient setting.27 In this study, a telemedicine-based intervention with standard care led to a reduction in length of hospital stay compared to a control group with standard care in patients with chronic diseases (e.g. diabetes).27

Moreover, an important factor for the positive changes following the TeDia implementation could be the beneficial interaction between physicians and physician assistants, nurses or other health professionals. In line with this, studies have shown that a team-based and interprofessional diabetes care can effectively improve the treatment of patients with type 128 and type 2 diabetes.29

The West-German Centre of Diabetes and Health has developed a telemedicine-based system that considers all forms of diabetes and its complications. Given the complexity of diabetes, a variety of health care professionals, such as general practitioners or family doctors, diabetologists, nurses, dietitians, and podiatrists are needed to ensure an adequate and complete diabetes treatment. The present study indicates that appropriately trained medical staff can safely provide and improve inpatient diabetes care quality. An extended role of non-physician staff leads to more available time for patient care and allows physicians to focus on more complex medical issues.30 At the same time, non-physician team members can take over the tasks of providing diabetes education and screening of newly hospitalized patients.31

A further benefit of the implementation of TeDia was that it increased the revenues for the hospitals due to a better ICD coding and a reduction of length of hospital stay. To date, global diabetes-related costs are estimated to be around 12% of the entire health care expenditures per year32 with the largest proportions of costs related to the treatment of diabetes complications.33,34

It is known that adequate diabetes treatment can delay or even prevent diabetes-related complications resulting in substantial cost savings.35,36 In the present study, cost savings were accompanied by an enhanced treatment quality. The increased number of HbA1c determinations as well as the decrease in length of hospital stay in patients with diabetes, even in comparison to non-diabetic patients, suggest that TeDia might improve the inpatient treatment and process quality. Moreover, the implementation of the basal-bolus regimen in the daily routine led to a further progress in therapy quality. Several studies have shown that the change from the sliding scale insulin treatment to the basal-bolus regimen contributes to an increased treatment quality in patients with diabetes.3537

There are strengths and limitations in our study that should be mentioned. The present study was designed with a pre-post cross-sectional approach basing only on secondary data due to legal restrictions. Thus, the process evaluation in the present study for treatment quality was limited to the data regarding the amount of HbA1c determinations and average length of hospital stay, which have shown to be two reliable parameters. Future studies could also include more subjective data, such as opinions and perceptions of patients as well as quality of life data to reflect the influence of telemedicine and interprofessional intervention.

A further weakness lies in the fact that only a historical control group from the time before the introduction of TeDia could be used (2010). However, our study approach bases on real-world data which we tried to examine with this proof-of-principle study. At least the comparison of the average length of hospital stay between patients with or without diabetes might suggest a potential benefit of TeDia. Furthermore, the overall findings of our study indicate to be of clinical significance; particularly in regard to reducing or even preventing complications in the further course. Therefore, performing statistical analyses seem to be irrelevant, especially as this is a cross-sectional analysis as well as a proof-of-principle study. On the other hand, another study could show that an innovative diabetes-specific structure and process management, comparable to TeDia, improves clinical awareness for diabetes and increases revenues.37 Therefore, we assume that the findings of our study could be reproduced in any other inpatient setting. A possible source of error in this kind of study could be a selection bias, however, as described in detail in the method section, every patient with a potential impaired glucose level was confirmed with an HbA1c determination.

A major strength of the study is that we investigated the impact of TeDia in three different hospitals with a large cohort of diabetes patients in an inpatient setting. In the present study the diabetes prevalence with 16% lies above the general diabetes prevalence rate.38 The TeDia system was able to improve inpatient diabetes care, despite a limited number of diabetologists and specialized nurses. While the beneficial effect of telemedicine for diabetes treatment in different settings is already known,3941 the present study shows, that a telemedicine-based system combined with an interprofessional teamwork approach can be successfully implemented in an inpatient setting.


The results of the investigated TeDia system indicate a beneficial effect of an interprofessional and telemedicine-based approach. The implementation of TeDia led to an improved care quality, which was ensured by qualified physicians and specially trained nurses. Moreover, our findings emphasize the necessity of novel technologies in an inpatient setting by improving efficacy, safety and efficiency of diabetes care. Rapid analyzes of clinical and laboratory data accelerate clinical decision-making and therapy adjustments in the hospital setting and improve inpatient diabetes care.


G-DRG, German diagnosis-related group; HbA1c, hemoglobin A1c; TeDia, Telemedical Diabetology.

Ethics Statement

Approval of the research protocol was obtained from the ethics committee of the Medical Council North Rhine (Ärztekammer Nordrhein No. 2011294). No human or animal data were collected, only routine data were used.

Availability of Data and Materials

The data used to support the findings of this study are available from the corresponding author upon request.


We thank Yasemin Kempf for proofreading the paper.

Author Contributions

All authors contributed to data analysis, drafting or revising the article, gave final approval of the version to be published, and agree to be accountable for all aspects of the work.


Dr Kerstin Kempf reports personal fees from Verlag Kirchheim GmbH & Co. KG, outside the submitted work; Prof. Dr. Stephan Martin reports grants from Sanofi Aventis, during the conduct of the study. The authors report no other conflicts of interest in this work.


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